Regression in RCU subsystem in latest mainline kernel

Regression in RCU subsystem in latest mainline kernel

[Rojhalat Ibrahim]

Hi,

the current mainline kernel from git reproducibly hangs on my Freescale 
PowerPC P5020DS development system. Most of the time the hang occurs during 
boot (kernel just stops booting, system hangs), sometimes shortly after 
booting (system hangs, no message). Very often booting stops at the 
initialization of the Intel PRO 1000 PCIe network device (e1000e).

I used git bisect and arrived at this commit:

016a8d5be6ddcc72ef0432d82d9f6fa34f61b907
rcu: Don't call wakeup() with rcu_node structure ->lock held

With versions before that commit the system runs normally.

   Rojhalat

Re: Regression in RCU subsystem in latest mainline kernel

[Paul E. McKenney]

On Fri, Jun 14, 2013 at 01:47:00PM +0200, Rojhalat Ibrahim wrote:
> Hi,
> 
> the current mainline kernel from git reproducibly hangs on my Freescale 
> PowerPC P5020DS development system. Most of the time the hang occurs during 
> boot (kernel just stops booting, system hangs), sometimes shortly after 
> booting (system hangs, no message). Very often booting stops at the 
> initialization of the Intel PRO 1000 PCIe network device (e1000e).
> 
> I used git bisect and arrived at this commit:
> 
> 016a8d5be6ddcc72ef0432d82d9f6fa34f61b907
> rcu: Don't call wakeup() with rcu_node structure ->lock held
> 
> With versions before that commit the system runs normally.

Odd, given that this fix was intended to prevent hangs.  Could you
please send your .config?

							Thanx, Paul

Re: Regression in RCU subsystem in latest mainline kernel

[Rojhalat Ibrahim]

On Friday 14 June 2013 05:28:00 Paul E. McKenney wrote:
> On Fri, Jun 14, 2013 at 01:47:00PM +0200, Rojhalat Ibrahim wrote:
> > Hi,
> > 
> > the current mainline kernel from git reproducibly hangs on my Freescale
> > PowerPC P5020DS development system. Most of the time the hang occurs
> > during
> > boot (kernel just stops booting, system hangs), sometimes shortly after
> > booting (system hangs, no message). Very often booting stops at the
> > initialization of the Intel PRO 1000 PCIe network device (e1000e).
> > 
> > I used git bisect and arrived at this commit:
> > 
> > 016a8d5be6ddcc72ef0432d82d9f6fa34f61b907
> > rcu: Don't call wakeup() with rcu_node structure ->lock held
> > 
> > With versions before that commit the system runs normally.
> 
> Odd, given that this fix was intended to prevent hangs.  Could you
> please send your .config?
> 
> 							Thanx, Paul

#
# Automatically generated file; DO NOT EDIT.
# Linux/powerpc 3.10.0-rc5 Kernel Configuration
#
CONFIG_PPC64=y

#
# Processor support
#
# CONFIG_PPC_BOOK3S_64 is not set
CONFIG_PPC_BOOK3E_64=y
CONFIG_GENERIC_CPU=y
# CONFIG_CELL_CPU is not set
# CONFIG_POWER4_CPU is not set
# CONFIG_POWER5_CPU is not set
# CONFIG_POWER6_CPU is not set
# CONFIG_POWER7_CPU is not set
CONFIG_PPC_BOOK3E=y
CONFIG_PPC_A2=y
CONFIG_E500=y
CONFIG_PPC_E500MC=y
CONFIG_PPC_FPU=y
CONFIG_FSL_EMB_PERFMON=y
CONFIG_FSL_EMB_PERF_EVENT=y
CONFIG_FSL_EMB_PERF_EVENT_E500=y
CONFIG_BOOKE=y
CONFIG_PPC_FSL_BOOK3E=y
CONFIG_PTE_64BIT=y
CONFIG_PHYS_64BIT=y
# CONFIG_ALTIVEC is not set
CONFIG_PPC_ICSWX=y
# CONFIG_PPC_ICSWX_USE_SIGILL is not set
CONFIG_PPC_MMU_NOHASH=y
CONFIG_PPC_BOOK3E_MMU=y
# CONFIG_PPC_MM_SLICES is not set
CONFIG_SMP=y
CONFIG_NR_CPUS=2
CONFIG_PPC_DOORBELL=y
CONFIG_64BIT=y
CONFIG_WORD_SIZE=64
CONFIG_ARCH_PHYS_ADDR_T_64BIT=y
CONFIG_ARCH_DMA_ADDR_T_64BIT=y
CONFIG_MMU=y
CONFIG_HAVE_SETUP_PER_CPU_AREA=y
CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK=y
CONFIG_NR_IRQS=512
CONFIG_STACKTRACE_SUPPORT=y
CONFIG_HAVE_LATENCYTOP_SUPPORT=y
CONFIG_TRACE_IRQFLAGS_SUPPORT=y
CONFIG_LOCKDEP_SUPPORT=y
CONFIG_RWSEM_XCHGADD_ALGORITHM=y
CONFIG_ARCH_HAS_ILOG2_U32=y
CONFIG_ARCH_HAS_ILOG2_U64=y
CONFIG_GENERIC_HWEIGHT=y
CONFIG_PPC=y
CONFIG_EARLY_PRINTK=y
CONFIG_COMPAT=y
CONFIG_SYSVIPC_COMPAT=y
CONFIG_SCHED_OMIT_FRAME_POINTER=y
CONFIG_ARCH_MAY_HAVE_PC_FDC=y
CONFIG_PPC_OF=y
CONFIG_PPC_UDBG_16550=y
CONFIG_GENERIC_TBSYNC=y
CONFIG_AUDIT_ARCH=y
CONFIG_GENERIC_BUG=y
CONFIG_EPAPR_BOOT=y
CONFIG_DEFAULT_UIMAGE=y
CONFIG_ARCH_HIBERNATION_POSSIBLE=y
# CONFIG_PPC_DCR_NATIVE is not set
# CONFIG_PPC_DCR_MMIO is not set
# CONFIG_PPC_OF_PLATFORM_PCI is not set
CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC=y
CONFIG_ARCH_SUPPORTS_UPROBES=y
CONFIG_PPC_ADV_DEBUG_REGS=y
CONFIG_PPC_ADV_DEBUG_IACS=2
CONFIG_PPC_ADV_DEBUG_DACS=2
CONFIG_PPC_ADV_DEBUG_DVCS=0
CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config"
CONFIG_IRQ_WORK=y

#
# General setup
#
CONFIG_INIT_ENV_ARG_LIMIT=32
CONFIG_CROSS_COMPILE="powerpc64-e500mc64-linux-gnu-"
CONFIG_LOCALVERSION=""
CONFIG_LOCALVERSION_AUTO=y
CONFIG_DEFAULT_HOSTNAME="(none)"
# CONFIG_SWAP is not set
CONFIG_SYSVIPC=y
CONFIG_SYSVIPC_SYSCTL=y
CONFIG_POSIX_MQUEUE=y
CONFIG_POSIX_MQUEUE_SYSCTL=y
# CONFIG_FHANDLE is not set
# CONFIG_AUDIT is not set
CONFIG_HAVE_GENERIC_HARDIRQS=y

#
# IRQ subsystem
#
CONFIG_GENERIC_HARDIRQS=y
CONFIG_GENERIC_IRQ_SHOW=y
CONFIG_GENERIC_IRQ_SHOW_LEVEL=y
CONFIG_IRQ_DOMAIN=y
CONFIG_IRQ_DOMAIN_DEBUG=y
CONFIG_IRQ_FORCED_THREADING=y
CONFIG_SPARSE_IRQ=y
CONFIG_GENERIC_TIME_VSYSCALL_OLD=y
CONFIG_GENERIC_CLOCKEVENTS=y
CONFIG_GENERIC_CLOCKEVENTS_BUILD=y
CONFIG_GENERIC_CMOS_UPDATE=y

#
# Timers subsystem
#
CONFIG_TICK_ONESHOT=y
CONFIG_NO_HZ_COMMON=y
# CONFIG_HZ_PERIODIC is not set
CONFIG_NO_HZ_IDLE=y
CONFIG_NO_HZ=y
CONFIG_HIGH_RES_TIMERS=y

#
# CPU/Task time and stats accounting
#
CONFIG_VIRT_CPU_ACCOUNTING=y
# CONFIG_TICK_CPU_ACCOUNTING is not set
CONFIG_VIRT_CPU_ACCOUNTING_NATIVE=y
CONFIG_BSD_PROCESS_ACCT=y
# CONFIG_BSD_PROCESS_ACCT_V3 is not set
# CONFIG_TASKSTATS is not set

#
# RCU Subsystem
#
CONFIG_TREE_RCU=y
# CONFIG_PREEMPT_RCU is not set
CONFIG_RCU_STALL_COMMON=y
CONFIG_RCU_FANOUT=64
CONFIG_RCU_FANOUT_LEAF=16
# CONFIG_RCU_FANOUT_EXACT is not set
# CONFIG_RCU_FAST_NO_HZ is not set
# CONFIG_TREE_RCU_TRACE is not set
# CONFIG_RCU_NOCB_CPU is not set
CONFIG_IKCONFIG=y
CONFIG_IKCONFIG_PROC=y
CONFIG_LOG_BUF_SHIFT=14
# CONFIG_CGROUPS is not set
# CONFIG_CHECKPOINT_RESTORE is not set
# CONFIG_NAMESPACES is not set
CONFIG_UIDGID_CONVERTED=y
# CONFIG_UIDGID_STRICT_TYPE_CHECKS is not set
# CONFIG_SCHED_AUTOGROUP is not set
# CONFIG_SYSFS_DEPRECATED is not set
# CONFIG_RELAY is not set
CONFIG_BLK_DEV_INITRD=y
CONFIG_INITRAMFS_SOURCE=""
CONFIG_RD_GZIP=y
# CONFIG_RD_BZIP2 is not set
# CONFIG_RD_LZMA is not set
# CONFIG_RD_XZ is not set
# CONFIG_RD_LZO is not set
# CONFIG_CC_OPTIMIZE_FOR_SIZE is not set
CONFIG_SYSCTL=y
CONFIG_ANON_INODES=y
CONFIG_SYSCTL_EXCEPTION_TRACE=y
CONFIG_HOTPLUG=y
CONFIG_EXPERT=y
# CONFIG_SYSCTL_SYSCALL is not set
CONFIG_KALLSYMS=y
# CONFIG_KALLSYMS_ALL is not set
CONFIG_PRINTK=y
CONFIG_BUG=y
CONFIG_ELF_CORE=y
CONFIG_BASE_FULL=y
CONFIG_FUTEX=y
CONFIG_EPOLL=y
CONFIG_SIGNALFD=y
CONFIG_TIMERFD=y
CONFIG_EVENTFD=y
CONFIG_SHMEM=y
CONFIG_AIO=y
CONFIG_PCI_QUIRKS=y
CONFIG_EMBEDDED=y
CONFIG_HAVE_PERF_EVENTS=y

#
# Kernel Performance Events And Counters
#
CONFIG_PERF_EVENTS=y
# CONFIG_DEBUG_PERF_USE_VMALLOC is not set
CONFIG_VM_EVENT_COUNTERS=y
CONFIG_SLUB_DEBUG=y
CONFIG_COMPAT_BRK=y
# CONFIG_SLAB is not set
CONFIG_SLUB=y
# CONFIG_SLOB is not set
# CONFIG_PROFILING is not set
CONFIG_HAVE_OPROFILE=y
# CONFIG_KPROBES is not set
# CONFIG_JUMP_LABEL is not set
# CONFIG_HAVE_64BIT_ALIGNED_ACCESS is not set
CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS=y
CONFIG_ARCH_USE_BUILTIN_BSWAP=y
CONFIG_HAVE_IOREMAP_PROT=y
CONFIG_HAVE_KPROBES=y
CONFIG_HAVE_KRETPROBES=y
CONFIG_HAVE_ARCH_TRACEHOOK=y
CONFIG_HAVE_DMA_ATTRS=y
CONFIG_USE_GENERIC_SMP_HELPERS=y
CONFIG_GENERIC_SMP_IDLE_THREAD=y
CONFIG_HAVE_REGS_AND_STACK_ACCESS_API=y
CONFIG_HAVE_DMA_API_DEBUG=y
CONFIG_HAVE_ARCH_JUMP_LABEL=y
CONFIG_HAVE_RCU_TABLE_FREE=y
CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG=y
CONFIG_ARCH_WANT_IPC_PARSE_VERSION=y
CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION=y
CONFIG_ARCH_WANT_OLD_COMPAT_IPC=y
CONFIG_HAVE_VIRT_CPU_ACCOUNTING=y
CONFIG_HAVE_MOD_ARCH_SPECIFIC=y
CONFIG_MODULES_USE_ELF_RELA=y
CONFIG_CLONE_BACKWARDS=y
CONFIG_OLD_SIGSUSPEND=y
CONFIG_COMPAT_OLD_SIGACTION=y

#
# GCOV-based kernel profiling
#
# CONFIG_GCOV_KERNEL is not set
# CONFIG_HAVE_GENERIC_DMA_COHERENT is not set
CONFIG_SLABINFO=y
CONFIG_RT_MUTEXES=y
CONFIG_BASE_SMALL=0
CONFIG_MODULES=y
# CONFIG_MODULE_FORCE_LOAD is not set
CONFIG_MODULE_UNLOAD=y
CONFIG_MODULE_FORCE_UNLOAD=y
CONFIG_MODVERSIONS=y
# CONFIG_MODULE_SRCVERSION_ALL is not set
# CONFIG_MODULE_SIG is not set
CONFIG_STOP_MACHINE=y
CONFIG_BLOCK=y
# CONFIG_BLK_DEV_BSG is not set
# CONFIG_BLK_DEV_BSGLIB is not set
# CONFIG_BLK_DEV_INTEGRITY is not set

#
# Partition Types
#
CONFIG_PARTITION_ADVANCED=y
# CONFIG_ACORN_PARTITION is not set
# CONFIG_OSF_PARTITION is not set
# CONFIG_AMIGA_PARTITION is not set
# CONFIG_ATARI_PARTITION is not set
CONFIG_MAC_PARTITION=y
CONFIG_MSDOS_PARTITION=y
# CONFIG_BSD_DISKLABEL is not set
# CONFIG_MINIX_SUBPARTITION is not set
# CONFIG_SOLARIS_X86_PARTITION is not set
# CONFIG_UNIXWARE_DISKLABEL is not set
# CONFIG_LDM_PARTITION is not set
# CONFIG_SGI_PARTITION is not set
# CONFIG_ULTRIX_PARTITION is not set
# CONFIG_SUN_PARTITION is not set
# CONFIG_KARMA_PARTITION is not set
CONFIG_EFI_PARTITION=y
# CONFIG_SYSV68_PARTITION is not set
CONFIG_BLOCK_COMPAT=y

#
# IO Schedulers
#
CONFIG_IOSCHED_NOOP=y
CONFIG_IOSCHED_DEADLINE=y
CONFIG_IOSCHED_CFQ=y
# CONFIG_DEFAULT_DEADLINE is not set
CONFIG_DEFAULT_CFQ=y
# CONFIG_DEFAULT_NOOP is not set
CONFIG_DEFAULT_IOSCHED="cfq"
CONFIG_INLINE_SPIN_UNLOCK_IRQ=y
CONFIG_INLINE_READ_UNLOCK=y
CONFIG_INLINE_READ_UNLOCK_IRQ=y
CONFIG_INLINE_WRITE_UNLOCK=y
CONFIG_INLINE_WRITE_UNLOCK_IRQ=y
CONFIG_MUTEX_SPIN_ON_OWNER=y
# CONFIG_FREEZER is not set
CONFIG_PPC_MSI_BITMAP=y
CONFIG_PPC_XICS=y
CONFIG_PPC_ICP_NATIVE=y
# CONFIG_PPC_ICP_HV is not set
# CONFIG_PPC_ICS_RTAS is not set
CONFIG_PPC_SCOM=y
# CONFIG_SCOM_DEBUGFS is not set
# CONFIG_GE_FPGA is not set

#
# Platform support
#
CONFIG_POWERNV_MSI=y
# CONFIG_PPC_CELL is not set
# CONFIG_PPC_CELL_NATIVE is not set
# CONFIG_PQ2ADS is not set
CONFIG_FSL_SOC_BOOKE=y
CONFIG_P5020_DS=y
# CONFIG_P5040_DS is not set
# CONFIG_PPC_QEMU_E500 is not set
# CONFIG_T4240_QDS is not set
# CONFIG_B4_QDS is not set
CONFIG_PPC_WSP=y

#
# WSP platform selection
#
CONFIG_PPC_PSR2=y
# CONFIG_PPC_CHROMA is not set
# CONFIG_KVM_GUEST is not set
CONFIG_EPAPR_PARAVIRT=y
# CONFIG_PPC_OF_BOOT_TRAMPOLINE is not set
CONFIG_PPC_SMP_MUXED_IPI=y
# CONFIG_IPIC is not set
CONFIG_MPIC=y
CONFIG_PPC_EPAPR_HV_PIC=y
# CONFIG_MPIC_WEIRD is not set
# CONFIG_MPIC_MSGR is not set
# CONFIG_PPC_I8259 is not set
# CONFIG_U3_DART is not set
# CONFIG_PPC_RTAS is not set
# CONFIG_MMIO_NVRAM is not set
# CONFIG_MPIC_U3_HT_IRQS is not set
# CONFIG_PPC_MPC106 is not set
# CONFIG_PPC_970_NAP is not set
# CONFIG_PPC_P7_NAP is not set
CONFIG_PPC_INDIRECT_IO=y
CONFIG_PPC_INDIRECT_PIO=y
CONFIG_PPC_IO_WORKAROUNDS=y

#
# CPU Frequency scaling
#
# CONFIG_CPU_FREQ is not set

#
# CPUIdle driver
#
# CONFIG_CPU_IDLE is not set
# CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED is not set
# CONFIG_FSL_ULI1575 is not set
# CONFIG_SIMPLE_GPIO is not set

#
# Kernel options
#
# CONFIG_HZ_100 is not set
CONFIG_HZ_250=y
# CONFIG_HZ_300 is not set
# CONFIG_HZ_1000 is not set
CONFIG_HZ=250
CONFIG_SCHED_HRTICK=y
CONFIG_PREEMPT_NONE=y
# CONFIG_PREEMPT_VOLUNTARY is not set
# CONFIG_PREEMPT is not set
CONFIG_BINFMT_ELF=y
CONFIG_COMPAT_BINFMT_ELF=y
# CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
CONFIG_BINFMT_SCRIPT=y
# CONFIG_HAVE_AOUT is not set
# CONFIG_BINFMT_MISC is not set
CONFIG_COREDUMP=y
CONFIG_HUGETLB_PAGE_SIZE_VARIABLE=y
# CONFIG_MATH_EMULATION is not set
CONFIG_IOMMU_HELPER=y
CONFIG_SWIOTLB=y
CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y
CONFIG_ARCH_HAS_WALK_MEMORY=y
CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE=y
# CONFIG_CRASH_DUMP is not set
CONFIG_IRQ_ALL_CPUS=y
# CONFIG_NUMA is not set
CONFIG_ARCH_SELECT_MEMORY_MODEL=y
CONFIG_ARCH_FLATMEM_ENABLE=y
CONFIG_ARCH_SPARSEMEM_ENABLE=y
CONFIG_SYS_SUPPORTS_HUGETLBFS=y
CONFIG_SELECT_MEMORY_MODEL=y
CONFIG_FLATMEM_MANUAL=y
# CONFIG_SPARSEMEM_MANUAL is not set
CONFIG_FLATMEM=y
CONFIG_FLAT_NODE_MEM_MAP=y
CONFIG_SPARSEMEM_VMEMMAP_ENABLE=y
CONFIG_HAVE_MEMBLOCK=y
CONFIG_HAVE_MEMBLOCK_NODE_MAP=y
# CONFIG_HAVE_BOOTMEM_INFO_NODE is not set
CONFIG_PAGEFLAGS_EXTENDED=y
CONFIG_SPLIT_PTLOCK_CPUS=4
# CONFIG_COMPACTION is not set
CONFIG_MIGRATION=y
CONFIG_PHYS_ADDR_T_64BIT=y
CONFIG_ZONE_DMA_FLAG=1
CONFIG_BOUNCE=y
# CONFIG_KSM is not set
CONFIG_DEFAULT_MMAP_MIN_ADDR=4096
# CONFIG_CROSS_MEMORY_ATTACH is not set
# CONFIG_CLEANCACHE is not set
# CONFIG_PPC_HAS_HASH_64K is not set
CONFIG_PPC_4K_PAGES=y
# CONFIG_PPC_64K_PAGES is not set
CONFIG_FORCE_MAX_ZONEORDER=13
# CONFIG_SCHED_SMT is not set
# CONFIG_CMDLINE_BOOL is not set
CONFIG_EXTRA_TARGETS=""
# CONFIG_PM_RUNTIME is not set
CONFIG_SECCOMP=y
CONFIG_ISA_DMA_API=y

#
# Bus options
#
CONFIG_ZONE_DMA=y
CONFIG_NEED_DMA_MAP_STATE=y
CONFIG_NEED_SG_DMA_LENGTH=y
CONFIG_GENERIC_ISA_DMA=y
CONFIG_PPC_INDIRECT_PCI=y
CONFIG_FSL_SOC=y
CONFIG_FSL_PCI=y
CONFIG_FSL_LBC=y
CONFIG_FSL_IFC=y
CONFIG_PPC_PCI_CHOICE=y
CONFIG_PCI=y
CONFIG_PCI_DOMAINS=y
CONFIG_PCI_SYSCALL=y
CONFIG_PCIEPORTBUS=y
CONFIG_HOTPLUG_PCI_PCIE=y
CONFIG_PCIEAER=y
# CONFIG_PCIE_ECRC is not set
# CONFIG_PCIEAER_INJECT is not set
# CONFIG_PCIEASPM is not set
CONFIG_ARCH_SUPPORTS_MSI=y
CONFIG_PCI_MSI=y
CONFIG_PCI_DEBUG=y
# CONFIG_PCI_REALLOC_ENABLE_AUTO is not set
# CONFIG_PCI_STUB is not set
# CONFIG_PCI_IOV is not set
# CONFIG_PCI_PRI is not set
# CONFIG_PCI_PASID is not set
# CONFIG_PCCARD is not set
CONFIG_HOTPLUG_PCI=y
# CONFIG_HOTPLUG_PCI_CPCI is not set
# CONFIG_HOTPLUG_PCI_SHPC is not set
CONFIG_HAS_RAPIDIO=y
# CONFIG_RAPIDIO is not set
# CONFIG_NONSTATIC_KERNEL is not set
# CONFIG_RELOCATABLE is not set
CONFIG_PAGE_OFFSET=0xc000000000000000
CONFIG_KERNEL_START=0xc000000000000000
CONFIG_PHYSICAL_START=0x00000000
CONFIG_NET=y

#
# Networking options
#
CONFIG_PACKET=y
# CONFIG_PACKET_DIAG is not set
CONFIG_UNIX=y
# CONFIG_UNIX_DIAG is not set
CONFIG_XFRM=y
CONFIG_XFRM_ALGO=y
CONFIG_XFRM_USER=y
CONFIG_XFRM_SUB_POLICY=y
CONFIG_XFRM_MIGRATE=y
CONFIG_XFRM_STATISTICS=y
CONFIG_NET_KEY=y
CONFIG_NET_KEY_MIGRATE=y
CONFIG_INET=y
CONFIG_IP_MULTICAST=y
CONFIG_IP_ADVANCED_ROUTER=y
# CONFIG_IP_FIB_TRIE_STATS is not set
CONFIG_IP_MULTIPLE_TABLES=y
CONFIG_IP_ROUTE_MULTIPATH=y
CONFIG_IP_ROUTE_VERBOSE=y
CONFIG_IP_PNP=y
CONFIG_IP_PNP_DHCP=y
CONFIG_IP_PNP_BOOTP=y
CONFIG_IP_PNP_RARP=y
CONFIG_NET_IPIP=y
# CONFIG_NET_IPGRE_DEMUX is not set
CONFIG_NET_IP_TUNNEL=y
CONFIG_IP_MROUTE=y
# CONFIG_IP_MROUTE_MULTIPLE_TABLES is not set
CONFIG_IP_PIMSM_V1=y
CONFIG_IP_PIMSM_V2=y
CONFIG_ARPD=y
# CONFIG_SYN_COOKIES is not set
# CONFIG_NET_IPVTI is not set
# CONFIG_INET_AH is not set
CONFIG_INET_ESP=y
# CONFIG_INET_IPCOMP is not set
# CONFIG_INET_XFRM_TUNNEL is not set
CONFIG_INET_TUNNEL=y
CONFIG_INET_XFRM_MODE_TRANSPORT=y
CONFIG_INET_XFRM_MODE_TUNNEL=y
# CONFIG_INET_XFRM_MODE_BEET is not set
# CONFIG_INET_LRO is not set
CONFIG_INET_DIAG=y
CONFIG_INET_TCP_DIAG=y
# CONFIG_INET_UDP_DIAG is not set
# CONFIG_TCP_CONG_ADVANCED is not set
CONFIG_TCP_CONG_CUBIC=y
CONFIG_DEFAULT_TCP_CONG="cubic"
# CONFIG_TCP_MD5SIG is not set
# CONFIG_IPV6 is not set
# CONFIG_NETWORK_SECMARK is not set
# CONFIG_NETWORK_PHY_TIMESTAMPING is not set
# CONFIG_NETFILTER is not set
# CONFIG_IP_DCCP is not set
# CONFIG_IP_SCTP is not set
# CONFIG_RDS is not set
# CONFIG_TIPC is not set
# CONFIG_ATM is not set
# CONFIG_L2TP is not set
# CONFIG_BRIDGE is not set
CONFIG_HAVE_NET_DSA=y
# CONFIG_VLAN_8021Q is not set
# CONFIG_DECNET is not set
# CONFIG_LLC2 is not set
# CONFIG_IPX is not set
# CONFIG_ATALK is not set
# CONFIG_X25 is not set
# CONFIG_LAPB is not set
# CONFIG_PHONET is not set
# CONFIG_IEEE802154 is not set
# CONFIG_NET_SCHED is not set
# CONFIG_DCB is not set
CONFIG_DNS_RESOLVER=y
# CONFIG_BATMAN_ADV is not set
# CONFIG_OPENVSWITCH is not set
# CONFIG_VSOCKETS is not set
# CONFIG_NETLINK_MMAP is not set
# CONFIG_NETLINK_DIAG is not set
CONFIG_RPS=y
CONFIG_RFS_ACCEL=y
CONFIG_XPS=y
CONFIG_BQL=y
# CONFIG_BPF_JIT is not set

#
# Network testing
#
# CONFIG_NET_PKTGEN is not set
# CONFIG_HAMRADIO is not set
# CONFIG_CAN is not set
# CONFIG_IRDA is not set
# CONFIG_BT is not set
# CONFIG_AF_RXRPC is not set
CONFIG_FIB_RULES=y
# CONFIG_WIRELESS is not set
# CONFIG_WIMAX is not set
# CONFIG_RFKILL is not set
# CONFIG_NET_9P is not set
# CONFIG_CAIF is not set
# CONFIG_CEPH_LIB is not set
# CONFIG_NFC is not set
CONFIG_HAVE_BPF_JIT=y

#
# Device Drivers
#

#
# Generic Driver Options
#
CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
CONFIG_DEVTMPFS=y
# CONFIG_DEVTMPFS_MOUNT is not set
CONFIG_STANDALONE=y
CONFIG_PREVENT_FIRMWARE_BUILD=y
CONFIG_FW_LOADER=y
CONFIG_FIRMWARE_IN_KERNEL=y
CONFIG_EXTRA_FIRMWARE=""
CONFIG_FW_LOADER_USER_HELPER=y
# CONFIG_DEBUG_DRIVER is not set
# CONFIG_DEBUG_DEVRES is not set
# CONFIG_SYS_HYPERVISOR is not set
# CONFIG_GENERIC_CPU_DEVICES is not set
# CONFIG_DMA_SHARED_BUFFER is not set

#
# Bus devices
#
# CONFIG_CONNECTOR is not set
CONFIG_MTD=y
# CONFIG_MTD_TESTS is not set
# CONFIG_MTD_REDBOOT_PARTS is not set
CONFIG_MTD_CMDLINE_PARTS=y
CONFIG_MTD_OF_PARTS=y
# CONFIG_MTD_AR7_PARTS is not set

#
# User Modules And Translation Layers
#
CONFIG_MTD_BLKDEVS=y
CONFIG_MTD_BLOCK=y
# CONFIG_FTL is not set
# CONFIG_NFTL is not set
# CONFIG_INFTL is not set
# CONFIG_RFD_FTL is not set
# CONFIG_SSFDC is not set
# CONFIG_SM_FTL is not set
# CONFIG_MTD_OOPS is not set

#
# RAM/ROM/Flash chip drivers
#
CONFIG_MTD_CFI=y
# CONFIG_MTD_JEDECPROBE is not set
CONFIG_MTD_GEN_PROBE=y
# CONFIG_MTD_CFI_ADV_OPTIONS is not set
CONFIG_MTD_MAP_BANK_WIDTH_1=y
CONFIG_MTD_MAP_BANK_WIDTH_2=y
CONFIG_MTD_MAP_BANK_WIDTH_4=y
# CONFIG_MTD_MAP_BANK_WIDTH_8 is not set
# CONFIG_MTD_MAP_BANK_WIDTH_16 is not set
# CONFIG_MTD_MAP_BANK_WIDTH_32 is not set
CONFIG_MTD_CFI_I1=y
CONFIG_MTD_CFI_I2=y
# CONFIG_MTD_CFI_I4 is not set
# CONFIG_MTD_CFI_I8 is not set
# CONFIG_MTD_CFI_INTELEXT is not set
CONFIG_MTD_CFI_AMDSTD=y
# CONFIG_MTD_CFI_STAA is not set
CONFIG_MTD_CFI_UTIL=y
# CONFIG_MTD_RAM is not set
# CONFIG_MTD_ROM is not set
# CONFIG_MTD_ABSENT is not set

#
# Mapping drivers for chip access
#
# CONFIG_MTD_COMPLEX_MAPPINGS is not set
# CONFIG_MTD_PHYSMAP is not set
CONFIG_MTD_PHYSMAP_OF=y
# CONFIG_MTD_INTEL_VR_NOR is not set
# CONFIG_MTD_PLATRAM is not set

#
# Self-contained MTD device drivers
#
# CONFIG_MTD_PMC551 is not set
# CONFIG_MTD_DATAFLASH is not set
CONFIG_MTD_M25P80=y
CONFIG_M25PXX_USE_FAST_READ=y
# CONFIG_MTD_SST25L is not set
# CONFIG_MTD_SLRAM is not set
# CONFIG_MTD_PHRAM is not set
# CONFIG_MTD_MTDRAM is not set
# CONFIG_MTD_BLOCK2MTD is not set

#
# Disk-On-Chip Device Drivers
#
# CONFIG_MTD_DOCG3 is not set
CONFIG_MTD_NAND_ECC=y
# CONFIG_MTD_NAND_ECC_SMC is not set
CONFIG_MTD_NAND=y
# CONFIG_MTD_NAND_ECC_BCH is not set
# CONFIG_MTD_SM_COMMON is not set
# CONFIG_MTD_NAND_DENALI is not set
CONFIG_MTD_NAND_IDS=y
# CONFIG_MTD_NAND_RICOH is not set
# CONFIG_MTD_NAND_DISKONCHIP is not set
# CONFIG_MTD_NAND_DOCG4 is not set
# CONFIG_MTD_NAND_CAFE is not set
# CONFIG_MTD_NAND_NANDSIM is not set
# CONFIG_MTD_NAND_PLATFORM is not set
# CONFIG_MTD_ALAUDA is not set
CONFIG_MTD_NAND_FSL_ELBC=y
CONFIG_MTD_NAND_FSL_IFC=y
# CONFIG_MTD_ONENAND is not set

#
# LPDDR flash memory drivers
#
# CONFIG_MTD_LPDDR is not set
# CONFIG_MTD_UBI is not set
CONFIG_DTC=y
CONFIG_OF=y

#
# Device Tree and Open Firmware support
#
CONFIG_PROC_DEVICETREE=y
CONFIG_OF_SELFTEST=y
CONFIG_OF_FLATTREE=y
CONFIG_OF_EARLY_FLATTREE=y
CONFIG_OF_ADDRESS=y
CONFIG_OF_IRQ=y
CONFIG_OF_DEVICE=y
CONFIG_OF_I2C=y
CONFIG_OF_NET=y
CONFIG_OF_MDIO=y
CONFIG_OF_PCI=y
CONFIG_OF_PCI_IRQ=y
CONFIG_OF_MTD=y
# CONFIG_PARPORT is not set
CONFIG_BLK_DEV=y
# CONFIG_BLK_DEV_FD is not set
# CONFIG_BLK_DEV_PCIESSD_MTIP32XX is not set
# CONFIG_BLK_CPQ_CISS_DA is not set
# CONFIG_BLK_DEV_DAC960 is not set
# CONFIG_BLK_DEV_UMEM is not set
# CONFIG_BLK_DEV_COW_COMMON is not set
CONFIG_BLK_DEV_LOOP=y
CONFIG_BLK_DEV_LOOP_MIN_COUNT=8
# CONFIG_BLK_DEV_CRYPTOLOOP is not set
# CONFIG_BLK_DEV_DRBD is not set
# CONFIG_BLK_DEV_NBD is not set
# CONFIG_BLK_DEV_NVME is not set
# CONFIG_BLK_DEV_SX8 is not set
CONFIG_BLK_DEV_RAM=y
CONFIG_BLK_DEV_RAM_COUNT=16
CONFIG_BLK_DEV_RAM_SIZE=131072
# CONFIG_BLK_DEV_XIP is not set
# CONFIG_CDROM_PKTCDVD is not set
# CONFIG_ATA_OVER_ETH is not set
# CONFIG_BLK_DEV_HD is not set
# CONFIG_BLK_DEV_RBD is not set
# CONFIG_BLK_DEV_RSXX is not set

#
# Misc devices
#
# CONFIG_SENSORS_LIS3LV02D is not set
# CONFIG_AD525X_DPOT is not set
# CONFIG_DUMMY_IRQ is not set
# CONFIG_PHANTOM is not set
# CONFIG_INTEL_MID_PTI is not set
# CONFIG_SGI_IOC4 is not set
# CONFIG_TIFM_CORE is not set
# CONFIG_ICS932S401 is not set
# CONFIG_ATMEL_SSC is not set
# CONFIG_ENCLOSURE_SERVICES is not set
# CONFIG_HP_ILO is not set
# CONFIG_APDS9802ALS is not set
# CONFIG_ISL29003 is not set
# CONFIG_ISL29020 is not set
# CONFIG_SENSORS_TSL2550 is not set
# CONFIG_SENSORS_BH1780 is not set
# CONFIG_SENSORS_BH1770 is not set
# CONFIG_SENSORS_APDS990X is not set
# CONFIG_HMC6352 is not set
# CONFIG_DS1682 is not set
# CONFIG_TI_DAC7512 is not set
# CONFIG_BMP085_I2C is not set
# CONFIG_BMP085_SPI is not set
# CONFIG_PCH_PHUB is not set
# CONFIG_USB_SWITCH_FSA9480 is not set
# CONFIG_LATTICE_ECP3_CONFIG is not set
# CONFIG_SRAM is not set
# CONFIG_C2PORT is not set

#
# EEPROM support
#
# CONFIG_EEPROM_AT24 is not set
# CONFIG_EEPROM_AT25 is not set
CONFIG_EEPROM_LEGACY=y
# CONFIG_EEPROM_MAX6875 is not set
# CONFIG_EEPROM_93CX6 is not set
# CONFIG_EEPROM_93XX46 is not set
# CONFIG_CB710_CORE is not set

#
# Texas Instruments shared transport line discipline
#
# CONFIG_TI_ST is not set
# CONFIG_SENSORS_LIS3_SPI is not set
# CONFIG_SENSORS_LIS3_I2C is not set

#
# Altera FPGA firmware download module
#
# CONFIG_ALTERA_STAPL is not set
CONFIG_HAVE_IDE=y
# CONFIG_IDE is not set

#
# SCSI device support
#
CONFIG_SCSI_MOD=y
# CONFIG_RAID_ATTRS is not set
CONFIG_SCSI=y
CONFIG_SCSI_DMA=y
# CONFIG_SCSI_TGT is not set
# CONFIG_SCSI_NETLINK is not set
CONFIG_SCSI_PROC_FS=y

#
# SCSI support type (disk, tape, CD-ROM)
#
CONFIG_BLK_DEV_SD=y
# CONFIG_CHR_DEV_ST is not set
# CONFIG_CHR_DEV_OSST is not set
CONFIG_BLK_DEV_SR=y
# CONFIG_BLK_DEV_SR_VENDOR is not set
CONFIG_CHR_DEV_SG=y
# CONFIG_CHR_DEV_SCH is not set
CONFIG_SCSI_MULTI_LUN=y
# CONFIG_SCSI_CONSTANTS is not set
CONFIG_SCSI_LOGGING=y
# CONFIG_SCSI_SCAN_ASYNC is not set

#
# SCSI Transports
#
# CONFIG_SCSI_SPI_ATTRS is not set
# CONFIG_SCSI_FC_ATTRS is not set
# CONFIG_SCSI_ISCSI_ATTRS is not set
# CONFIG_SCSI_SAS_ATTRS is not set
# CONFIG_SCSI_SAS_LIBSAS is not set
# CONFIG_SCSI_SRP_ATTRS is not set
CONFIG_SCSI_LOWLEVEL=y
# CONFIG_ISCSI_TCP is not set
# CONFIG_ISCSI_BOOT_SYSFS is not set
# CONFIG_SCSI_CXGB3_ISCSI is not set
# CONFIG_SCSI_CXGB4_ISCSI is not set
# CONFIG_SCSI_BNX2_ISCSI is not set
# CONFIG_SCSI_BNX2X_FCOE is not set
# CONFIG_BE2ISCSI is not set
# CONFIG_BLK_DEV_3W_XXXX_RAID is not set
# CONFIG_SCSI_HPSA is not set
# CONFIG_SCSI_3W_9XXX is not set
# CONFIG_SCSI_3W_SAS is not set
# CONFIG_SCSI_ACARD is not set
# CONFIG_SCSI_AACRAID is not set
# CONFIG_SCSI_AIC7XXX is not set
# CONFIG_SCSI_AIC7XXX_OLD is not set
# CONFIG_SCSI_AIC79XX is not set
# CONFIG_SCSI_AIC94XX is not set
# CONFIG_SCSI_MVSAS is not set
# CONFIG_SCSI_MVUMI is not set
# CONFIG_SCSI_ARCMSR is not set
# CONFIG_MEGARAID_NEWGEN is not set
# CONFIG_MEGARAID_LEGACY is not set
# CONFIG_MEGARAID_SAS is not set
# CONFIG_SCSI_MPT2SAS is not set
# CONFIG_SCSI_MPT3SAS is not set
# CONFIG_SCSI_UFSHCD is not set
# CONFIG_SCSI_HPTIOP is not set
# CONFIG_LIBFC is not set
# CONFIG_LIBFCOE is not set
# CONFIG_FCOE is not set
# CONFIG_SCSI_DMX3191D is not set
# CONFIG_SCSI_EATA is not set
# CONFIG_SCSI_FUTURE_DOMAIN is not set
# CONFIG_SCSI_GDTH is not set
# CONFIG_SCSI_IPS is not set
# CONFIG_SCSI_INITIO is not set
# CONFIG_SCSI_INIA100 is not set
# CONFIG_SCSI_STEX is not set
# CONFIG_SCSI_SYM53C8XX_2 is not set
# CONFIG_SCSI_QLOGIC_1280 is not set
# CONFIG_SCSI_QLA_FC is not set
# CONFIG_SCSI_QLA_ISCSI is not set
# CONFIG_SCSI_LPFC is not set
# CONFIG_SCSI_DC395x is not set
# CONFIG_SCSI_DC390T is not set
# CONFIG_SCSI_DEBUG is not set
# CONFIG_SCSI_PMCRAID is not set
# CONFIG_SCSI_PM8001 is not set
# CONFIG_SCSI_SRP is not set
# CONFIG_SCSI_BFA_FC is not set
# CONFIG_SCSI_CHELSIO_FCOE is not set
# CONFIG_SCSI_DH is not set
# CONFIG_SCSI_OSD_INITIATOR is not set
# CONFIG_ATA is not set
# CONFIG_MD is not set
# CONFIG_TARGET_CORE is not set
# CONFIG_FUSION is not set

#
# IEEE 1394 (FireWire) support
#
# CONFIG_FIREWIRE is not set
# CONFIG_FIREWIRE_NOSY is not set
# CONFIG_I2O is not set
# CONFIG_MACINTOSH_DRIVERS is not set
CONFIG_NETDEVICES=y
CONFIG_NET_CORE=y
# CONFIG_BONDING is not set
# CONFIG_DUMMY is not set
# CONFIG_EQUALIZER is not set
# CONFIG_NET_FC is not set
# CONFIG_MII is not set
# CONFIG_NET_TEAM is not set
# CONFIG_MACVLAN is not set
# CONFIG_VXLAN is not set
# CONFIG_NETCONSOLE is not set
# CONFIG_NETPOLL is not set
# CONFIG_NET_POLL_CONTROLLER is not set
# CONFIG_TUN is not set
# CONFIG_VETH is not set
# CONFIG_ARCNET is not set

#
# CAIF transport drivers
#

#
# Distributed Switch Architecture drivers
#
# CONFIG_NET_DSA_MV88E6XXX is not set
# CONFIG_NET_DSA_MV88E6060 is not set
# CONFIG_NET_DSA_MV88E6XXX_NEED_PPU is not set
# CONFIG_NET_DSA_MV88E6131 is not set
# CONFIG_NET_DSA_MV88E6123_61_65 is not set
CONFIG_ETHERNET=y
# CONFIG_NET_VENDOR_3COM is not set
# CONFIG_NET_VENDOR_ADAPTEC is not set
# CONFIG_NET_VENDOR_ALTEON is not set
# CONFIG_NET_VENDOR_AMD is not set
# CONFIG_NET_VENDOR_ATHEROS is not set
# CONFIG_NET_CADENCE is not set
# CONFIG_NET_VENDOR_BROADCOM is not set
# CONFIG_NET_VENDOR_BROCADE is not set
# CONFIG_NET_CALXEDA_XGMAC is not set
# CONFIG_NET_VENDOR_CHELSIO is not set
# CONFIG_NET_VENDOR_CISCO is not set
# CONFIG_DNET is not set
# CONFIG_NET_VENDOR_DEC is not set
# CONFIG_NET_VENDOR_DLINK is not set
# CONFIG_NET_VENDOR_EMULEX is not set
# CONFIG_NET_VENDOR_EXAR is not set
CONFIG_NET_VENDOR_FREESCALE=y
CONFIG_FSL_PQ_MDIO=y
# CONFIG_FSL_XGMAC_MDIO is not set
# CONFIG_GIANFAR is not set
# CONFIG_NET_VENDOR_HP is not set
CONFIG_NET_VENDOR_INTEL=y
# CONFIG_E100 is not set
# CONFIG_E1000 is not set
CONFIG_E1000E=y
# CONFIG_IGB is not set
# CONFIG_IGBVF is not set
# CONFIG_IXGB is not set
# CONFIG_IXGBE is not set
# CONFIG_IXGBEVF is not set
# CONFIG_NET_VENDOR_I825XX is not set
# CONFIG_IP1000 is not set
# CONFIG_JME is not set
CONFIG_NET_VENDOR_MARVELL=y
# CONFIG_MVMDIO is not set
# CONFIG_SKGE is not set
# CONFIG_SKY2 is not set
# CONFIG_NET_VENDOR_MELLANOX is not set
# CONFIG_NET_VENDOR_MICREL is not set
# CONFIG_NET_VENDOR_MICROCHIP is not set
# CONFIG_NET_VENDOR_MYRI is not set
# CONFIG_FEALNX is not set
# CONFIG_NET_VENDOR_NATSEMI is not set
# CONFIG_NET_VENDOR_NVIDIA is not set
# CONFIG_NET_VENDOR_OKI is not set
# CONFIG_ETHOC is not set
# CONFIG_NET_PACKET_ENGINE is not set
# CONFIG_NET_VENDOR_QLOGIC is not set
# CONFIG_NET_VENDOR_REALTEK is not set
# CONFIG_NET_VENDOR_RDC is not set
# CONFIG_NET_VENDOR_SEEQ is not set
# CONFIG_NET_VENDOR_SILAN is not set
# CONFIG_NET_VENDOR_SIS is not set
# CONFIG_SFC is not set
# CONFIG_NET_VENDOR_SMSC is not set
# CONFIG_NET_VENDOR_STMICRO is not set
# CONFIG_NET_VENDOR_SUN is not set
# CONFIG_NET_VENDOR_TEHUTI is not set
# CONFIG_NET_VENDOR_TI is not set
# CONFIG_NET_VENDOR_VIA is not set
# CONFIG_NET_VENDOR_WIZNET is not set
# CONFIG_NET_VENDOR_XILINX is not set
# CONFIG_FDDI is not set
# CONFIG_HIPPI is not set
CONFIG_PHYLIB=y

#
# MII PHY device drivers
#
# CONFIG_AT803X_PHY is not set
# CONFIG_AMD_PHY is not set
# CONFIG_MARVELL_PHY is not set
# CONFIG_DAVICOM_PHY is not set
# CONFIG_QSEMI_PHY is not set
# CONFIG_LXT_PHY is not set
# CONFIG_CICADA_PHY is not set
# CONFIG_VITESSE_PHY is not set
# CONFIG_SMSC_PHY is not set
# CONFIG_BROADCOM_PHY is not set
# CONFIG_BCM87XX_PHY is not set
# CONFIG_ICPLUS_PHY is not set
# CONFIG_REALTEK_PHY is not set
# CONFIG_NATIONAL_PHY is not set
# CONFIG_STE10XP is not set
# CONFIG_LSI_ET1011C_PHY is not set
# CONFIG_MICREL_PHY is not set
# CONFIG_FIXED_PHY is not set
# CONFIG_MDIO_BITBANG is not set
# CONFIG_MDIO_BUS_MUX_GPIO is not set
# CONFIG_MDIO_BUS_MUX_MMIOREG is not set
# CONFIG_MICREL_KS8995MA is not set
# CONFIG_PPP is not set
# CONFIG_SLIP is not set

#
# USB Network Adapters
#
# CONFIG_USB_CATC is not set
# CONFIG_USB_KAWETH is not set
# CONFIG_USB_PEGASUS is not set
# CONFIG_USB_RTL8150 is not set
# CONFIG_USB_RTL8152 is not set
# CONFIG_USB_USBNET is not set
# CONFIG_USB_IPHETH is not set
# CONFIG_WLAN is not set

#
# Enable WiMAX (Networking options) to see the WiMAX drivers
#
# CONFIG_WAN is not set
# CONFIG_VMXNET3 is not set
# CONFIG_ISDN is not set

#
# Input device support
#
CONFIG_INPUT=y
# CONFIG_INPUT_FF_MEMLESS is not set
# CONFIG_INPUT_POLLDEV is not set
# CONFIG_INPUT_SPARSEKMAP is not set
# CONFIG_INPUT_MATRIXKMAP is not set

#
# Userland interfaces
#
# CONFIG_INPUT_MOUSEDEV is not set
# CONFIG_INPUT_JOYDEV is not set
# CONFIG_INPUT_EVDEV is not set
# CONFIG_INPUT_EVBUG is not set

#
# Input Device Drivers
#
# CONFIG_INPUT_KEYBOARD is not set
# CONFIG_INPUT_MOUSE is not set
# CONFIG_INPUT_JOYSTICK is not set
# CONFIG_INPUT_TABLET is not set
# CONFIG_INPUT_TOUCHSCREEN is not set
# CONFIG_INPUT_MISC is not set

#
# Hardware I/O ports
#
# CONFIG_SERIO is not set
# CONFIG_GAMEPORT is not set

#
# Character devices
#
CONFIG_TTY=y
CONFIG_VT=y
CONFIG_CONSOLE_TRANSLATIONS=y
CONFIG_VT_CONSOLE=y
CONFIG_HW_CONSOLE=y
# CONFIG_VT_HW_CONSOLE_BINDING is not set
CONFIG_UNIX98_PTYS=y
# CONFIG_DEVPTS_MULTIPLE_INSTANCES is not set
# CONFIG_LEGACY_PTYS is not set
# CONFIG_SERIAL_NONSTANDARD is not set
# CONFIG_NOZOMI is not set
# CONFIG_N_GSM is not set
# CONFIG_TRACE_SINK is not set
# CONFIG_PPC_EPAPR_HV_BYTECHAN is not set
# CONFIG_DEVKMEM is not set

#
# Serial drivers
#
CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_DEPRECATED_OPTIONS=y
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_SERIAL_8250_DMA=y
CONFIG_SERIAL_8250_PCI=y
CONFIG_SERIAL_8250_NR_UARTS=4
CONFIG_SERIAL_8250_RUNTIME_UARTS=4
CONFIG_SERIAL_8250_EXTENDED=y
CONFIG_SERIAL_8250_MANY_PORTS=y
CONFIG_SERIAL_8250_SHARE_IRQ=y
CONFIG_SERIAL_8250_DETECT_IRQ=y
CONFIG_SERIAL_8250_RSA=y
CONFIG_SERIAL_8250_FSL=y
# CONFIG_SERIAL_8250_DW is not set

#
# Non-8250 serial port support
#
# CONFIG_SERIAL_MAX3100 is not set
# CONFIG_SERIAL_MAX310X is not set
# CONFIG_SERIAL_MFD_HSU is not set
CONFIG_SERIAL_CORE=y
CONFIG_SERIAL_CORE_CONSOLE=y
# CONFIG_SERIAL_JSM is not set
# CONFIG_SERIAL_OF_PLATFORM is not set
# CONFIG_SERIAL_SCCNXP is not set
# CONFIG_SERIAL_TIMBERDALE is not set
# CONFIG_SERIAL_ALTERA_JTAGUART is not set
# CONFIG_SERIAL_ALTERA_UART is not set
# CONFIG_SERIAL_IFX6X60 is not set
# CONFIG_SERIAL_PCH_UART is not set
# CONFIG_SERIAL_XILINX_PS_UART is not set
# CONFIG_SERIAL_ARC is not set
# CONFIG_SERIAL_RP2 is not set
# CONFIG_TTY_PRINTK is not set
# CONFIG_HVC_UDBG is not set
# CONFIG_IPMI_HANDLER is not set
CONFIG_HW_RANDOM=y
# CONFIG_HW_RANDOM_TIMERIOMEM is not set
# CONFIG_R3964 is not set
# CONFIG_APPLICOM is not set
# CONFIG_RAW_DRIVER is not set
# CONFIG_HANGCHECK_TIMER is not set
# CONFIG_TCG_TPM is not set
CONFIG_DEVPORT=y
CONFIG_I2C=y
CONFIG_I2C_BOARDINFO=y
CONFIG_I2C_COMPAT=y
# CONFIG_I2C_CHARDEV is not set
# CONFIG_I2C_MUX is not set
CONFIG_I2C_HELPER_AUTO=y

#
# I2C Hardware Bus support
#

#
# PC SMBus host controller drivers
#
# CONFIG_I2C_ALI1535 is not set
# CONFIG_I2C_ALI1563 is not set
# CONFIG_I2C_ALI15X3 is not set
# CONFIG_I2C_AMD756 is not set
# CONFIG_I2C_AMD8111 is not set
# CONFIG_I2C_I801 is not set
# CONFIG_I2C_ISCH is not set
# CONFIG_I2C_PIIX4 is not set
# CONFIG_I2C_NFORCE2 is not set
# CONFIG_I2C_SIS5595 is not set
# CONFIG_I2C_SIS630 is not set
# CONFIG_I2C_SIS96X is not set
# CONFIG_I2C_VIA is not set
# CONFIG_I2C_VIAPRO is not set

#
# I2C system bus drivers (mostly embedded / system-on-chip)
#
# CONFIG_I2C_CBUS_GPIO is not set
# CONFIG_I2C_DESIGNWARE_PCI is not set
# CONFIG_I2C_EG20T is not set
# CONFIG_I2C_GPIO is not set
# CONFIG_I2C_INTEL_MID is not set
CONFIG_I2C_MPC=y
# CONFIG_I2C_OCORES is not set
# CONFIG_I2C_PCA_PLATFORM is not set
# CONFIG_I2C_PXA_PCI is not set
# CONFIG_I2C_SIMTEC is not set
# CONFIG_I2C_XILINX is not set

#
# External I2C/SMBus adapter drivers
#
# CONFIG_I2C_DIOLAN_U2C is not set
# CONFIG_I2C_PARPORT_LIGHT is not set
# CONFIG_I2C_TAOS_EVM is not set
# CONFIG_I2C_TINY_USB is not set

#
# Other I2C/SMBus bus drivers
#
# CONFIG_I2C_STUB is not set
# CONFIG_I2C_DEBUG_CORE is not set
# CONFIG_I2C_DEBUG_ALGO is not set
# CONFIG_I2C_DEBUG_BUS is not set
CONFIG_SPI=y
# CONFIG_SPI_DEBUG is not set
CONFIG_SPI_MASTER=y

#
# SPI Master Controller Drivers
#
# CONFIG_SPI_ALTERA is not set
CONFIG_SPI_BITBANG=y
CONFIG_SPI_GPIO=y
CONFIG_SPI_FSL_LIB=y
CONFIG_SPI_FSL_CPM=y
CONFIG_SPI_FSL_SPI=y
CONFIG_SPI_FSL_ESPI=y
# CONFIG_SPI_OC_TINY is not set
# CONFIG_SPI_PXA2XX is not set
# CONFIG_SPI_PXA2XX_PCI is not set
# CONFIG_SPI_SC18IS602 is not set
# CONFIG_SPI_TOPCLIFF_PCH is not set
# CONFIG_SPI_XCOMM is not set
# CONFIG_SPI_XILINX is not set
# CONFIG_SPI_DESIGNWARE is not set

#
# SPI Protocol Masters
#
# CONFIG_SPI_SPIDEV is not set
# CONFIG_SPI_TLE62X0 is not set

#
# Qualcomm MSM SSBI bus support
#
# CONFIG_SSBI is not set
# CONFIG_HSI is not set

#
# PPS support
#
CONFIG_PPS=y
# CONFIG_PPS_DEBUG is not set

#
# PPS clients support
#
# CONFIG_PPS_CLIENT_KTIMER is not set
# CONFIG_PPS_CLIENT_LDISC is not set
# CONFIG_PPS_CLIENT_GPIO is not set

#
# PPS generators support
#

#
# PTP clock support
#
CONFIG_PTP_1588_CLOCK=y

#
# Enable PHYLIB and NETWORK_PHY_TIMESTAMPING to see the additional clocks.
#
# CONFIG_PTP_1588_CLOCK_PCH is not set
CONFIG_ARCH_WANT_OPTIONAL_GPIOLIB=y
CONFIG_ARCH_REQUIRE_GPIOLIB=y
CONFIG_GPIO_DEVRES=y
CONFIG_GPIOLIB=y
CONFIG_OF_GPIO=y
# CONFIG_DEBUG_GPIO is not set
# CONFIG_GPIO_SYSFS is not set

#
# Memory mapped GPIO drivers:
#
# CONFIG_GPIO_GENERIC_PLATFORM is not set
CONFIG_GPIO_MPC8XXX=y
# CONFIG_GPIO_TS5500 is not set
# CONFIG_GPIO_XILINX is not set
# CONFIG_GPIO_VX855 is not set
# CONFIG_GPIO_GRGPIO is not set

#
# I2C GPIO expanders:
#
# CONFIG_GPIO_MAX7300 is not set
# CONFIG_GPIO_MAX732X is not set
# CONFIG_GPIO_PCA953X is not set
# CONFIG_GPIO_PCF857X is not set
# CONFIG_GPIO_SX150X is not set
# CONFIG_GPIO_ADP5588 is not set
# CONFIG_GPIO_ADNP is not set

#
# PCI GPIO expanders:
#
# CONFIG_GPIO_BT8XX is not set
# CONFIG_GPIO_AMD8111 is not set
# CONFIG_GPIO_ML_IOH is not set
# CONFIG_GPIO_RDC321X is not set

#
# SPI GPIO expanders:
#
# CONFIG_GPIO_MAX7301 is not set
# CONFIG_GPIO_MCP23S08 is not set
# CONFIG_GPIO_MC33880 is not set
# CONFIG_GPIO_74X164 is not set

#
# AC97 GPIO expanders:
#

#
# MODULbus GPIO expanders:
#

#
# USB GPIO expanders:
#
# CONFIG_W1 is not set
# CONFIG_POWER_SUPPLY is not set
# CONFIG_POWER_AVS is not set
# CONFIG_HWMON is not set
# CONFIG_THERMAL is not set
# CONFIG_WATCHDOG is not set
CONFIG_SSB_POSSIBLE=y

#
# Sonics Silicon Backplane
#
# CONFIG_SSB is not set
CONFIG_BCMA_POSSIBLE=y

#
# Broadcom specific AMBA
#
# CONFIG_BCMA is not set

#
# Multifunction device drivers
#
# CONFIG_MFD_CORE is not set
# CONFIG_MFD_AS3711 is not set
# CONFIG_PMIC_ADP5520 is not set
# CONFIG_MFD_AAT2870_CORE is not set
# CONFIG_MFD_CROS_EC is not set
# CONFIG_PMIC_DA903X is not set
# CONFIG_MFD_DA9052_SPI is not set
# CONFIG_MFD_DA9052_I2C is not set
# CONFIG_MFD_DA9055 is not set
# CONFIG_MFD_MC13XXX_SPI is not set
# CONFIG_MFD_MC13XXX_I2C is not set
# CONFIG_HTC_PASIC3 is not set
# CONFIG_HTC_I2CPLD is not set
# CONFIG_LPC_ICH is not set
# CONFIG_LPC_SCH is not set
# CONFIG_MFD_JANZ_CMODIO is not set
# CONFIG_MFD_88PM800 is not set
# CONFIG_MFD_88PM805 is not set
# CONFIG_MFD_88PM860X is not set
# CONFIG_MFD_MAX77686 is not set
# CONFIG_MFD_MAX77693 is not set
# CONFIG_MFD_MAX8907 is not set
# CONFIG_MFD_MAX8925 is not set
# CONFIG_MFD_MAX8997 is not set
# CONFIG_MFD_MAX8998 is not set
# CONFIG_EZX_PCAP is not set
# CONFIG_MFD_VIPERBOARD is not set
# CONFIG_MFD_RETU is not set
# CONFIG_MFD_PCF50633 is not set
# CONFIG_MFD_RDC321X is not set
# CONFIG_MFD_RTSX_PCI is not set
# CONFIG_MFD_RC5T583 is not set
# CONFIG_MFD_SEC_CORE is not set
# CONFIG_MFD_SI476X_CORE is not set
# CONFIG_MFD_SM501 is not set
# CONFIG_MFD_SMSC is not set
# CONFIG_ABX500_CORE is not set
# CONFIG_MFD_STMPE is not set
# CONFIG_MFD_SYSCON is not set
# CONFIG_MFD_TI_AM335X_TSCADC is not set
# CONFIG_MFD_LP8788 is not set
# CONFIG_MFD_PALMAS is not set
# CONFIG_TPS6105X is not set
# CONFIG_TPS65010 is not set
# CONFIG_TPS6507X is not set
# CONFIG_MFD_TPS65090 is not set
# CONFIG_MFD_TPS65217 is not set
# CONFIG_MFD_TPS6586X is not set
# CONFIG_MFD_TPS65910 is not set
# CONFIG_MFD_TPS65912 is not set
# CONFIG_MFD_TPS65912_I2C is not set
# CONFIG_MFD_TPS65912_SPI is not set
# CONFIG_MFD_TPS80031 is not set
# CONFIG_TWL4030_CORE is not set
# CONFIG_TWL6040_CORE is not set
# CONFIG_MFD_WL1273_CORE is not set
# CONFIG_MFD_LM3533 is not set
# CONFIG_MFD_TIMBERDALE is not set
# CONFIG_MFD_TC3589X is not set
# CONFIG_MFD_TMIO is not set
# CONFIG_MFD_VX855 is not set
# CONFIG_MFD_ARIZONA_I2C is not set
# CONFIG_MFD_ARIZONA_SPI is not set
# CONFIG_MFD_WM8400 is not set
# CONFIG_MFD_WM831X_I2C is not set
# CONFIG_MFD_WM831X_SPI is not set
# CONFIG_MFD_WM8350_I2C is not set
# CONFIG_MFD_WM8994 is not set
# CONFIG_REGULATOR is not set
# CONFIG_MEDIA_SUPPORT is not set

#
# Graphics support
#
# CONFIG_AGP is not set
# CONFIG_VGA_ARB is not set
# CONFIG_DRM is not set
# CONFIG_VGASTATE is not set
# CONFIG_VIDEO_OUTPUT_CONTROL is not set
# CONFIG_FB is not set
# CONFIG_EXYNOS_VIDEO is not set
# CONFIG_BACKLIGHT_LCD_SUPPORT is not set

#
# Console display driver support
#
# CONFIG_VGA_CONSOLE is not set
CONFIG_DUMMY_CONSOLE=y
# CONFIG_SOUND is not set

#
# HID support
#
# CONFIG_HID is not set

#
# USB HID support
#
# CONFIG_USB_HID is not set
# CONFIG_HID_PID is not set

#
# USB HID Boot Protocol drivers
#
# CONFIG_USB_KBD is not set
# CONFIG_USB_MOUSE is not set

#
# I2C HID support
#
# CONFIG_I2C_HID is not set
CONFIG_USB_ARCH_HAS_OHCI=y
CONFIG_USB_ARCH_HAS_EHCI=y
CONFIG_USB_ARCH_HAS_XHCI=y
CONFIG_USB_SUPPORT=y
CONFIG_USB_COMMON=y
CONFIG_USB_ARCH_HAS_HCD=y
CONFIG_USB=y
# CONFIG_USB_DEBUG is not set
# CONFIG_USB_ANNOUNCE_NEW_DEVICES is not set

#
# Miscellaneous USB options
#
CONFIG_USB_DEFAULT_PERSIST=y
# CONFIG_USB_DYNAMIC_MINORS is not set
# CONFIG_USB_OTG_WHITELIST is not set
# CONFIG_USB_OTG_BLACKLIST_HUB is not set
CONFIG_USB_MON=y
# CONFIG_USB_WUSB_CBAF is not set

#
# USB Host Controller Drivers
#
# CONFIG_USB_C67X00_HCD is not set
# CONFIG_USB_XHCI_HCD is not set
CONFIG_USB_EHCI_HCD=y
CONFIG_USB_EHCI_ROOT_HUB_TT=y
CONFIG_USB_EHCI_TT_NEWSCHED=y
CONFIG_USB_FSL_MPH_DR_OF=y
CONFIG_USB_EHCI_PCI=y
CONFIG_USB_EHCI_FSL=y
CONFIG_USB_EHCI_HCD_PPC_OF=y
# CONFIG_USB_EHCI_HCD_PLATFORM is not set
# CONFIG_USB_OXU210HP_HCD is not set
# CONFIG_USB_ISP116X_HCD is not set
# CONFIG_USB_ISP1760_HCD is not set
# CONFIG_USB_ISP1362_HCD is not set
# CONFIG_USB_OHCI_HCD is not set
# CONFIG_USB_UHCI_HCD is not set
# CONFIG_USB_SL811_HCD is not set
# CONFIG_USB_R8A66597_HCD is not set

#
# USB Device Class drivers
#
# CONFIG_USB_ACM is not set
# CONFIG_USB_PRINTER is not set
# CONFIG_USB_WDM is not set
# CONFIG_USB_TMC is not set

#
# NOTE: USB_STORAGE depends on SCSI but BLK_DEV_SD may
#

#
# also be needed; see USB_STORAGE Help for more info
#
CONFIG_USB_STORAGE=y
# CONFIG_USB_STORAGE_DEBUG is not set
# CONFIG_USB_STORAGE_REALTEK is not set
# CONFIG_USB_STORAGE_DATAFAB is not set
# CONFIG_USB_STORAGE_FREECOM is not set
# CONFIG_USB_STORAGE_ISD200 is not set
# CONFIG_USB_STORAGE_USBAT is not set
# CONFIG_USB_STORAGE_SDDR09 is not set
# CONFIG_USB_STORAGE_SDDR55 is not set
# CONFIG_USB_STORAGE_JUMPSHOT is not set
# CONFIG_USB_STORAGE_ALAUDA is not set
# CONFIG_USB_STORAGE_ONETOUCH is not set
# CONFIG_USB_STORAGE_KARMA is not set
# CONFIG_USB_STORAGE_CYPRESS_ATACB is not set
# CONFIG_USB_STORAGE_ENE_UB6250 is not set

#
# USB Imaging devices
#
# CONFIG_USB_MDC800 is not set
# CONFIG_USB_MICROTEK is not set
# CONFIG_USB_DWC3 is not set
# CONFIG_USB_CHIPIDEA is not set

#
# USB port drivers
#
# CONFIG_USB_SERIAL is not set

#
# USB Miscellaneous drivers
#
# CONFIG_USB_EMI62 is not set
# CONFIG_USB_EMI26 is not set
# CONFIG_USB_ADUTUX is not set
# CONFIG_USB_SEVSEG is not set
# CONFIG_USB_RIO500 is not set
# CONFIG_USB_LEGOTOWER is not set
# CONFIG_USB_LCD is not set
# CONFIG_USB_LED is not set
# CONFIG_USB_CYPRESS_CY7C63 is not set
# CONFIG_USB_CYTHERM is not set
# CONFIG_USB_IDMOUSE is not set
# CONFIG_USB_FTDI_ELAN is not set
# CONFIG_USB_APPLEDISPLAY is not set
# CONFIG_USB_SISUSBVGA is not set
# CONFIG_USB_LD is not set
# CONFIG_USB_TRANCEVIBRATOR is not set
# CONFIG_USB_IOWARRIOR is not set
# CONFIG_USB_TEST is not set
# CONFIG_USB_ISIGHTFW is not set
# CONFIG_USB_YUREX is not set
# CONFIG_USB_EZUSB_FX2 is not set
# CONFIG_USB_HSIC_USB3503 is not set
# CONFIG_USB_PHY is not set
# CONFIG_USB_GADGET is not set
# CONFIG_UWB is not set
CONFIG_MMC=y
# CONFIG_MMC_DEBUG is not set
# CONFIG_MMC_UNSAFE_RESUME is not set
# CONFIG_MMC_CLKGATE is not set

#
# MMC/SD/SDIO Card Drivers
#
CONFIG_MMC_BLOCK=y
CONFIG_MMC_BLOCK_MINORS=8
CONFIG_MMC_BLOCK_BOUNCE=y
# CONFIG_SDIO_UART is not set
# CONFIG_MMC_TEST is not set

#
# MMC/SD/SDIO Host Controller Drivers
#
CONFIG_MMC_SDHCI=y
CONFIG_MMC_SDHCI_IO_ACCESSORS=y
CONFIG_MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER=y
# CONFIG_MMC_SDHCI_PCI is not set
CONFIG_MMC_SDHCI_PLTFM=y
CONFIG_MMC_SDHCI_OF_ESDHC=y
# CONFIG_MMC_SDHCI_OF_HLWD is not set
# CONFIG_MMC_WBSD is not set
# CONFIG_MMC_TIFM_SD is not set
# CONFIG_MMC_SPI is not set
# CONFIG_MMC_CB710 is not set
# CONFIG_MMC_VIA_SDMMC is not set
# CONFIG_MMC_VUB300 is not set
# CONFIG_MMC_USHC is not set
# CONFIG_MEMSTICK is not set
# CONFIG_NEW_LEDS is not set
# CONFIG_ACCESSIBILITY is not set
# CONFIG_INFINIBAND is not set
CONFIG_EDAC=y
CONFIG_EDAC_LEGACY_SYSFS=y
# CONFIG_EDAC_DEBUG is not set
CONFIG_EDAC_MM_EDAC=y
# CONFIG_EDAC_CPC925 is not set
CONFIG_RTC_LIB=y
CONFIG_RTC_CLASS=y
CONFIG_RTC_HCTOSYS=y
CONFIG_RTC_SYSTOHC=y
CONFIG_RTC_HCTOSYS_DEVICE="rtc0"
# CONFIG_RTC_DEBUG is not set

#
# RTC interfaces
#
CONFIG_RTC_INTF_SYSFS=y
CONFIG_RTC_INTF_PROC=y
CONFIG_RTC_INTF_DEV=y
# CONFIG_RTC_INTF_DEV_UIE_EMUL is not set
# CONFIG_RTC_DRV_TEST is not set

#
# I2C RTC drivers
#
# CONFIG_RTC_DRV_DS1307 is not set
# CONFIG_RTC_DRV_DS1374 is not set
# CONFIG_RTC_DRV_DS1672 is not set
CONFIG_RTC_DRV_DS3232=y
# CONFIG_RTC_DRV_MAX6900 is not set
# CONFIG_RTC_DRV_RS5C372 is not set
# CONFIG_RTC_DRV_ISL1208 is not set
# CONFIG_RTC_DRV_ISL12022 is not set
# CONFIG_RTC_DRV_X1205 is not set
# CONFIG_RTC_DRV_PCF8523 is not set
# CONFIG_RTC_DRV_PCF8563 is not set
# CONFIG_RTC_DRV_PCF8583 is not set
# CONFIG_RTC_DRV_M41T80 is not set
# CONFIG_RTC_DRV_BQ32K is not set
# CONFIG_RTC_DRV_S35390A is not set
# CONFIG_RTC_DRV_FM3130 is not set
# CONFIG_RTC_DRV_RX8581 is not set
# CONFIG_RTC_DRV_RX8025 is not set
# CONFIG_RTC_DRV_EM3027 is not set
# CONFIG_RTC_DRV_RV3029C2 is not set

#
# SPI RTC drivers
#
# CONFIG_RTC_DRV_M41T93 is not set
# CONFIG_RTC_DRV_M41T94 is not set
# CONFIG_RTC_DRV_DS1305 is not set
# CONFIG_RTC_DRV_DS1390 is not set
# CONFIG_RTC_DRV_MAX6902 is not set
# CONFIG_RTC_DRV_R9701 is not set
# CONFIG_RTC_DRV_RS5C348 is not set
# CONFIG_RTC_DRV_DS3234 is not set
# CONFIG_RTC_DRV_PCF2123 is not set
# CONFIG_RTC_DRV_RX4581 is not set

#
# Platform RTC drivers
#
# CONFIG_RTC_DRV_CMOS is not set
# CONFIG_RTC_DRV_DS1286 is not set
# CONFIG_RTC_DRV_DS1511 is not set
# CONFIG_RTC_DRV_DS1553 is not set
# CONFIG_RTC_DRV_DS1742 is not set
# CONFIG_RTC_DRV_STK17TA8 is not set
# CONFIG_RTC_DRV_M48T86 is not set
# CONFIG_RTC_DRV_M48T35 is not set
# CONFIG_RTC_DRV_M48T59 is not set
# CONFIG_RTC_DRV_MSM6242 is not set
# CONFIG_RTC_DRV_BQ4802 is not set
# CONFIG_RTC_DRV_RP5C01 is not set
# CONFIG_RTC_DRV_V3020 is not set
# CONFIG_RTC_DRV_DS2404 is not set

#
# on-CPU RTC drivers
#
# CONFIG_RTC_DRV_GENERIC is not set
# CONFIG_RTC_DRV_SNVS is not set

#
# HID Sensor RTC drivers
#
CONFIG_DMADEVICES=y
# CONFIG_DMADEVICES_DEBUG is not set

#
# DMA Devices
#
CONFIG_ASYNC_TX_ENABLE_CHANNEL_SWITCH=y
# CONFIG_DW_DMAC is not set
CONFIG_FSL_DMA=y
# CONFIG_TIMB_DMA is not set
CONFIG_DMA_ENGINE=y
CONFIG_DMA_OF=y

#
# DMA Clients
#
CONFIG_NET_DMA=y
# CONFIG_ASYNC_TX_DMA is not set
# CONFIG_DMATEST is not set
# CONFIG_AUXDISPLAY is not set
# CONFIG_UIO is not set
# CONFIG_VIRT_DRIVERS is not set

#
# Virtio drivers
#
# CONFIG_VIRTIO_PCI is not set
# CONFIG_VIRTIO_MMIO is not set

#
# Microsoft Hyper-V guest support
#
# CONFIG_STAGING is not set

#
# Hardware Spinlock drivers
#
# CONFIG_MAILBOX is not set
CONFIG_IOMMU_SUPPORT=y
CONFIG_OF_IOMMU=y

#
# Remoteproc drivers
#
# CONFIG_STE_MODEM_RPROC is not set

#
# Rpmsg drivers
#
# CONFIG_PM_DEVFREQ is not set
# CONFIG_EXTCON is not set
# CONFIG_MEMORY is not set
# CONFIG_IIO is not set
# CONFIG_VME_BUS is not set
# CONFIG_PWM is not set
CONFIG_IRQCHIP=y
# CONFIG_IPACK_BUS is not set
# CONFIG_RESET_CONTROLLER is not set

#
# File systems
#
CONFIG_EXT2_FS=y
# CONFIG_EXT2_FS_XATTR is not set
# CONFIG_EXT2_FS_XIP is not set
CONFIG_EXT3_FS=y
CONFIG_EXT3_DEFAULTS_TO_ORDERED=y
CONFIG_EXT3_FS_XATTR=y
# CONFIG_EXT3_FS_POSIX_ACL is not set
# CONFIG_EXT3_FS_SECURITY is not set
# CONFIG_EXT4_FS is not set
CONFIG_JBD=y
# CONFIG_JBD_DEBUG is not set
CONFIG_FS_MBCACHE=y
# CONFIG_REISERFS_FS is not set
# CONFIG_JFS_FS is not set
# CONFIG_XFS_FS is not set
# CONFIG_GFS2_FS is not set
# CONFIG_BTRFS_FS is not set
# CONFIG_NILFS2_FS is not set
# CONFIG_FS_POSIX_ACL is not set
CONFIG_EXPORTFS=y
CONFIG_FILE_LOCKING=y
CONFIG_FSNOTIFY=y
CONFIG_DNOTIFY=y
CONFIG_INOTIFY_USER=y
# CONFIG_FANOTIFY is not set
# CONFIG_QUOTA is not set
# CONFIG_QUOTACTL is not set
# CONFIG_AUTOFS4_FS is not set
# CONFIG_FUSE_FS is not set

#
# Caches
#
# CONFIG_FSCACHE is not set

#
# CD-ROM/DVD Filesystems
#
CONFIG_ISO9660_FS=m
CONFIG_JOLIET=y
CONFIG_ZISOFS=y
CONFIG_UDF_FS=m
CONFIG_UDF_NLS=y

#
# DOS/FAT/NT Filesystems
#
CONFIG_FAT_FS=y
CONFIG_MSDOS_FS=y
CONFIG_VFAT_FS=y
CONFIG_FAT_DEFAULT_CODEPAGE=850
CONFIG_FAT_DEFAULT_IOCHARSET="iso8859-1"
CONFIG_NTFS_FS=y
# CONFIG_NTFS_DEBUG is not set
# CONFIG_NTFS_RW is not set

#
# Pseudo filesystems
#
CONFIG_PROC_FS=y
CONFIG_PROC_KCORE=y
CONFIG_PROC_SYSCTL=y
CONFIG_PROC_PAGE_MONITOR=y
CONFIG_SYSFS=y
CONFIG_TMPFS=y
# CONFIG_TMPFS_POSIX_ACL is not set
# CONFIG_TMPFS_XATTR is not set
CONFIG_HUGETLBFS=y
CONFIG_HUGETLB_PAGE=y
# CONFIG_CONFIGFS_FS is not set
# CONFIG_MISC_FILESYSTEMS is not set
CONFIG_NETWORK_FILESYSTEMS=y
CONFIG_NFS_FS=y
CONFIG_NFS_V2=y
CONFIG_NFS_V3=y
# CONFIG_NFS_V3_ACL is not set
CONFIG_NFS_V4=y
# CONFIG_NFS_SWAP is not set
# CONFIG_NFS_V4_1 is not set
CONFIG_ROOT_NFS=y
# CONFIG_NFS_USE_LEGACY_DNS is not set
CONFIG_NFS_USE_KERNEL_DNS=y
CONFIG_NFSD=y
# CONFIG_NFSD_V3 is not set
# CONFIG_NFSD_V4 is not set
CONFIG_LOCKD=y
CONFIG_LOCKD_V4=y
CONFIG_NFS_COMMON=y
CONFIG_SUNRPC=y
CONFIG_SUNRPC_GSS=y
# CONFIG_SUNRPC_DEBUG is not set
# CONFIG_CEPH_FS is not set
# CONFIG_CIFS is not set
# CONFIG_NCP_FS is not set
# CONFIG_CODA_FS is not set
# CONFIG_AFS_FS is not set
CONFIG_NLS=y
CONFIG_NLS_DEFAULT="iso8859-1"
CONFIG_NLS_CODEPAGE_437=y
# CONFIG_NLS_CODEPAGE_737 is not set
# CONFIG_NLS_CODEPAGE_775 is not set
CONFIG_NLS_CODEPAGE_850=y
# CONFIG_NLS_CODEPAGE_852 is not set
# CONFIG_NLS_CODEPAGE_855 is not set
# CONFIG_NLS_CODEPAGE_857 is not set
# CONFIG_NLS_CODEPAGE_860 is not set
# CONFIG_NLS_CODEPAGE_861 is not set
# CONFIG_NLS_CODEPAGE_862 is not set
# CONFIG_NLS_CODEPAGE_863 is not set
# CONFIG_NLS_CODEPAGE_864 is not set
# CONFIG_NLS_CODEPAGE_865 is not set
# CONFIG_NLS_CODEPAGE_866 is not set
# CONFIG_NLS_CODEPAGE_869 is not set
# CONFIG_NLS_CODEPAGE_936 is not set
# CONFIG_NLS_CODEPAGE_950 is not set
# CONFIG_NLS_CODEPAGE_932 is not set
# CONFIG_NLS_CODEPAGE_949 is not set
# CONFIG_NLS_CODEPAGE_874 is not set
# CONFIG_NLS_ISO8859_8 is not set
# CONFIG_NLS_CODEPAGE_1250 is not set
# CONFIG_NLS_CODEPAGE_1251 is not set
# CONFIG_NLS_ASCII is not set
CONFIG_NLS_ISO8859_1=y
# CONFIG_NLS_ISO8859_2 is not set
# CONFIG_NLS_ISO8859_3 is not set
# CONFIG_NLS_ISO8859_4 is not set
# CONFIG_NLS_ISO8859_5 is not set
# CONFIG_NLS_ISO8859_6 is not set
# CONFIG_NLS_ISO8859_7 is not set
# CONFIG_NLS_ISO8859_9 is not set
# CONFIG_NLS_ISO8859_13 is not set
# CONFIG_NLS_ISO8859_14 is not set
CONFIG_NLS_ISO8859_15=y
# CONFIG_NLS_KOI8_R is not set
# CONFIG_NLS_KOI8_U is not set
# CONFIG_NLS_MAC_ROMAN is not set
# CONFIG_NLS_MAC_CELTIC is not set
# CONFIG_NLS_MAC_CENTEURO is not set
# CONFIG_NLS_MAC_CROATIAN is not set
# CONFIG_NLS_MAC_CYRILLIC is not set
# CONFIG_NLS_MAC_GAELIC is not set
# CONFIG_NLS_MAC_GREEK is not set
# CONFIG_NLS_MAC_ICELAND is not set
# CONFIG_NLS_MAC_INUIT is not set
# CONFIG_NLS_MAC_ROMANIAN is not set
# CONFIG_NLS_MAC_TURKISH is not set
CONFIG_NLS_UTF8=y
# CONFIG_BINARY_PRINTF is not set

#
# Library routines
#
CONFIG_BITREVERSE=y
CONFIG_GENERIC_STRNCPY_FROM_USER=y
CONFIG_GENERIC_STRNLEN_USER=y
CONFIG_GENERIC_PCI_IOMAP=y
CONFIG_GENERIC_IOMAP=y
CONFIG_GENERIC_IO=y
# CONFIG_CRC_CCITT is not set
# CONFIG_CRC16 is not set
# CONFIG_CRC_T10DIF is not set
CONFIG_CRC_ITU_T=y
CONFIG_CRC32=y
# CONFIG_CRC32_SELFTEST is not set
CONFIG_CRC32_SLICEBY8=y
# CONFIG_CRC32_SLICEBY4 is not set
# CONFIG_CRC32_SARWATE is not set
# CONFIG_CRC32_BIT is not set
# CONFIG_CRC7 is not set
# CONFIG_LIBCRC32C is not set
# CONFIG_CRC8 is not set
CONFIG_ZLIB_INFLATE=y
# CONFIG_XZ_DEC is not set
# CONFIG_XZ_DEC_BCJ is not set
CONFIG_DECOMPRESS_GZIP=y
CONFIG_HAS_IOMEM=y
CONFIG_HAS_IOPORT=y
CONFIG_HAS_DMA=y
CONFIG_CPU_RMAP=y
CONFIG_DQL=y
CONFIG_NLATTR=y
CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE=y
# CONFIG_AVERAGE is not set
# CONFIG_CORDIC is not set
# CONFIG_DDR is not set
CONFIG_OID_REGISTRY=y

#
# Kernel hacking
#
# CONFIG_PRINTK_TIME is not set
CONFIG_DEFAULT_MESSAGE_LOGLEVEL=4
CONFIG_ENABLE_WARN_DEPRECATED=y
CONFIG_ENABLE_MUST_CHECK=y
CONFIG_FRAME_WARN=1024
CONFIG_MAGIC_SYSRQ=y
# CONFIG_STRIP_ASM_SYMS is not set
# CONFIG_READABLE_ASM is not set
# CONFIG_UNUSED_SYMBOLS is not set
CONFIG_DEBUG_FS=y
# CONFIG_HEADERS_CHECK is not set
# CONFIG_DEBUG_SECTION_MISMATCH is not set
CONFIG_DEBUG_KERNEL=y
CONFIG_DEBUG_SHIRQ=y
# CONFIG_LOCKUP_DETECTOR is not set
# CONFIG_PANIC_ON_OOPS is not set
CONFIG_PANIC_ON_OOPS_VALUE=0
CONFIG_DETECT_HUNG_TASK=y
CONFIG_DEFAULT_HUNG_TASK_TIMEOUT=120
# CONFIG_BOOTPARAM_HUNG_TASK_PANIC is not set
CONFIG_BOOTPARAM_HUNG_TASK_PANIC_VALUE=0
CONFIG_SCHED_DEBUG=y
# CONFIG_SCHEDSTATS is not set
# CONFIG_TIMER_STATS is not set
# CONFIG_DEBUG_OBJECTS is not set
# CONFIG_SLUB_DEBUG_ON is not set
# CONFIG_SLUB_STATS is not set
CONFIG_HAVE_DEBUG_KMEMLEAK=y
# CONFIG_DEBUG_KMEMLEAK is not set
# CONFIG_DEBUG_RT_MUTEXES is not set
# CONFIG_RT_MUTEX_TESTER is not set
# CONFIG_DEBUG_SPINLOCK is not set
# CONFIG_DEBUG_MUTEXES is not set
# CONFIG_DEBUG_LOCK_ALLOC is not set
# CONFIG_PROVE_LOCKING is not set
# CONFIG_LOCK_STAT is not set
# CONFIG_DEBUG_ATOMIC_SLEEP is not set
# CONFIG_DEBUG_LOCKING_API_SELFTESTS is not set
# CONFIG_DEBUG_STACK_USAGE is not set
# CONFIG_DEBUG_KOBJECT is not set
CONFIG_DEBUG_BUGVERBOSE=y
CONFIG_DEBUG_INFO=y
# CONFIG_DEBUG_INFO_REDUCED is not set
# CONFIG_DEBUG_VM is not set
# CONFIG_DEBUG_WRITECOUNT is not set
# CONFIG_DEBUG_MEMORY_INIT is not set
# CONFIG_DEBUG_LIST is not set
# CONFIG_TEST_LIST_SORT is not set
# CONFIG_DEBUG_SG is not set
# CONFIG_DEBUG_NOTIFIERS is not set
# CONFIG_DEBUG_CREDENTIALS is not set

#
# RCU Debugging
#
# CONFIG_SPARSE_RCU_POINTER is not set
# CONFIG_RCU_TORTURE_TEST is not set
CONFIG_RCU_CPU_STALL_TIMEOUT=21
# CONFIG_RCU_CPU_STALL_INFO is not set
# CONFIG_RCU_TRACE is not set
# CONFIG_BACKTRACE_SELF_TEST is not set
# CONFIG_DEBUG_BLOCK_EXT_DEVT is not set
# CONFIG_DEBUG_FORCE_WEAK_PER_CPU is not set
# CONFIG_DEBUG_PER_CPU_MAPS is not set
# CONFIG_LKDTM is not set
# CONFIG_NOTIFIER_ERROR_INJECTION is not set
# CONFIG_FAULT_INJECTION is not set
# CONFIG_LATENCYTOP is not set
# CONFIG_DEBUG_PAGEALLOC is not set
CONFIG_HAVE_FUNCTION_TRACER=y
CONFIG_HAVE_FUNCTION_GRAPH_TRACER=y
CONFIG_HAVE_DYNAMIC_FTRACE=y
CONFIG_HAVE_FTRACE_MCOUNT_RECORD=y
CONFIG_HAVE_SYSCALL_TRACEPOINTS=y
CONFIG_TRACING_SUPPORT=y
CONFIG_FTRACE=y
# CONFIG_FUNCTION_TRACER is not set
# CONFIG_IRQSOFF_TRACER is not set
# CONFIG_SCHED_TRACER is not set
# CONFIG_ENABLE_DEFAULT_TRACERS is not set
# CONFIG_FTRACE_SYSCALLS is not set
# CONFIG_TRACER_SNAPSHOT is not set
CONFIG_BRANCH_PROFILE_NONE=y
# CONFIG_PROFILE_ANNOTATED_BRANCHES is not set
# CONFIG_PROFILE_ALL_BRANCHES is not set
# CONFIG_STACK_TRACER is not set
# CONFIG_BLK_DEV_IO_TRACE is not set
# CONFIG_UPROBE_EVENT is not set
# CONFIG_PROBE_EVENTS is not set
# CONFIG_RBTREE_TEST is not set
# CONFIG_INTERVAL_TREE_TEST is not set
# CONFIG_DYNAMIC_DEBUG is not set
# CONFIG_DMA_API_DEBUG is not set
# CONFIG_ATOMIC64_SELFTEST is not set
# CONFIG_SAMPLES is not set
CONFIG_HAVE_ARCH_KGDB=y
# CONFIG_KGDB is not set
# CONFIG_TEST_STRING_HELPERS is not set
# CONFIG_TEST_KSTRTOX is not set
# CONFIG_PPC_DISABLE_WERROR is not set
CONFIG_PPC_WERROR=y
CONFIG_PRINT_STACK_DEPTH=64
# CONFIG_DEBUG_STACKOVERFLOW is not set
# CONFIG_PPC_EMULATED_STATS is not set
# CONFIG_CODE_PATCHING_SELFTEST is not set
# CONFIG_FTR_FIXUP_SELFTEST is not set
# CONFIG_MSI_BITMAP_SELFTEST is not set
# CONFIG_XMON is not set
# CONFIG_PPC_EARLY_DEBUG is not set
# CONFIG_STRICT_DEVMEM is not set

#
# Security options
#
CONFIG_KEYS=y
# CONFIG_ENCRYPTED_KEYS is not set
# CONFIG_KEYS_DEBUG_PROC_KEYS is not set
# CONFIG_SECURITY_DMESG_RESTRICT is not set
# CONFIG_SECURITY is not set
# CONFIG_SECURITYFS is not set
CONFIG_DEFAULT_SECURITY_DAC=y
CONFIG_DEFAULT_SECURITY=""
CONFIG_KEYS_COMPAT=y
CONFIG_CRYPTO=y

#
# Crypto core or helper
#
CONFIG_CRYPTO_ALGAPI=y
CONFIG_CRYPTO_ALGAPI2=y
CONFIG_CRYPTO_AEAD=y
CONFIG_CRYPTO_AEAD2=y
CONFIG_CRYPTO_BLKCIPHER=y
CONFIG_CRYPTO_BLKCIPHER2=y
CONFIG_CRYPTO_HASH=y
CONFIG_CRYPTO_HASH2=y
CONFIG_CRYPTO_RNG=y
CONFIG_CRYPTO_RNG2=y
CONFIG_CRYPTO_PCOMP2=y
CONFIG_CRYPTO_MANAGER=y
CONFIG_CRYPTO_MANAGER2=y
# CONFIG_CRYPTO_USER is not set
CONFIG_CRYPTO_MANAGER_DISABLE_TESTS=y
# CONFIG_CRYPTO_GF128MUL is not set
CONFIG_CRYPTO_NULL=y
# CONFIG_CRYPTO_PCRYPT is not set
CONFIG_CRYPTO_WORKQUEUE=y
# CONFIG_CRYPTO_CRYPTD is not set
CONFIG_CRYPTO_AUTHENC=y
# CONFIG_CRYPTO_TEST is not set

#
# Authenticated Encryption with Associated Data
#
# CONFIG_CRYPTO_CCM is not set
# CONFIG_CRYPTO_GCM is not set
# CONFIG_CRYPTO_SEQIV is not set

#
# Block modes
#
CONFIG_CRYPTO_CBC=y
# CONFIG_CRYPTO_CTR is not set
# CONFIG_CRYPTO_CTS is not set
# CONFIG_CRYPTO_ECB is not set
# CONFIG_CRYPTO_LRW is not set
# CONFIG_CRYPTO_PCBC is not set
# CONFIG_CRYPTO_XTS is not set

#
# Hash modes
#
# CONFIG_CRYPTO_CMAC is not set
CONFIG_CRYPTO_HMAC=y
# CONFIG_CRYPTO_XCBC is not set
# CONFIG_CRYPTO_VMAC is not set

#
# Digest
#
# CONFIG_CRYPTO_CRC32C is not set
# CONFIG_CRYPTO_CRC32 is not set
# CONFIG_CRYPTO_GHASH is not set
CONFIG_CRYPTO_MD4=y
CONFIG_CRYPTO_MD5=y
# CONFIG_CRYPTO_MICHAEL_MIC is not set
# CONFIG_CRYPTO_RMD128 is not set
# CONFIG_CRYPTO_RMD160 is not set
# CONFIG_CRYPTO_RMD256 is not set
# CONFIG_CRYPTO_RMD320 is not set
CONFIG_CRYPTO_SHA1=y
# CONFIG_CRYPTO_SHA1_PPC is not set
CONFIG_CRYPTO_SHA256=y
CONFIG_CRYPTO_SHA512=y
# CONFIG_CRYPTO_TGR192 is not set
# CONFIG_CRYPTO_WP512 is not set

#
# Ciphers
#
CONFIG_CRYPTO_AES=y
# CONFIG_CRYPTO_ANUBIS is not set
# CONFIG_CRYPTO_ARC4 is not set
# CONFIG_CRYPTO_BLOWFISH is not set
# CONFIG_CRYPTO_CAMELLIA is not set
# CONFIG_CRYPTO_CAST5 is not set
# CONFIG_CRYPTO_CAST6 is not set
CONFIG_CRYPTO_DES=y
# CONFIG_CRYPTO_FCRYPT is not set
# CONFIG_CRYPTO_KHAZAD is not set
# CONFIG_CRYPTO_SALSA20 is not set
# CONFIG_CRYPTO_SEED is not set
# CONFIG_CRYPTO_SERPENT is not set
# CONFIG_CRYPTO_TEA is not set
# CONFIG_CRYPTO_TWOFISH is not set

#
# Compression
#
# CONFIG_CRYPTO_DEFLATE is not set
# CONFIG_CRYPTO_ZLIB is not set
# CONFIG_CRYPTO_LZO is not set

#
# Random Number Generation
#
# CONFIG_CRYPTO_ANSI_CPRNG is not set
# CONFIG_CRYPTO_USER_API_HASH is not set
# CONFIG_CRYPTO_USER_API_SKCIPHER is not set
CONFIG_CRYPTO_HW=y
CONFIG_CRYPTO_DEV_FSL_CAAM=y
CONFIG_CRYPTO_DEV_FSL_CAAM_RINGSIZE=9
# CONFIG_CRYPTO_DEV_FSL_CAAM_INTC is not set
CONFIG_CRYPTO_DEV_FSL_CAAM_CRYPTO_API=y
CONFIG_CRYPTO_DEV_FSL_CAAM_AHASH_API=y
CONFIG_CRYPTO_DEV_FSL_CAAM_RNG_API=y
# CONFIG_CRYPTO_DEV_TALITOS is not set
# CONFIG_ASYMMETRIC_KEY_TYPE is not set
# CONFIG_PPC_CLOCK is not set
# CONFIG_VIRTUALIZATION is not set

Re: Regression in RCU subsystem in latest mainline kernel

[Steven Rostedt]

On Fri, 2013-06-14 at 14:46 +0200, Rojhalat Ibrahim wrote:
> On Friday 14 June 2013 05:28:00 Paul E. McKenney wrote:
> > On Fri, Jun 14, 2013 at 01:47:00PM +0200, Rojhalat Ibrahim wrote:
> > > Hi,
> > > 
> > > the current mainline kernel from git reproducibly hangs on my Freescale
> > > PowerPC P5020DS development system. Most of the time the hang occurs
> > > during
> > > boot (kernel just stops booting, system hangs), sometimes shortly after
> > > booting (system hangs, no message). Very often booting stops at the
> > > initialization of the Intel PRO 1000 PCIe network device (e1000e).

I was pretty much able to reproduce this on my PA Semi PPC box. Funny
thing is, when I type on the console, it makes progress. Anyway, it
seems that powerpc has an issue with irq_work(). I'll try to get some
time either tonight or next week to figure it out.

Thanks!

-- Steve

> > > 
> > > I used git bisect and arrived at this commit:
> > > 
> > > 016a8d5be6ddcc72ef0432d82d9f6fa34f61b907
> > > rcu: Don't call wakeup() with rcu_node structure ->lock held
> > > 
> > > With versions before that commit the system runs normally.
> > 
> > Odd, given that this fix was intended to prevent hangs.  Could you
> > please send your .config?
> > 
> > 							Thanx, Paul

Re: Regression in RCU subsystem in latest mainline kernel

[Benjamin Herrenschmidt]

On Fri, 2013-06-14 at 17:06 -0400, Steven Rostedt wrote:
> I was pretty much able to reproduce this on my PA Semi PPC box. Funny
> thing is, when I type on the console, it makes progress. Anyway, it
> seems that powerpc has an issue with irq_work(). I'll try to get some
> time either tonight or next week to figure it out.

Does this help ?

diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 5cbcf4d..ea185e0 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -162,7 +162,7 @@ notrace unsigned int __check_irq_replay(void)
 	 * in case we also had a rollover while hard disabled
 	 */
 	local_paca->irq_happened &= ~PACA_IRQ_DEC;
-	if (decrementer_check_overflow())
+	if ((happened & PACA_IRQ_DEC) || decrementer_check_overflow())
 		return 0x900;
 
 	/* Finally check if an external interrupt happened */

Cheers,
Ben.

Re: Regression in RCU subsystem in latest mainline kernel

[Steven Rostedt]

On Sat, 2013-06-15 at 12:02 +1000, Benjamin Herrenschmidt wrote:
> On Fri, 2013-06-14 at 17:06 -0400, Steven Rostedt wrote:
> > I was pretty much able to reproduce this on my PA Semi PPC box. Funny
> > thing is, when I type on the console, it makes progress. Anyway, it
> > seems that powerpc has an issue with irq_work(). I'll try to get some
> > time either tonight or next week to figure it out.
> 
> Does this help ?

It did for me. Rojhalat, did this fix your issue too?

-- Steve

> 
> diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
> index 5cbcf4d..ea185e0 100644
> --- a/arch/powerpc/kernel/irq.c
> +++ b/arch/powerpc/kernel/irq.c
> @@ -162,7 +162,7 @@ notrace unsigned int __check_irq_replay(void)
>  	 * in case we also had a rollover while hard disabled
>  	 */
>  	local_paca->irq_happened &= ~PACA_IRQ_DEC;
> -	if (decrementer_check_overflow())
> +	if ((happened & PACA_IRQ_DEC) || decrementer_check_overflow())
>  		return 0x900;
>  
>  	/* Finally check if an external interrupt happened */
> 
> Cheers,
> Ben.
> 

Re: Regression in RCU subsystem in latest mainline kernel

[Benjamin Herrenschmidt]

On Fri, 2013-06-14 at 22:17 -0400, Steven Rostedt wrote:
> On Sat, 2013-06-15 at 12:02 +1000, Benjamin Herrenschmidt wrote:
> > On Fri, 2013-06-14 at 17:06 -0400, Steven Rostedt wrote:
> > > I was pretty much able to reproduce this on my PA Semi PPC box. Funny
> > > thing is, when I type on the console, it makes progress. Anyway, it
> > > seems that powerpc has an issue with irq_work(). I'll try to get some
> > > time either tonight or next week to figure it out.
> > 
> > Does this help ?
> 
> It did for me. Rojhalat, did this fix your issue too?

Ok, adding that to what I'm about to send to Linus.

Cheers,
Ben.

Re: Regression in RCU subsystem in latest mainline kernel

[Steven Rostedt]

On Sat, 2013-06-15 at 12:21 +1000, Benjamin Herrenschmidt wrote:
> On Fri, 2013-06-14 at 22:17 -0400, Steven Rostedt wrote:
> > On Sat, 2013-06-15 at 12:02 +1000, Benjamin Herrenschmidt wrote:
> > > On Fri, 2013-06-14 at 17:06 -0400, Steven Rostedt wrote:
> > > > I was pretty much able to reproduce this on my PA Semi PPC box. Funny
> > > > thing is, when I type on the console, it makes progress. Anyway, it
> > > > seems that powerpc has an issue with irq_work(). I'll try to get some
> > > > time either tonight or next week to figure it out.
> > > 
> > > Does this help ?
> > 
> > It did for me. Rojhalat, did this fix your issue too?
> 
> Ok, adding that to what I'm about to send to Linus.
> 

Feel free to add: Tested-by: Steven Rostedt <rostedt@goodmis.org>

-- Steve

Re: Regression in RCU subsystem in latest mainline kernel

[Paul E. McKenney]

On Fri, Jun 14, 2013 at 10:31:12PM -0400, Steven Rostedt wrote:
> On Sat, 2013-06-15 at 12:21 +1000, Benjamin Herrenschmidt wrote:
> > On Fri, 2013-06-14 at 22:17 -0400, Steven Rostedt wrote:
> > > On Sat, 2013-06-15 at 12:02 +1000, Benjamin Herrenschmidt wrote:
> > > > On Fri, 2013-06-14 at 17:06 -0400, Steven Rostedt wrote:
> > > > > I was pretty much able to reproduce this on my PA Semi PPC box. Funny
> > > > > thing is, when I type on the console, it makes progress. Anyway, it
> > > > > seems that powerpc has an issue with irq_work(). I'll try to get some
> > > > > time either tonight or next week to figure it out.
> > > > 
> > > > Does this help ?
> > > 
> > > It did for me. Rojhalat, did this fix your issue too?
> > 
> > Ok, adding that to what I'm about to send to Linus.
> 
> Feel free to add: Tested-by: Steven Rostedt <rostedt@goodmis.org>

Thank you both!!!

							Thanx, Paul

Re: Regression in RCU subsystem in latest mainline kernel

[Rojhalat Ibrahim]

On Friday 14 June 2013 22:17:34 Steven Rostedt wrote:
> On Sat, 2013-06-15 at 12:02 +1000, Benjamin Herrenschmidt wrote:
> > On Fri, 2013-06-14 at 17:06 -0400, Steven Rostedt wrote:
> > > I was pretty much able to reproduce this on my PA Semi PPC box. Funny
> > > thing is, when I type on the console, it makes progress. Anyway, it
> > > seems that powerpc has an issue with irq_work(). I'll try to get some
> > > time either tonight or next week to figure it out.
> > 
> > Does this help ?
> 
> It did for me. Rojhalat, did this fix your issue too?
> 

FWIW, since the fix is already applied, but it fixes my problem too.

   Rojhalat


> -- Steve
> 
> > diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
> > index 5cbcf4d..ea185e0 100644
> > --- a/arch/powerpc/kernel/irq.c
> > +++ b/arch/powerpc/kernel/irq.c
> > @@ -162,7 +162,7 @@ notrace unsigned int __check_irq_replay(void)
> > 
> >  	 * in case we also had a rollover while hard disabled
> >  	 */
> >  	
> >  	local_paca->irq_happened &= ~PACA_IRQ_DEC;
> > 
> > -	if (decrementer_check_overflow())
> > +	if ((happened & PACA_IRQ_DEC) || decrementer_check_overflow())
> > 
> >  		return 0x900;
> >  	
> >  	/* Finally check if an external interrupt happened */
> > 
> > Cheers,
> > Ben.

Re: Regression in RCU subsystem in latest mainline kernel

[Steven Rostedt]

On Mon, 2013-06-17 at 15:21 +0200, Rojhalat Ibrahim wrote:
> On Friday 14 June 2013 22:17:34 Steven Rostedt wrote:
> > On Sat, 2013-06-15 at 12:02 +1000, Benjamin Herrenschmidt wrote:
> > > On Fri, 2013-06-14 at 17:06 -0400, Steven Rostedt wrote:
> > > > I was pretty much able to reproduce this on my PA Semi PPC box. Funny
> > > > thing is, when I type on the console, it makes progress. Anyway, it
> > > > seems that powerpc has an issue with irq_work(). I'll try to get some
> > > > time either tonight or next week to figure it out.
> > > 
> > > Does this help ?
> > 
> > It did for me. Rojhalat, did this fix your issue too?
> > 
> 
> FWIW, since the fix is already applied, but it fixes my problem too.
> 

Thanks for the update. Yeah, Ben was about to send a queue to Linus, and
as this proved to fix it for me, he felt that it needed to go in that
queue instead of waiting for an update.

But I do appreciate the update as I wasn't 100% that this would fix the
problem for you too.

-- Steve

Re: Regression in RCU subsystem in latest mainline kernel

[Michael Ellerman]

On Sat, Jun 15, 2013 at 12:02:21PM +1000, Benjamin Herrenschmidt wrote:
> On Fri, 2013-06-14 at 17:06 -0400, Steven Rostedt wrote:
> > I was pretty much able to reproduce this on my PA Semi PPC box. Funny
> > thing is, when I type on the console, it makes progress. Anyway, it
> > seems that powerpc has an issue with irq_work(). I'll try to get some
> > time either tonight or next week to figure it out.
> 
> Does this help ?
> 
> diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
> index 5cbcf4d..ea185e0 100644
> --- a/arch/powerpc/kernel/irq.c
> +++ b/arch/powerpc/kernel/irq.c
> @@ -162,7 +162,7 @@ notrace unsigned int __check_irq_replay(void)
>  	 * in case we also had a rollover while hard disabled
>  	 */
>  	local_paca->irq_happened &= ~PACA_IRQ_DEC;
> -	if (decrementer_check_overflow())
> +	if ((happened & PACA_IRQ_DEC) || decrementer_check_overflow())
>  		return 0x900;
>  
>  	/* Finally check if an external interrupt happened */
> 

This seems to help, but doesn't elminate the RCU stall warnings I am
seeing. I now see them less often, but not never.

Stack trace is something like:

  INFO: rcu_sched detected stalls on CPUs/tasks: { 32} (detected by 12, t=21372 jiffies, g=18446744073709551503, c=18446744073709551502, q=1018)
  Task dump for CPU 32:
  power8-events   R  running task     4960  2009   1988 0x00000004
  Call Trace:
  [c000000fb0e3f910] [c000000fb0e3f9d0] 0xc000000fb0e3f9d0 (unreliable)
  
  [c000000fb0e3edc0] [c0000000000b2894] .__run_hrtimer+0xa4/0x2a0
  [c000000fb0e3ee70] [c0000000000b36d8] .hrtimer_interrupt+0x148/0x320
  [c000000fb0e3ef80] [c00000000001c754] .timer_interrupt+0x134/0x320
  [c000000fb0e3f040] [c00000000000a4f4] restore_check_irq_replay+0x68/0xa8
  --- Exception: 901 at .arch_local_irq_restore+0x24/0x90
      LR = .__do_softirq+0x100/0x3a0
  [c000000fb0e3f330] [c0000000000c4784] .vtime_account_irq_enter+0x34/0x70 (unreliable)
  [c000000fb0e3f3a0] [c000000000089680] .__do_softirq+0x100/0x3a0
  [c000000fb0e3f4c0] [c000000000089b38] .irq_exit+0xc8/0x110
  [c000000fb0e3f540] [c00000000001c788] .timer_interrupt+0x168/0x320
  [c000000fb0e3f600] [c0000000000025cc] decrementer_common+0x14c/0x180
  --- Exception: 901 at .arch_local_irq_restore+0x74/0x90
      LR = .arch_local_irq_restore+0x74/0x90
  [c000000fb0e3f8f0] [c000000fb0e3f970] 0xc000000fb0e3f970 (unreliable)
  [c000000fb0e3f960] [c0000000000e4ae0] .smp_call_function_single+0x1d0/0x1e0
  [c000000fb0e3fa10] [c000000000147aa4] .task_function_call+0x54/0x70
  [c000000fb0e3fab0] [c000000000147bc4] .perf_event_enable+0x104/0x1c0
  [c000000fb0e3fb60] [c000000000146800] .perf_event_for_each_child+0x60/0x110
  [c000000fb0e3fbf0] [c00000000014a528] .perf_ioctl+0x108/0x3f0
  [c000000fb0e3fca0] [c0000000001d7138] .do_vfs_ioctl+0xb8/0x730
  [c000000fb0e3fd80] [c0000000001d780c] .SyS_ioctl+0x5c/0xb0
  [c000000fb0e3fe30] [c000000000009d54] syscall_exit+0x0/0x98


cheers

Re: Regression in RCU subsystem in latest mainline kernel

[Paul E. McKenney]

On Mon, Jun 17, 2013 at 05:42:13PM +1000, Michael Ellerman wrote:
> On Sat, Jun 15, 2013 at 12:02:21PM +1000, Benjamin Herrenschmidt wrote:
> > On Fri, 2013-06-14 at 17:06 -0400, Steven Rostedt wrote:
> > > I was pretty much able to reproduce this on my PA Semi PPC box. Funny
> > > thing is, when I type on the console, it makes progress. Anyway, it
> > > seems that powerpc has an issue with irq_work(). I'll try to get some
> > > time either tonight or next week to figure it out.
> > 
> > Does this help ?
> > 
> > diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
> > index 5cbcf4d..ea185e0 100644
> > --- a/arch/powerpc/kernel/irq.c
> > +++ b/arch/powerpc/kernel/irq.c
> > @@ -162,7 +162,7 @@ notrace unsigned int __check_irq_replay(void)
> >  	 * in case we also had a rollover while hard disabled
> >  	 */
> >  	local_paca->irq_happened &= ~PACA_IRQ_DEC;
> > -	if (decrementer_check_overflow())
> > +	if ((happened & PACA_IRQ_DEC) || decrementer_check_overflow())
> >  		return 0x900;
> >  
> >  	/* Finally check if an external interrupt happened */
> > 
> 
> This seems to help, but doesn't elminate the RCU stall warnings I am
> seeing. I now see them less often, but not never.
> 
> Stack trace is something like:

Hmmm...  How many CPUs are on your system?  And how much work is
perf_event_for_each_child() having to do here?

If the amount of work is large and your kernel is built with
CONFIG_PREEMPT=n, the RCU CPU stall warning would be expected behavior.
If so, we might need a preemption point in perf_event_for_each_child().

							Thanx, Paul

>   INFO: rcu_sched detected stalls on CPUs/tasks: { 32} (detected by 12, t=21372 jiffies, g=18446744073709551503, c=18446744073709551502, q=1018)
>   Task dump for CPU 32:
>   power8-events   R  running task     4960  2009   1988 0x00000004
>   Call Trace:
>   [c000000fb0e3f910] [c000000fb0e3f9d0] 0xc000000fb0e3f9d0 (unreliable)
>   
>   [c000000fb0e3edc0] [c0000000000b2894] .__run_hrtimer+0xa4/0x2a0
>   [c000000fb0e3ee70] [c0000000000b36d8] .hrtimer_interrupt+0x148/0x320
>   [c000000fb0e3ef80] [c00000000001c754] .timer_interrupt+0x134/0x320
>   [c000000fb0e3f040] [c00000000000a4f4] restore_check_irq_replay+0x68/0xa8
>   --- Exception: 901 at .arch_local_irq_restore+0x24/0x90
>       LR = .__do_softirq+0x100/0x3a0
>   [c000000fb0e3f330] [c0000000000c4784] .vtime_account_irq_enter+0x34/0x70 (unreliable)
>   [c000000fb0e3f3a0] [c000000000089680] .__do_softirq+0x100/0x3a0
>   [c000000fb0e3f4c0] [c000000000089b38] .irq_exit+0xc8/0x110
>   [c000000fb0e3f540] [c00000000001c788] .timer_interrupt+0x168/0x320
>   [c000000fb0e3f600] [c0000000000025cc] decrementer_common+0x14c/0x180
>   --- Exception: 901 at .arch_local_irq_restore+0x74/0x90
>       LR = .arch_local_irq_restore+0x74/0x90
>   [c000000fb0e3f8f0] [c000000fb0e3f970] 0xc000000fb0e3f970 (unreliable)
>   [c000000fb0e3f960] [c0000000000e4ae0] .smp_call_function_single+0x1d0/0x1e0
>   [c000000fb0e3fa10] [c000000000147aa4] .task_function_call+0x54/0x70
>   [c000000fb0e3fab0] [c000000000147bc4] .perf_event_enable+0x104/0x1c0
>   [c000000fb0e3fb60] [c000000000146800] .perf_event_for_each_child+0x60/0x110
>   [c000000fb0e3fbf0] [c00000000014a528] .perf_ioctl+0x108/0x3f0
>   [c000000fb0e3fca0] [c0000000001d7138] .do_vfs_ioctl+0xb8/0x730
>   [c000000fb0e3fd80] [c0000000001d780c] .SyS_ioctl+0x5c/0xb0
>   [c000000fb0e3fe30] [c000000000009d54] syscall_exit+0x0/0x98
> 
> 
> cheers
> 

Re: Regression in RCU subsystem in latest mainline kernel

[Michael Ellerman]

On Tue, Jun 18, 2013 at 09:09:06PM -0700, Paul E. McKenney wrote:
> On Mon, Jun 17, 2013 at 05:42:13PM +1000, Michael Ellerman wrote:
> > On Sat, Jun 15, 2013 at 12:02:21PM +1000, Benjamin Herrenschmidt wrote:
> > > On Fri, 2013-06-14 at 17:06 -0400, Steven Rostedt wrote:
> > > > I was pretty much able to reproduce this on my PA Semi PPC box. Funny
> > > > thing is, when I type on the console, it makes progress. Anyway, it
> > > > seems that powerpc has an issue with irq_work(). I'll try to get some
> > > > time either tonight or next week to figure it out.
> > > 
> > > Does this help ?
> > > 
> > > diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
> > > index 5cbcf4d..ea185e0 100644
> > > --- a/arch/powerpc/kernel/irq.c
> > > +++ b/arch/powerpc/kernel/irq.c
> > > @@ -162,7 +162,7 @@ notrace unsigned int __check_irq_replay(void)
> > >  	 * in case we also had a rollover while hard disabled
> > >  	 */
> > >  	local_paca->irq_happened &= ~PACA_IRQ_DEC;
> > > -	if (decrementer_check_overflow())
> > > +	if ((happened & PACA_IRQ_DEC) || decrementer_check_overflow())
> > >  		return 0x900;
> > >  
> > >  	/* Finally check if an external interrupt happened */
> > > 
> > 
> > This seems to help, but doesn't elminate the RCU stall warnings I am
> > seeing. I now see them less often, but not never.
> > 
> > Stack trace is something like:
 
Hi Paul,

Sorry I've been distracted with other stuff the last week.

> Hmmm...  How many CPUs are on your system?  And how much work is
> perf_event_for_each_child() having to do here?

I'm not 100% sure which system this trace is from. But it would have
~100-128 cpus.

I don't think perf_event_for_each_child() is doing much, there should
only be a single event and the smp_call_function_single() should be
degrading to a local function call.

> If the amount of work is large and your kernel is built with
> CONFIG_PREEMPT=n, the RCU CPU stall warning would be expected behavior.
> If so, we might need a preemption point in perf_event_for_each_child().

I'm using CONFIG_PREEMPT_NONE=y, which I think is what you mean.

Here's another trace from 3.10-rc7 plus a few local patches.

We suspect that the perf enable could be causing a flood of interrupts, but why
that's clogging things up so badly who knows.

INFO: rcu_sched self-detected stall on CPU { 38}  (t=2600 jiffies g=1 c=0 q=9)
cpu 0x26: Vector: 0  at [c0000007ed952b60]
    pc: c00000000014f500: .rcu_check_callbacks+0x400/0x8e0
    lr: c00000000014f500: .rcu_check_callbacks+0x400/0x8e0
    sp: c0000007ed952cd0
   msr: 9000000000009032
  current = 0xc0000007ed8b4a80
  paca    = 0xc00000000fdcab00	 softe: 0	 irq_happened: 0x00
    pid   = 2492, comm = power8-events
enter ? for help
[c0000007ed952e00] c0000000000a3e88 .update_process_times+0x48/0xa0
[c0000007ed952e90] c0000000000fd600 .tick_sched_handle.isra.13+0x40/0xd0
[c0000007ed952f20] c0000000000fd8b4 .tick_sched_timer+0x64/0xa0
[c0000007ed952fc0] c0000000000ca074 .__run_hrtimer+0x94/0x250
[c0000007ed953060] c0000000000cb0f8 .hrtimer_interrupt+0x138/0x3a0
[c0000007ed953150] c00000000001ef54 .timer_interrupt+0x124/0x2f0
[c0000007ed953200] c00000000000a5fc restore_check_irq_replay+0x68/0xa8
--- Exception: 901 (Decrementer) at c0000000000105ec .arch_local_irq_restore+0xc/0x10
[link register   ] c000000000096dac .__do_softirq+0x13c/0x380
[c0000007ed9534f0] c000000000096da0 .__do_softirq+0x130/0x380 (unreliable)
[c0000007ed953610] c000000000097228 .irq_exit+0xd8/0x120
[c0000007ed953690] c00000000001ef88 .timer_interrupt+0x158/0x2f0
[c0000007ed953740] c00000000000a5fc restore_check_irq_replay+0x68/0xa8
--- Exception: 901 (Decrementer) at c00000000010e16c .smp_call_function_single+0x13c/0x230
[c0000007ed953a30] c000000000189c64 .task_function_call+0x54/0x70 (unreliable)
[c0000007ed953ad0] c000000000189d4c .perf_event_enable+0xcc/0x150
[c0000007ed953b70] c000000000187ea0 .perf_event_for_each_child+0x60/0x100
[c0000007ed953c00] c00000000018c5e8 .perf_ioctl+0x108/0x3c0
[c0000007ed953ca0] c000000000226e94 .do_vfs_ioctl+0xc4/0x740
[c0000007ed953d90] c000000000227570 .SyS_ioctl+0x60/0xb0
[c0000007ed953e30] c000000000009e60 syscall_exit+0x0/0x98
--- Exception: c01 (System Call) at 00001fffffee03d0
SP (3fffdf0d2700) is in userspace


cheers

Re: Regression in RCU subsystem in latest mainline kernel

[Benjamin Herrenschmidt]

On Tue, 2013-06-25 at 17:19 +1000, Michael Ellerman wrote:
> Here's another trace from 3.10-rc7 plus a few local patches.
> 
> We suspect that the perf enable could be causing a flood of
> interrupts, but why
> that's clogging things up so badly who knows.

Additionally, perf being potentially NMIs , we might be hitting a bad
case of reentrance in RCU ... hard to tell.

Cheers,
Ben.

Re: Regression in RCU subsystem in latest mainline kernel

[Michael Ellerman]

On Tue, Jun 25, 2013 at 05:19:14PM +1000, Michael Ellerman wrote:
> 
> Here's another trace from 3.10-rc7 plus a few local patches.

And here's another with CONFIG_RCU_CPU_STALL_INFO=y in case that's useful:

PASS running test_pmc5_6_overuse()
INFO: rcu_sched self-detected stall on CPU
	8: (1 GPs behind) idle=8eb/140000000000002/0 softirq=215/220 
	 (t=2100 jiffies g=18446744073709551583 c=18446744073709551582 q=13)
cpu 0x8: Vector: 0  at [c0000003ea03eae0]
    pc: c00000000011d9b0: .rcu_check_callbacks+0x450/0x910
    lr: c00000000011d9b0: .rcu_check_callbacks+0x450/0x910
    sp: c0000003ea03ec40
   msr: 9000000000009032
  current = 0xc0000003ebf9f4a0
  paca    = 0xc00000000fdc2400	 softe: 0	 irq_happened: 0x00
    pid   = 2444, comm = power8-events
enter ? for help
[c0000003ea03ed70] c000000000094cd0 .update_process_times+0x40/0x90
[c0000003ea03ee00] c0000000000df050 .tick_sched_handle.isra.13+0x20/0xa0
[c0000003ea03ee80] c0000000000df2bc .tick_sched_timer+0x5c/0xa0
[c0000003ea03ef20] c0000000000b3728 .__run_hrtimer+0x98/0x260
[c0000003ea03efc0] c0000000000b4738 .hrtimer_interrupt+0x138/0x3c0
[c0000003ea03f0d0] c00000000001cd34 .timer_interrupt+0x124/0x2f0
[c0000003ea03f180] c00000000000a4f4 restore_check_irq_replay+0x68/0xa8
--- Exception: 901 (Decrementer) at c000000000093ad4 .run_timer_softirq+0x74/0x360
[c0000003ea03f580] c000000000089ac4 .__do_softirq+0x174/0x350
[c0000003ea03f6a0] c000000000089ea8 .irq_exit+0xb8/0x100
[c0000003ea03f720] c00000000001cd68 .timer_interrupt+0x158/0x2f0
[c0000003ea03f7d0] c00000000000a4f4 restore_check_irq_replay+0x68/0xa8
--- Exception: 901 (Decrementer) at c00000000014a520 .task_function_call+0x60/0x70
[c0000003ea03fac0] c00000000014a634 .perf_event_enable+0x104/0x1c0 (unreliable)
[c0000003ea03fb70] c0000000001495ec .perf_event_for_each_child+0x5c/0xf0
[c0000003ea03fc00] c00000000014cd78 .perf_ioctl+0x108/0x400
[c0000003ea03fca0] c0000000001d9aa0 .do_vfs_ioctl+0xb0/0x740
[c0000003ea03fd80] c0000000001da188 .SyS_ioctl+0x58/0xb0
[c0000003ea03fe30] c000000000009d54 syscall_exit+0x0/0x98
--- Exception: c01 (System Call) at 00001fffffee03d0
SP (3ffff5e7cc90) is in userspace


cheers

Re: Regression in RCU subsystem in latest mainline kernel

[Paul E. McKenney]

On Tue, Jun 25, 2013 at 05:44:23PM +1000, Michael Ellerman wrote:
> On Tue, Jun 25, 2013 at 05:19:14PM +1000, Michael Ellerman wrote:
> > 
> > Here's another trace from 3.10-rc7 plus a few local patches.
> 
> And here's another with CONFIG_RCU_CPU_STALL_INFO=y in case that's useful:
> 
> PASS running test_pmc5_6_overuse()
> INFO: rcu_sched self-detected stall on CPU
> 	8: (1 GPs behind) idle=8eb/140000000000002/0 softirq=215/220 

So this CPU has been out of action since before the beginning of the
current grace period ("1 GPs behind").  It is not idle, having taken
a pair of nested interrupts from process context (matching the stack
below).  This CPU has take five softirqs since the last grace period
that it noticed, which makes it likely that the loop is within the
softirq handler.

> 	 (t=2100 jiffies g=18446744073709551583 c=18446744073709551582 q=13)

Assuming HZ=100, this stall has been going on  for 21 seconds.  There
is a grace period in progress according to RCU's global state (which
this CPU is not yet aware of).  There are a total of 13 RCU callbacks
queued across the entire system.

If the system is at all responsive, I suggest using ftrace (either from
the boot command line or at runtime) to trace __do_softirq() and
hrtimer_interrupt().

							Thanx, Paul

> cpu 0x8: Vector: 0  at [c0000003ea03eae0]
>     pc: c00000000011d9b0: .rcu_check_callbacks+0x450/0x910
>     lr: c00000000011d9b0: .rcu_check_callbacks+0x450/0x910
>     sp: c0000003ea03ec40
>    msr: 9000000000009032
>   current = 0xc0000003ebf9f4a0
>   paca    = 0xc00000000fdc2400	 softe: 0	 irq_happened: 0x00
>     pid   = 2444, comm = power8-events
> enter ? for help
> [c0000003ea03ed70] c000000000094cd0 .update_process_times+0x40/0x90
> [c0000003ea03ee00] c0000000000df050 .tick_sched_handle.isra.13+0x20/0xa0
> [c0000003ea03ee80] c0000000000df2bc .tick_sched_timer+0x5c/0xa0
> [c0000003ea03ef20] c0000000000b3728 .__run_hrtimer+0x98/0x260
> [c0000003ea03efc0] c0000000000b4738 .hrtimer_interrupt+0x138/0x3c0
> [c0000003ea03f0d0] c00000000001cd34 .timer_interrupt+0x124/0x2f0
> [c0000003ea03f180] c00000000000a4f4 restore_check_irq_replay+0x68/0xa8
> --- Exception: 901 (Decrementer) at c000000000093ad4 .run_timer_softirq+0x74/0x360
> [c0000003ea03f580] c000000000089ac4 .__do_softirq+0x174/0x350
> [c0000003ea03f6a0] c000000000089ea8 .irq_exit+0xb8/0x100
> [c0000003ea03f720] c00000000001cd68 .timer_interrupt+0x158/0x2f0
> [c0000003ea03f7d0] c00000000000a4f4 restore_check_irq_replay+0x68/0xa8
> --- Exception: 901 (Decrementer) at c00000000014a520 .task_function_call+0x60/0x70
> [c0000003ea03fac0] c00000000014a634 .perf_event_enable+0x104/0x1c0 (unreliable)
> [c0000003ea03fb70] c0000000001495ec .perf_event_for_each_child+0x5c/0xf0
> [c0000003ea03fc00] c00000000014cd78 .perf_ioctl+0x108/0x400
> [c0000003ea03fca0] c0000000001d9aa0 .do_vfs_ioctl+0xb0/0x740
> [c0000003ea03fd80] c0000000001da188 .SyS_ioctl+0x58/0xb0
> [c0000003ea03fe30] c000000000009d54 syscall_exit+0x0/0x98
> --- Exception: c01 (System Call) at 00001fffffee03d0
> SP (3ffff5e7cc90) is in userspace
> 
> 
> cheers
> 

Re: Regression in RCU subsystem in latest mainline kernel

[Michael Ellerman]

On Tue, Jun 25, 2013 at 09:03:32AM -0700, Paul E. McKenney wrote:
> On Tue, Jun 25, 2013 at 05:44:23PM +1000, Michael Ellerman wrote:
> > On Tue, Jun 25, 2013 at 05:19:14PM +1000, Michael Ellerman wrote:
> > > 
> > > Here's another trace from 3.10-rc7 plus a few local patches.
> > 
> > And here's another with CONFIG_RCU_CPU_STALL_INFO=y in case that's useful:
> > 
> > PASS running test_pmc5_6_overuse()
> > INFO: rcu_sched self-detected stall on CPU
> > 	8: (1 GPs behind) idle=8eb/140000000000002/0 softirq=215/220 
> 
> So this CPU has been out of action since before the beginning of the
> current grace period ("1 GPs behind").  It is not idle, having taken
> a pair of nested interrupts from process context (matching the stack
> below).  This CPU has take five softirqs since the last grace period
> that it noticed, which makes it likely that the loop is within the
> softirq handler.
> 
> > 	 (t=2100 jiffies g=18446744073709551583 c=18446744073709551582 q=13)
> 
> Assuming HZ=100, this stall has been going on  for 21 seconds.  There
> is a grace period in progress according to RCU's global state (which
> this CPU is not yet aware of).  There are a total of 13 RCU callbacks
> queued across the entire system.
> 
> If the system is at all responsive, I suggest using ftrace (either from
> the boot command line or at runtime) to trace __do_softirq() and
> hrtimer_interrupt().

Thanks for decoding it Paul.

I've narrowed down the test case and I think this is probably just a
case of too many perf interrupts. If I reduce the sampling period by
half the test runs fine.

There is logic in perf to detect an interrupt storm, but for some reason
it's not saving us. I'll dig in there, but I don't think it's an RCU
problem.

cheers

Re: Regression in RCU subsystem in latest mainline kernel

[Paul E. McKenney]

On Wed, Jun 26, 2013 at 06:10:58PM +1000, Michael Ellerman wrote:
> On Tue, Jun 25, 2013 at 09:03:32AM -0700, Paul E. McKenney wrote:
> > On Tue, Jun 25, 2013 at 05:44:23PM +1000, Michael Ellerman wrote:
> > > On Tue, Jun 25, 2013 at 05:19:14PM +1000, Michael Ellerman wrote:
> > > > 
> > > > Here's another trace from 3.10-rc7 plus a few local patches.
> > > 
> > > And here's another with CONFIG_RCU_CPU_STALL_INFO=y in case that's useful:
> > > 
> > > PASS running test_pmc5_6_overuse()
> > > INFO: rcu_sched self-detected stall on CPU
> > > 	8: (1 GPs behind) idle=8eb/140000000000002/0 softirq=215/220 
> > 
> > So this CPU has been out of action since before the beginning of the
> > current grace period ("1 GPs behind").  It is not idle, having taken
> > a pair of nested interrupts from process context (matching the stack
> > below).  This CPU has take five softirqs since the last grace period
> > that it noticed, which makes it likely that the loop is within the
> > softirq handler.
> > 
> > > 	 (t=2100 jiffies g=18446744073709551583 c=18446744073709551582 q=13)
> > 
> > Assuming HZ=100, this stall has been going on  for 21 seconds.  There
> > is a grace period in progress according to RCU's global state (which
> > this CPU is not yet aware of).  There are a total of 13 RCU callbacks
> > queued across the entire system.
> > 
> > If the system is at all responsive, I suggest using ftrace (either from
> > the boot command line or at runtime) to trace __do_softirq() and
> > hrtimer_interrupt().
> 
> Thanks for decoding it Paul.
> 
> I've narrowed down the test case and I think this is probably just a
> case of too many perf interrupts. If I reduce the sampling period by
> half the test runs fine.
> 
> There is logic in perf to detect an interrupt storm, but for some reason
> it's not saving us. I'll dig in there, but I don't think it's an RCU
> problem.

Whew!  ;-)

							Thanx, Paul