* Re: [RFC][PATCH v2 1/2] sched: Avoid placing RT threads on cores handling long softirqs
[not found] <20220822190501.2171100-2-jstultz@google.com>
@ 2022-08-24 8:03 ` kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2022-08-24 8:03 UTC (permalink / raw)
To: John Stultz; +Cc: llvm, kbuild-all
Hi John,
[FYI, it's a private test report for your RFC patch.]
[auto build test ERROR on linus/master]
[also build test ERROR on v6.0-rc2 next-20220824]
[cannot apply to tip/sched/core]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/John-Stultz/Softirq-rt-Optimizations/20220823-030642
base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 072e51356cd5a4a1c12c1020bc054c99b98333df
config: s390-randconfig-r003-20220824 (https://download.01.org/0day-ci/archive/20220824/202208241540.4avi4iGS-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project d00e97df0fe8c67f694c4d027297f4382ce72b38)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install s390 cross compiling tool for clang build
# apt-get install binutils-s390x-linux-gnu
# https://github.com/intel-lab-lkp/linux/commit/1d1c0ba7867315d6327259cbf7a561248330038b
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review John-Stultz/Softirq-rt-Optimizations/20220823-030642
git checkout 1d1c0ba7867315d6327259cbf7a561248330038b
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash
If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>
All errors (new ones prefixed by >>):
In file included from kernel/sched/build_policy.c:34:
In file included from kernel/sched/sched.h:63:
In file included from include/linux/tick.h:8:
In file included from include/linux/clockchips.h:14:
In file included from include/linux/clocksource.h:22:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __raw_readb(PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:37:59: note: expanded from macro '__le16_to_cpu'
#define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
^
include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
#define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
^
In file included from kernel/sched/build_policy.c:34:
In file included from kernel/sched/sched.h:63:
In file included from include/linux/tick.h:8:
In file included from include/linux/clockchips.h:14:
In file included from include/linux/clocksource.h:22:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^
include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
#define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
^
In file included from kernel/sched/build_policy.c:34:
In file included from kernel/sched/sched.h:63:
In file included from include/linux/tick.h:8:
In file included from include/linux/clockchips.h:14:
In file included from include/linux/clocksource.h:22:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writeb(value, PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:692:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:700:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:708:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:717:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:726:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:735:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
In file included from kernel/sched/build_policy.c:45:
>> kernel/sched/rt.c:1612:33: error: no member named '__softirq_pending' in 'struct irq_stat'
per_cpu(irq_stat, cpu).__softirq_pending;
~~~~~~~~~~~~~~~~~~~~~~ ^
12 warnings and 1 error generated.
vim +1612 kernel/sched/rt.c
1601
1602 #ifdef CONFIG_RT_SOFTIRQ_OPTIMIZATION
1603 /*
1604 * Return whether the task on the given cpu is currently non-preemptible
1605 * while handling a potentially long softirq, or if the task is likely
1606 * to block preemptions soon because it is a ksoftirq thread that is
1607 * handling slow softirq.
1608 */
1609 static bool task_may_preempt(struct task_struct *task, int cpu)
1610 {
1611 u32 softirqs = per_cpu(active_softirqs, cpu) |
> 1612 per_cpu(irq_stat, cpu).__softirq_pending;
1613
1614 struct task_struct *cpu_ksoftirqd = per_cpu(ksoftirqd, cpu);
1615 struct task_struct *curr;
1616 struct rq *rq = cpu_rq(cpu);
1617 int ret;
1618
1619 rcu_read_lock();
1620 curr = READ_ONCE(rq->curr); /* unlocked access */
1621 ret = !((softirqs & LONG_SOFTIRQ_MASK) &&
1622 (curr == cpu_ksoftirqd ||
1623 preempt_count() & SOFTIRQ_MASK));
1624 rcu_read_unlock();
1625 return ret;
1626 }
1627 #else
1628 static bool task_may_preempt(struct task_struct *task, int cpu)
1629 {
1630 return true;
1631 }
1632 #endif /* CONFIG_RT_SOFTIRQ_OPTIMIZATION */
1633
--
0-DAY CI Kernel Test Service
https://01.org/lkp
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