[GIT PULL] x86 fixes

Ingo Molnar
2009-06-26T19:08:48Z

Linus,

Please pull the latest x86-fixes-for-linus git tree from:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git x86-fixes-for-linus

out-of-topic modifications in x86-fixes-for-linus:
--------------------------------------------------
include/linux/kernel.h # 5211a24: x86: Add sysctl to allow panic on
kernel/sysctl.c # 5211a24: x86: Add sysctl to allow panic on
mm/percpu.c # fa8a709: x86: implement percpu_alloc kerne
# 85ae87c: percpu: fix too lazy vunmap cache

This is somewhat larger than usual due to the somewhat late
percpu/PAT fixes.

Thanks,

Ingo

------------------>
Andreas Herrmann (1):
x86: Set cpu_llc_id on AMD CPUs

Cliff Wickman (1):
x86: Fix uv bau sending buffer initialization

H. Peter Anvin (1):
x86, setup: correct include file in <asm/boot.h>

Hidetoshi Seto (2):
x86, mce: Fix mce resume on 32bit
x86, mce: percpu mcheck_timer should be pinned

Kurt Garloff (1):
x86: Add sysctl to allow panic on IOCK NMI error

Pallipadi, Venkatesh (1):
x86, delay: tsc based udelay should have rdtsc_barrier

Pekka J Enberg (1):
x86: Move init_gbpages() to setup_arch()

Robert P. J. Day (1):
x86, setup: Fix typo "CONFIG_x86_64" in <asm/boot.h>

Tejun Heo (8):
percpu: fix too lazy vunmap cache flushing
x86: fix duplicate free in setup_pcpu_remap() failure path
x86: rename remap percpu first chunk allocator to lpage
x86: prepare setup_pcpu_lpage() for pageattr fix
x86: reorganize cpa_process_alias()
x86: fix pageattr handling for lpage percpu allocator and re-enable it
x86: implement percpu_alloc kernel parameter
x86: ensure percpu lpage doesn't consume too much vmalloc space

Documentation/kernel-parameters.txt | 6 +
arch/x86/include/asm/boot.h | 6 +-
arch/x86/include/asm/percpu.h | 10 ++
arch/x86/kernel/cpu/amd.c | 4 +-
arch/x86/kernel/cpu/mcheck/mce.c | 4 +-
arch/x86/kernel/dumpstack.c | 1 +
arch/x86/kernel/setup.c | 16 +++
arch/x86/kernel/setup_percpu.c | 219 ++++++++++++++++++++++++++---------
arch/x86/kernel/tlb_uv.c | 9 +-
arch/x86/kernel/traps.c | 3 +
arch/x86/lib/delay.c | 3 +
arch/x86/mm/init.c | 17 ---
arch/x86/mm/pageattr.c | 65 +++++++----
arch/x86/power/cpu.c | 2 +-
include/linux/kernel.h | 1 +
kernel/sysctl.c | 8 ++
mm/percpu.c | 24 +++--
17 files changed, 275 insertions(+), 123 deletions(-)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 08def8d..ecad946 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1882,6 +1882,12 @@ and is between 256 and 4096 characters. It is defined in the file
Format: { 0 | 1 }
See arch/parisc/kernel/pdc_chassis.c

+ percpu_alloc= [X86] Select which percpu first chunk allocator to use.
+ Allowed values are one of "lpage", "embed" and "4k".
+ See comments in arch/x86/kernel/setup_percpu.c for
+ details on each allocator. This parameter is primarily
+ for debugging and performance comparison.
+
pf. [PARIDE]
See Documentation/blockdev/paride.txt.

diff --git a/arch/x86/include/asm/boot.h b/arch/x86/include/asm/boot.h
index 418e632..7a10659 100644
--- a/arch/x86/include/asm/boot.h
+++ b/arch/x86/include/asm/boot.h
@@ -8,7 +8,7 @@

#ifdef __KERNEL__

-#include <asm/page_types.h>
+#include <asm/pgtable_types.h>

/* Physical address where kernel should be loaded. */
#define LOAD_PHYSICAL_ADDR ((CONFIG_PHYSICAL_START \
@@ -16,10 +16,10 @@
& ~(CONFIG_PHYSICAL_ALIGN - 1))

/* Minimum kernel alignment, as a power of two */
-#ifdef CONFIG_x86_64
+#ifdef CONFIG_X86_64
#define MIN_KERNEL_ALIGN_LG2 PMD_SHIFT
#else
-#define MIN_KERNEL_ALIGN_LG2 (PAGE_SHIFT+1)
+#define MIN_KERNEL_ALIGN_LG2 (PAGE_SHIFT + THREAD_ORDER)
#endif
#define MIN_KERNEL_ALIGN (_AC(1, UL) << MIN_KERNEL_ALIGN_LG2)

diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index 02ecb30..103f1dd 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -42,6 +42,7 @@

#else /* ...!ASSEMBLY */

+#include <linux/kernel.h>
#include <linux/stringify.h>

#ifdef CONFIG_SMP
@@ -155,6 +156,15 @@ do { \
/* We can use this directly for local CPU (faster). */
DECLARE_PER_CPU(unsigned long, this_cpu_off);

+#ifdef CONFIG_NEED_MULTIPLE_NODES
+void *pcpu_lpage_remapped(void *kaddr);
+#else
+static inline void *pcpu_lpage_remapped(void *kaddr)
+{
+ return NULL;
+}
+#endif
+
#endif /* !__ASSEMBLY__ */

#ifdef CONFIG_SMP
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index e5b27d8..28e5f59 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -258,13 +258,15 @@ static void __cpuinit amd_detect_cmp(struct cpuinfo_x86 *c)
{
#ifdef CONFIG_X86_HT
unsigned bits;
+ int cpu = smp_processor_id();

bits = c->x86_coreid_bits;
-
/* Low order bits define the core id (index of core in socket) */
c->cpu_core_id = c->initial_apicid & ((1 << bits)-1);
/* Convert the initial APIC ID into the socket ID */
c->phys_proc_id = c->initial_apicid >> bits;
+ /* use socket ID also for last level cache */
+ per_cpu(cpu_llc_id, cpu) = c->phys_proc_id;
#endif
}

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 284d1de..af425b8 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -1117,7 +1117,7 @@ static void mcheck_timer(unsigned long data)
*n = min(*n*2, (int)round_jiffies_relative(check_interval*HZ));

t->expires = jiffies + *n;
- add_timer(t);
+ add_timer_on(t, smp_processor_id());
}

static void mce_do_trigger(struct work_struct *work)
@@ -1321,7 +1321,7 @@ static void mce_init_timer(void)
return;
setup_timer(t, mcheck_timer, smp_processor_id());
t->expires = round_jiffies(jiffies + *n);
- add_timer(t);
+ add_timer_on(t, smp_processor_id());
}

/*
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index 95ea5fa..c840571 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -22,6 +22,7 @@
#include "dumpstack.h"

int panic_on_unrecovered_nmi;
+int panic_on_io_nmi;
unsigned int code_bytes = 64;
int kstack_depth_to_print = 3 * STACKSLOTS_PER_LINE;
static int die_counter;
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index be5ae80..de2cab1 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -289,6 +289,20 @@ void * __init extend_brk(size_t size, size_t align)
return ret;
}

+#ifdef CONFIG_X86_64
+static void __init init_gbpages(void)
+{
+ if (direct_gbpages && cpu_has_gbpages)
+ printk(KERN_INFO "Using GB pages for direct mapping\n");
+ else
+ direct_gbpages = 0;
+}
+#else
+static inline void init_gbpages(void)
+{
+}
+#endif
+
static void __init reserve_brk(void)
{
if (_brk_end > _brk_start)
@@ -871,6 +885,8 @@ void __init setup_arch(char **cmdline_p)

reserve_brk();

+ init_gbpages();
+
/* max_pfn_mapped is updated here */
max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
max_pfn_mapped = max_low_pfn_mapped;
diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
index 9c3f082..29a3eef 100644
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -124,7 +124,7 @@ static void * __init pcpu_alloc_bootmem(unsigned int cpu, unsigned long size,
}

/*
- * Remap allocator
+ * Large page remap allocator
*
* This allocator uses PMD page as unit. A PMD page is allocated for
* each cpu and each is remapped into vmalloc area using PMD mapping.
@@ -137,105 +137,185 @@ static void * __init pcpu_alloc_bootmem(unsigned int cpu, unsigned long size,
* better than only using 4k mappings while still being NUMA friendly.
*/
#ifdef CONFIG_NEED_MULTIPLE_NODES
-static size_t pcpur_size __initdata;
-static void **pcpur_ptrs __initdata;
+struct pcpul_ent {
+ unsigned int cpu;
+ void *ptr;
+};
+
+static size_t pcpul_size;
+static struct pcpul_ent *pcpul_map;
+static struct vm_struct pcpul_vm;

-static struct page * __init pcpur_get_page(unsigned int cpu, int pageno)
+static struct page * __init pcpul_get_page(unsigned int cpu, int pageno)
{
size_t off = (size_t)pageno << PAGE_SHIFT;

- if (off >= pcpur_size)
+ if (off >= pcpul_size)
return NULL;

- return virt_to_page(pcpur_ptrs[cpu] + off);
+ return virt_to_page(pcpul_map[cpu].ptr + off);
}

-static ssize_t __init setup_pcpu_remap(size_t static_size)
+static ssize_t __init setup_pcpu_lpage(size_t static_size, bool chosen)
{
- static struct vm_struct vm;
- size_t ptrs_size, dyn_size;
+ size_t map_size, dyn_size;
unsigned int cpu;
+ int i, j;
ssize_t ret;

- /*
- * If large page isn't supported, there's no benefit in doing
- * this. Also, on non-NUMA, embedding is better.
- *
- * NOTE: disabled for now.
- */
- if (true || !cpu_has_pse || !pcpu_need_numa())
+ if (!chosen) {
+ size_t vm_size = VMALLOC_END - VMALLOC_START;
+ size_t tot_size = num_possible_cpus() * PMD_SIZE;
+
+ /* on non-NUMA, embedding is better */
+ if (!pcpu_need_numa())
+ return -EINVAL;
+
+ /* don't consume more than 20% of vmalloc area */
+ if (tot_size > vm_size / 5) {
+ pr_info("PERCPU: too large chunk size %zuMB for "
+ "large page remap\n", tot_size >> 20);
+ return -EINVAL;
+ }
+ }
+
+ /* need PSE */
+ if (!cpu_has_pse) {
+ pr_warning("PERCPU: lpage allocator requires PSE\n");
return -EINVAL;
+ }

/*
* Currently supports only single page. Supporting multiple
* pages won't be too difficult if it ever becomes necessary.
*/
- pcpur_size = PFN_ALIGN(static_size + PERCPU_MODULE_RESERVE +
+ pcpul_size = PFN_ALIGN(static_size + PERCPU_MODULE_RESERVE +
PERCPU_DYNAMIC_RESERVE);
- if (pcpur_size > PMD_SIZE) {
+ if (pcpul_size > PMD_SIZE) {
pr_warning("PERCPU: static data is larger than large page, "
"can't use large page\n");
return -EINVAL;
}
- dyn_size = pcpur_size - static_size - PERCPU_FIRST_CHUNK_RESERVE;
+ dyn_size = pcpul_size - static_size - PERCPU_FIRST_CHUNK_RESERVE;

/* allocate pointer array and alloc large pages */
- ptrs_size = PFN_ALIGN(num_possible_cpus() * sizeof(pcpur_ptrs[0]));
- pcpur_ptrs = alloc_bootmem(ptrs_size);
+ map_size = PFN_ALIGN(num_possible_cpus() * sizeof(pcpul_map[0]));
+ pcpul_map = alloc_bootmem(map_size);

for_each_possible_cpu(cpu) {
- pcpur_ptrs[cpu] = pcpu_alloc_bootmem(cpu, PMD_SIZE, PMD_SIZE);
- if (!pcpur_ptrs[cpu])
+ pcpul_map[cpu].cpu = cpu;
+ pcpul_map[cpu].ptr = pcpu_alloc_bootmem(cpu, PMD_SIZE,
+ PMD_SIZE);
+ if (!pcpul_map[cpu].ptr) {
+ pr_warning("PERCPU: failed to allocate large page "
+ "for cpu%u\n", cpu);
goto enomem;
+ }

/*
- * Only use pcpur_size bytes and give back the rest.
+ * Only use pcpul_size bytes and give back the rest.
*
* Ingo: The 2MB up-rounding bootmem is needed to make
* sure the partial 2MB page is still fully RAM - it's
* not well-specified to have a PAT-incompatible area
* (unmapped RAM, device memory, etc.) in that hole.
*/
- free_bootmem(__pa(pcpur_ptrs[cpu] + pcpur_size),
- PMD_SIZE - pcpur_size);
+ free_bootmem(__pa(pcpul_map[cpu].ptr + pcpul_size),
+ PMD_SIZE - pcpul_size);

- memcpy(pcpur_ptrs[cpu], __per_cpu_load, static_size);
+ memcpy(pcpul_map[cpu].ptr, __per_cpu_load, static_size);
}

/* allocate address and map */
- vm.flags = VM_ALLOC;
- vm.size = num_possible_cpus() * PMD_SIZE;
- vm_area_register_early(&vm, PMD_SIZE);
+ pcpul_vm.flags = VM_ALLOC;
+ pcpul_vm.size = num_possible_cpus() * PMD_SIZE;
+ vm_area_register_early(&pcpul_vm, PMD_SIZE);

for_each_possible_cpu(cpu) {
- pmd_t *pmd;
+ pmd_t *pmd, pmd_v;

- pmd = populate_extra_pmd((unsigned long)vm.addr
- + cpu * PMD_SIZE);
- set_pmd(pmd, pfn_pmd(page_to_pfn(virt_to_page(pcpur_ptrs[cpu])),
- PAGE_KERNEL_LARGE));
+ pmd = populate_extra_pmd((unsigned long)pcpul_vm.addr +
+ cpu * PMD_SIZE);
+ pmd_v = pfn_pmd(page_to_pfn(virt_to_page(pcpul_map[cpu].ptr)),
+ PAGE_KERNEL_LARGE);
+ set_pmd(pmd, pmd_v);
}

/* we're ready, commit */
pr_info("PERCPU: Remapped at %p with large pages, static data "
- "%zu bytes\n", vm.addr, static_size);
+ "%zu bytes\n", pcpul_vm.addr, static_size);

- ret = pcpu_setup_first_chunk(pcpur_get_page, static_size,
+ ret = pcpu_setup_first_chunk(pcpul_get_page, static_size,
PERCPU_FIRST_CHUNK_RESERVE, dyn_size,
- PMD_SIZE, vm.addr, NULL);
- goto out_free_ar;
+ PMD_SIZE, pcpul_vm.addr, NULL);
+
+ /* sort pcpul_map array for pcpu_lpage_remapped() */
+ for (i = 0; i < num_possible_cpus() - 1; i++)
+ for (j = i + 1; j < num_possible_cpus(); j++)
+ if (pcpul_map[i].ptr > pcpul_map[j].ptr) {
+ struct pcpul_ent tmp = pcpul_map[i];
+ pcpul_map[i] = pcpul_map[j];
+ pcpul_map[j] = tmp;
+ }
+
+ return ret;

enomem:
for_each_possible_cpu(cpu)
- if (pcpur_ptrs[cpu])
- free_bootmem(__pa(pcpur_ptrs[cpu]), PMD_SIZE);
- ret = -ENOMEM;
-out_free_ar:
- free_bootmem(__pa(pcpur_ptrs), ptrs_size);
- return ret;
+ if (pcpul_map[cpu].ptr)
+ free_bootmem(__pa(pcpul_map[cpu].ptr), pcpul_size);
+ free_bootmem(__pa(pcpul_map), map_size);
+ return -ENOMEM;
+}
+
+/**
+ * pcpu_lpage_remapped - determine whether a kaddr is in pcpul recycled area
+ * @kaddr: the kernel address in question
+ *
+ * Determine whether @kaddr falls in the pcpul recycled area. This is
+ * used by pageattr to detect VM aliases and break up the pcpu PMD
+ * mapping such that the same physical page is not mapped under
+ * different attributes.
+ *
+ * The recycled area is always at the tail of a partially used PMD
+ * page.
+ *
+ * RETURNS:
+ * Address of corresponding remapped pcpu address if match is found;
+ * otherwise, NULL.
+ */
+void *pcpu_lpage_remapped(void *kaddr)
+{
+ void *pmd_addr = (void *)((unsigned long)kaddr & PMD_MASK);
+ unsigned long offset = (unsigned long)kaddr & ~PMD_MASK;
+ int left = 0, right = num_possible_cpus() - 1;
+ int pos;
+
+ /* pcpul in use at all? */
+ if (!pcpul_map)
+ return NULL;
+
+ /* okay, perform binary search */
+ while (left <= right) {
+ pos = (left + right) / 2;
+
+ if (pcpul_map[pos].ptr < pmd_addr)
+ left = pos + 1;
+ else if (pcpul_map[pos].ptr > pmd_addr)
+ right = pos - 1;
+ else {
+ /* it shouldn't be in the area for the first chunk */
+ WARN_ON(offset < pcpul_size);
+
+ return pcpul_vm.addr +
+ pcpul_map[pos].cpu * PMD_SIZE + offset;
+ }
+ }
+
+ return NULL;
}
#else
-static ssize_t __init setup_pcpu_remap(size_t static_size)
+static ssize_t __init setup_pcpu_lpage(size_t static_size, bool chosen)
{
return -EINVAL;
}
@@ -249,7 +329,7 @@ static ssize_t __init setup_pcpu_remap(size_t static_size)
* mapping so that it can use PMD mapping without additional TLB
* pressure.
*/
-static ssize_t __init setup_pcpu_embed(size_t static_size)
+static ssize_t __init setup_pcpu_embed(size_t static_size, bool chosen)
{
size_t reserve = PERCPU_MODULE_RESERVE + PERCPU_DYNAMIC_RESERVE;

@@ -258,7 +338,7 @@ static ssize_t __init setup_pcpu_embed(size_t static_size)
* this. Also, embedding allocation doesn't play well with
* NUMA.
*/
- if (!cpu_has_pse || pcpu_need_numa())
+ if (!chosen && (!cpu_has_pse || pcpu_need_numa()))
return -EINVAL;

return pcpu_embed_first_chunk(static_size, PERCPU_FIRST_CHUNK_RESERVE,
@@ -308,8 +388,11 @@ static ssize_t __init setup_pcpu_4k(size_t static_size)
void *ptr;

ptr = pcpu_alloc_bootmem(cpu, PAGE_SIZE, PAGE_SIZE);
- if (!ptr)
+ if (!ptr) {
+ pr_warning("PERCPU: failed to allocate "
+ "4k page for cpu%u\n", cpu);
goto enomem;
+ }

memcpy(ptr, __per_cpu_load + i * PAGE_SIZE, PAGE_SIZE);
pcpu4k_pages[j++] = virt_to_page(ptr);
@@ -333,6 +416,16 @@ out_free_ar:
return ret;
}

+/* for explicit first chunk allocator selection */
+static char pcpu_chosen_alloc[16] __initdata;
+
+static int __init percpu_alloc_setup(char *str)
+{
+ strncpy(pcpu_chosen_alloc, str, sizeof(pcpu_chosen_alloc) - 1);
+ return 0;
+}
+early_param("percpu_alloc", percpu_alloc_setup);
+
static inline void setup_percpu_segment(int cpu)
{
#ifdef CONFIG_X86_32
@@ -346,11 +439,6 @@ static inline void setup_percpu_segment(int cpu)
#endif
}

-/*
- * Great future plan:
- * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
- * Always point %gs to its beginning
- */
void __init setup_per_cpu_areas(void)
{
size_t static_size = __per_cpu_end - __per_cpu_start;
@@ -367,9 +455,26 @@ void __init setup_per_cpu_areas(void)
* of large page mappings. Please read comments on top of
* each allocator for details.
*/
- ret = setup_pcpu_remap(static_size);
- if (ret < 0)
- ret = setup_pcpu_embed(static_size);
+ ret = -EINVAL;
+ if (strlen(pcpu_chosen_alloc)) {
+ if (strcmp(pcpu_chosen_alloc, "4k")) {
+ if (!strcmp(pcpu_chosen_alloc, "lpage"))
+ ret = setup_pcpu_lpage(static_size, true);
+ else if (!strcmp(pcpu_chosen_alloc, "embed"))
+ ret = setup_pcpu_embed(static_size, true);
+ else
+ pr_warning("PERCPU: unknown allocator %s "
+ "specified\n", pcpu_chosen_alloc);
+ if (ret < 0)
+ pr_warning("PERCPU: %s allocator failed (%zd), "
+ "falling back to 4k\n",
+ pcpu_chosen_alloc, ret);
+ }
+ } else {
+ ret = setup_pcpu_lpage(static_size, false);
+ if (ret < 0)
+ ret = setup_pcpu_embed(static_size, false);
+ }
if (ret < 0)
ret = setup_pcpu_4k(static_size);
if (ret < 0)
diff --git a/arch/x86/kernel/tlb_uv.c b/arch/x86/kernel/tlb_uv.c
index 124d40c..8ccabb8 100644
--- a/arch/x86/kernel/tlb_uv.c
+++ b/arch/x86/kernel/tlb_uv.c
@@ -711,7 +711,6 @@ uv_activation_descriptor_init(int node, int pnode)
unsigned long pa;
unsigned long m;
unsigned long n;
- unsigned long mmr_image;
struct bau_desc *adp;
struct bau_desc *ad2;

@@ -727,12 +726,8 @@ uv_activation_descriptor_init(int node, int pnode)
n = pa >> uv_nshift;
m = pa & uv_mmask;

- mmr_image = uv_read_global_mmr64(pnode, UVH_LB_BAU_SB_DESCRIPTOR_BASE);
- if (mmr_image) {
- uv_write_global_mmr64(pnode, (unsigned long)
- UVH_LB_BAU_SB_DESCRIPTOR_BASE,
- (n << UV_DESC_BASE_PNODE_SHIFT | m));
- }
+ uv_write_global_mmr64(pnode, UVH_LB_BAU_SB_DESCRIPTOR_BASE,
+ (n << UV_DESC_BASE_PNODE_SHIFT | m));

/*
* initializing all 8 (UV_ITEMS_PER_DESCRIPTOR) descriptors for each
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index a0f48f5..5204332 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -346,6 +346,9 @@ io_check_error(unsigned char reason, struct pt_regs *regs)
printk(KERN_EMERG "NMI: IOCK error (debug interrupt?)\n");
show_registers(regs);

+ if (panic_on_io_nmi)
+ panic("NMI IOCK error: Not continuing");
+
/* Re-enable the IOCK line, wait for a few seconds */
reason = (reason & 0xf) | 8;
outb(reason, 0x61);
diff --git a/arch/x86/lib/delay.c b/arch/x86/lib/delay.c
index f456860..ff485d3 100644
--- a/arch/x86/lib/delay.c
+++ b/arch/x86/lib/delay.c
@@ -55,8 +55,10 @@ static void delay_tsc(unsigned long loops)

preempt_disable();
cpu = smp_processor_id();
+ rdtsc_barrier();
rdtscl(bclock);
for (;;) {
+ rdtsc_barrier();
rdtscl(now);
if ((now - bclock) >= loops)
break;
@@ -78,6 +80,7 @@ static void delay_tsc(unsigned long loops)
if (unlikely(cpu != smp_processor_id())) {
loops -= (now - bclock);
cpu = smp_processor_id();
+ rdtsc_barrier();
rdtscl(bclock);
}
}
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index f53b57e..47ce9a2 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -177,20 +177,6 @@ static int __meminit save_mr(struct map_range *mr, int nr_range,
return nr_range;
}

-#ifdef CONFIG_X86_64
-static void __init init_gbpages(void)
-{
- if (direct_gbpages && cpu_has_gbpages)
- printk(KERN_INFO "Using GB pages for direct mapping\n");
- else
- direct_gbpages = 0;
-}
-#else
-static inline void init_gbpages(void)
-{
-}
-#endif
-
/*
* Setup the direct mapping of the physical memory at PAGE_OFFSET.
* This runs before bootmem is initialized and gets pages directly from
@@ -210,9 +196,6 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,

printk(KERN_INFO "init_memory_mapping: %016lx-%016lx\n", start, end);

- if (!after_bootmem)
- init_gbpages();
-
#if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KMEMCHECK)
/*
* For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages.
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 3cfe9ce..1b734d7 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -11,6 +11,7 @@
#include <linux/interrupt.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>
+#include <linux/pfn.h>

#include <asm/e820.h>
#include <asm/processor.h>
@@ -681,8 +682,9 @@ static int __change_page_attr_set_clr(struct cpa_data *cpa, int checkalias);
static int cpa_process_alias(struct cpa_data *cpa)
{
struct cpa_data alias_cpa;
- int ret = 0;
- unsigned long temp_cpa_vaddr, vaddr;
+ unsigned long laddr = (unsigned long)__va(cpa->pfn << PAGE_SHIFT);
+ unsigned long vaddr, remapped;
+ int ret;

if (cpa->pfn >= max_pfn_mapped)
return 0;
@@ -706,42 +708,55 @@ static int cpa_process_alias(struct cpa_data *cpa)
PAGE_OFFSET + (max_pfn_mapped << PAGE_SHIFT)))) {

alias_cpa = *cpa;
- temp_cpa_vaddr = (unsigned long) __va(cpa->pfn << PAGE_SHIFT);
- alias_cpa.vaddr = &temp_cpa_vaddr;
+ alias_cpa.vaddr = &laddr;
alias_cpa.flags &= ~(CPA_PAGES_ARRAY | CPA_ARRAY);

-
ret = __change_page_attr_set_clr(&alias_cpa, 0);
+ if (ret)
+ return ret;
}

#ifdef CONFIG_X86_64
- if (ret)
- return ret;
/*
- * No need to redo, when the primary call touched the high
- * mapping already:
- */
- if (within(vaddr, (unsigned long) _text, _brk_end))
- return 0;
-
- /*
- * If the physical address is inside the kernel map, we need
+ * If the primary call didn't touch the high mapping already
+ * and the physical address is inside the kernel map, we need
* to touch the high mapped kernel as well:
*/
- if (!within(cpa->pfn, highmap_start_pfn(), highmap_end_pfn()))
- return 0;
+ if (!within(vaddr, (unsigned long)_text, _brk_end) &&
+ within(cpa->pfn, highmap_start_pfn(), highmap_end_pfn())) {
+ unsigned long temp_cpa_vaddr = (cpa->pfn << PAGE_SHIFT) +
+ __START_KERNEL_map - phys_base;
+ alias_cpa = *cpa;
+ alias_cpa.vaddr = &temp_cpa_vaddr;
+ alias_cpa.flags &= ~(CPA_PAGES_ARRAY | CPA_ARRAY);

- alias_cpa = *cpa;
- temp_cpa_vaddr = (cpa->pfn << PAGE_SHIFT) + __START_KERNEL_map - phys_base;
- alias_cpa.vaddr = &temp_cpa_vaddr;
- alias_cpa.flags &= ~(CPA_PAGES_ARRAY | CPA_ARRAY);
+ /*
+ * The high mapping range is imprecise, so ignore the
+ * return value.
+ */
+ __change_page_attr_set_clr(&alias_cpa, 0);
+ }
+#endif

/*
- * The high mapping range is imprecise, so ignore the return value.
+ * If the PMD page was partially used for per-cpu remapping,
+ * the recycled area needs to be split and modified. Because
+ * the area is always proper subset of a PMD page
+ * cpa->numpages is guaranteed to be 1 for these areas, so
+ * there's no need to loop over and check for further remaps.
*/
- __change_page_attr_set_clr(&alias_cpa, 0);
-#endif
- return ret;
+ remapped = (unsigned long)pcpu_lpage_remapped((void *)laddr);
+ if (remapped) {
+ WARN_ON(cpa->numpages > 1);
+ alias_cpa = *cpa;
+ alias_cpa.vaddr = &remapped;
+ alias_cpa.flags &= ~(CPA_PAGES_ARRAY | CPA_ARRAY);
+ ret = __change_page_attr_set_clr(&alias_cpa, 0);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
}

static int __change_page_attr_set_clr(struct cpa_data *cpa, int checkalias)
diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c
index d277ef1..b3d20b9 100644
--- a/arch/x86/power/cpu.c
+++ b/arch/x86/power/cpu.c
@@ -244,7 +244,7 @@ static void __restore_processor_state(struct saved_context *ctxt)
do_fpu_end();
mtrr_ap_init();

-#ifdef CONFIG_X86_32
+#ifdef CONFIG_X86_OLD_MCE
mcheck_init(&boot_cpu_data);
#endif
}
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index fac104e..d6320a3 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -303,6 +303,7 @@ extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in
extern int panic_timeout;
extern int panic_on_oops;
extern int panic_on_unrecovered_nmi;
+extern int panic_on_io_nmi;
extern const char *print_tainted(void);
extern void add_taint(unsigned flag);
extern int test_taint(unsigned flag);
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 62e4ff9..fba42ed 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -744,6 +744,14 @@ static struct ctl_table kern_table[] = {
.proc_handler = &proc_dointvec,
},
{
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "panic_on_io_nmi",
+ .data = &panic_on_io_nmi,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
.ctl_name = KERN_BOOTLOADER_TYPE,
.procname = "bootloader_type",
.data = &bootloader_type,
diff --git a/mm/percpu.c b/mm/percpu.c
index c0b2c1a..b70f2ac 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -549,14 +549,14 @@ static void pcpu_free_area(struct pcpu_chunk *chunk, int freeme)
* @chunk: chunk of interest
* @page_start: page index of the first page to unmap
* @page_end: page index of the last page to unmap + 1
- * @flush: whether to flush cache and tlb or not
+ * @flush_tlb: whether to flush tlb or not
*
* For each cpu, unmap pages [@page_start,@page_end) out of @chunk.
* If @flush is true, vcache is flushed before unmapping and tlb
* after.
*/
static void pcpu_unmap(struct pcpu_chunk *chunk, int page_start, int page_end,
- bool flush)
+ bool flush_tlb)
{
unsigned int last = num_possible_cpus() - 1;
unsigned int cpu;
@@ -569,9 +569,8 @@ static void pcpu_unmap(struct pcpu_chunk *chunk, int page_start, int page_end,
* the whole region at once rather than doing it for each cpu.
* This could be an overkill but is more scalable.
*/
- if (flush)
- flush_cache_vunmap(pcpu_chunk_addr(chunk, 0, page_start),
- pcpu_chunk_addr(chunk, last, page_end));
+ flush_cache_vunmap(pcpu_chunk_addr(chunk, 0, page_start),
+ pcpu_chunk_addr(chunk, last, page_end));

for_each_possible_cpu(cpu)
unmap_kernel_range_noflush(
@@ -579,7 +578,7 @@ static void pcpu_unmap(struct pcpu_chunk *chunk, int page_start, int page_end,
(page_end - page_start) << PAGE_SHIFT);

/* ditto as flush_cache_vunmap() */
- if (flush)
+ if (flush_tlb)
flush_tlb_kernel_range(pcpu_chunk_addr(chunk, 0, page_start),
pcpu_chunk_addr(chunk, last, page_end));
}
@@ -1234,6 +1233,7 @@ static struct page * __init pcpue_get_page(unsigned int cpu, int pageno)
ssize_t __init pcpu_embed_first_chunk(size_t static_size, size_t reserved_size,
ssize_t dyn_size, ssize_t unit_size)
{
+ size_t chunk_size;
unsigned int cpu;

/* determine parameters and allocate */
@@ -1248,11 +1248,15 @@ ssize_t __init pcpu_embed_first_chunk(size_t static_size, size_t reserved_size,
} else
pcpue_unit_size = max_t(size_t, pcpue_size, PCPU_MIN_UNIT_SIZE);

- pcpue_ptr = __alloc_bootmem_nopanic(
- num_possible_cpus() * pcpue_unit_size,
- PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
- if (!pcpue_ptr)
+ chunk_size = pcpue_unit_size * num_possible_cpus();
+
+ pcpue_ptr = __alloc_bootmem_nopanic(chunk_size, PAGE_SIZE,
+ __pa(MAX_DMA_ADDRESS));
+ if (!pcpue_ptr) {
+ pr_warning("PERCPU: failed to allocate %zu bytes for "
+ "embedding\n", chunk_size);
return -ENOMEM;
+ }

/* return the leftover and copy */
for_each_possible_cpu(cpu) {