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Merge branch 'for-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 

Pull percpu update from Tejun Heo:
 "This includes just one patch to reject non-power-of-2 alignments and
  trigger warning. Interestingly, this actually caught a bug in XEN
  ARM64"

* 'for-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu:
  percpu: ensure the requested alignment is power of two
This commit is contained in:
Linus Torvalds 2016-12-13 12:34:47 -08:00
parent b78b499a67 3ca45a46f8
commit e6efef7260
2 changed files with 3 additions and 1 deletions
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1
include/linux/kernel.h
View File

@ -45,6 +45,7 @@
#define REPEAT_BYTE(x) ((~0ul / 0xff) * (x))
/* @a is a power of 2 value */
#define ALIGN(x, a) __ALIGN_KERNEL((x), (a))
#define __ALIGN_MASK(x, mask) __ALIGN_KERNEL_MASK((x), (mask))
#define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a)))

3
mm/percpu.c
View File

@ -886,7 +886,8 @@ static void __percpu *pcpu_alloc(size_t size, size_t align, bool reserved,
size = ALIGN(size, 2);
if (unlikely(!size || size > PCPU_MIN_UNIT_SIZE || align > PAGE_SIZE)) {
if (unlikely(!size || size > PCPU_MIN_UNIT_SIZE || align > PAGE_SIZE ||
!is_power_of_2(align))) {
WARN(true, "illegal size (%zu) or align (%zu) for percpu allocation\n",
size, align);
return NULL;