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mm/hwpoison: introduce num_poisoned_pages wrappers

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num_poisoned_pages counter will be changed outside mm/memory-failure.c
by a subsequent patch, so this patch prepares wrappers to manipulate it.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Tested-by: Wanpeng Li <wanpeng.li@hotmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Naoya Horiguchi
2015-09-08 15:03:24 -07:00
committed by Linus Torvalds
parent 665d9da7f0
commit 8e30456b6c
2 changed files with 37 additions and 16 deletions
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23
include/linux/swapops.h
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@@ -164,6 +164,9 @@ static inline int is_write_migration_entry(swp_entry_t entry)
#endif
#ifdef CONFIG_MEMORY_FAILURE
extern atomic_long_t num_poisoned_pages __read_mostly;
/*
* Support for hardware poisoned pages
*/
@@ -177,6 +180,26 @@ static inline int is_hwpoison_entry(swp_entry_t entry)
{
return swp_type(entry) == SWP_HWPOISON;
}
static inline void num_poisoned_pages_inc(void)
{
atomic_long_inc(&num_poisoned_pages);
}
static inline void num_poisoned_pages_dec(void)
{
atomic_long_dec(&num_poisoned_pages);
}
static inline void num_poisoned_pages_add(long num)
{
atomic_long_add(num, &num_poisoned_pages);
}
static inline void num_poisoned_pages_sub(long num)
{
atomic_long_sub(num, &num_poisoned_pages);
}
#else
static inline swp_entry_t make_hwpoison_entry(struct page *page)