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mm: hwpoison: change PageHWPoison behavior on hugetlb pages

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We'd like to narrow down the error region in memory error on hugetlb
pages.  However, currently we set PageHWPoison flags on all subpages in
the error hugepage and add # of subpages to num_hwpoison_pages, which
doesn't fit our purpose.

So this patch changes the behavior and we only set PageHWPoison on the
head page then increase num_hwpoison_pages only by 1.  This is a
preparation for narrow-down part which comes in later patches.

Link: http://lkml.kernel.org/r/1496305019-5493-4-git-send-email-n-horiguchi@ah.jp.nec.com
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.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
2017-07-10 15:47:38 -07:00
committed by Linus Torvalds
parent 09612fa653
commit b37ff71cc6
2 changed files with 24 additions and 72 deletions
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9
include/linux/swapops.h
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@@ -196,15 +196,6 @@ 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)