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mm/hwpoison: introduce put_hwpoison_page to put refcount for memory error handling

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Introduce put_hwpoison_page to put refcount for memory error handling.

Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Suggested-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wanpeng Li 2015-09-08 15:03:15 -07:00 committed by Linus Torvalds
parent 1e0e635be8
commit 94bf4ec84a
2 changed files with 22 additions and 0 deletions
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1
include/linux/mm.h
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@ -2169,6 +2169,7 @@ extern int memory_failure(unsigned long pfn, int trapno, int flags);
extern void memory_failure_queue(unsigned long pfn, int trapno, int flags);
extern int unpoison_memory(unsigned long pfn);
extern int get_hwpoison_page(struct page *page);
extern void put_hwpoison_page(struct page *page);
extern int sysctl_memory_failure_early_kill;
extern int sysctl_memory_failure_recovery;
extern void shake_page(struct page *p, int access);

21
mm/memory-failure.c
View File

@ -934,6 +934,27 @@ int get_hwpoison_page(struct page *page)
}
EXPORT_SYMBOL_GPL(get_hwpoison_page);
/**
* put_hwpoison_page() - Put refcount for memory error handling:
* @page: raw error page (hit by memory error)
*/
void put_hwpoison_page(struct page *page)
{
struct page *head = compound_head(page);
if (PageHuge(head)) {
put_page(head);
return;
}
if (PageTransHuge(head))
if (page != head)
put_page(head);
put_page(page);
}
EXPORT_SYMBOL_GPL(put_hwpoison_page);
/*
* Do all that is necessary to remove user space mappings. Unmap
* the pages and send SIGBUS to the processes if the data was dirty.