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Commit 94bf4ec8 authored by Wanpeng Li's avatar Wanpeng Li Committed by Linus Torvalds
Browse files

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



Introduce put_hwpoison_page to put refcount for memory error handling.

Signed-off-by: default avatarWanpeng Li <wanpeng.li@hotmail.com>
Suggested-by: default avatarNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: default avatarNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 1e0e635b

include/linux/mm.h

+1 −0
Original line number Diff line number Diff line
@@ -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);

mm/memory-failure.c

+21 −0
Original line number Diff line number Diff line
@@ -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.