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| author | Wanpeng Li <wanpeng.li@hotmail.com> | 2015-09-09 01:03:15 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-09-09 01:35:28 +0300 |
| commit | 94bf4ec84a84d3ab2513b4e681fd3d083328d76d (patch) | |
| tree | ac1df0b30e8aee2c6a67d857ab06d55d00bc6885 | |
| parent | 1e0e635be82132167a134b5a9c884e70e61f8373 (diff) | |
| download | linux-94bf4ec84a84d3ab2513b4e681fd3d083328d76d.tar.xz | |
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: 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>
| -rw-r--r-- | include/linux/mm.h | 1 | ||||
| -rw-r--r-- | mm/memory-failure.c | 21 |
2 files changed, 22 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index bab8ff89da50..11df1a8ea38b 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -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); diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 863544d84a09..5ceb8253e33b 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -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. |