Introduce put_hwpoison_page to put refcount for memory error handling. Suggested-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> Signed-off-by: Wanpeng Li <wanpeng.li@xxxxxxxxxxx> --- include/linux/mm.h | 1 + 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 554b0f0..c0a0b9f 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2103,6 +2103,7 @@ 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 e0eb7ab..fa9aa21 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -922,6 +922,27 @@ 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. -- 1.7.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx"> email@xxxxxxxxx </a>