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authorWanpeng Li <wanpeng.li@hotmail.com>2015-09-08 15:03:15 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-08 15:35:28 -0700
commit94bf4ec84a84d3ab2513b4e681fd3d083328d76d (patch)
treeac1df0b30e8aee2c6a67d857ab06d55d00bc6885
parent1e0e635be82132167a134b5a9c884e70e61f8373 (diff)
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.h1
-rw-r--r--mm/memory-failure.c21
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.