Introduce put_hwpoison_page to put refcount for memory
error handling.
Suggested-by: Naoya Horiguchi <n-horigu...@ah.jp.nec.com>
Signed-off-by: Wanpeng Li <wanpeng...@hotmail.com>
---
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
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