The patch titled
Subject: mm/hwpoison: introduce put_hwpoison_page to put refcount for memory error handling
has been added to the -mm tree. Its filename is
mm-hwpoison-introduce-put_hwpoison_page-to-put-refcount-for-memory-error-handling.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-hwpoison-introduce-put_hwpoison_page-to-put-refcount-for-memory-error-handling.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-hwpoison-introduce-put_hwpoison_page-to-put-refcount-for-memory-error-handling.patch
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------------------------------------------------------
From: Wanpeng Li <wanpeng.li@xxxxxxxxxxx>
Subject: 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@xxxxxxxxxxx>
Suggested-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 1 +
mm/memory-failure.c | 21 +++++++++++++++++++++
2 files changed, 22 insertions(+)
diff -puN include/linux/mm.h~mm-hwpoison-introduce-put_hwpoison_page-to-put-refcount-for-memory-error-handling include/linux/mm.h
--- a/include/linux/mm.h~mm-hwpoison-introduce-put_hwpoison_page-to-put-refcount-for-memory-error-handling
+++ a/include/linux/mm.h
@@ -2146,6 +2146,7 @@ extern int memory_failure(unsigned long
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 -puN mm/memory-failure.c~mm-hwpoison-introduce-put_hwpoison_page-to-put-refcount-for-memory-error-handling mm/memory-failure.c
--- a/mm/memory-failure.c~mm-hwpoison-introduce-put_hwpoison_page-to-put-refcount-for-memory-error-handling
+++ a/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.
_
Patches currently in -mm which might be from wanpeng.li@xxxxxxxxxxx are
mm-hwpoison-fix-page-refcount-of-unkown-non-lru-page.patch
mm-hwpoison-fix-fail-isolate-hugetlbfs-page-w-refcount-held.patch
mm-hwpoison-fix-panic-due-to-split-huge-zero-page.patch
mm-hwpoison-fix-fail-to-split-thp-w-refcount-held.patch
mm-hwpoison-fix-pagehwpoison-test-set-race.patch
mm-hwpoison-introduce-put_hwpoison_page-to-put-refcount-for-memory-error-handling.patch
mm-hwpoison-introduce-put_hwpoison_page-to-put-refcount-for-memory-error-handling-fix.patch
mm-hwpoison-fix-refcount-of-thp-head-page-in-no-injection-case.patch
mm-hwpoison-replace-most-of-put_page-in-memory-error-handling-by-put_hwpoison_page.patch
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