The patch titled
Subject: mm/page_ref: use atomic_set_release in page_ref_unfreeze
has been added to the -mm tree. Its filename is
mm-page_ref-use-atomic_set_release-in-page_ref_unfreeze.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-page_ref-use-atomic_set_release-in-page_ref_unfreeze.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-page_ref-use-atomic_set_release-in-page_ref_unfreeze.patch
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------------------------------------------------------
From: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
Subject: mm/page_ref: use atomic_set_release in page_ref_unfreeze
page_ref_unfreeze() has exactly that semantic. No functional changes:
just minus one barrier and proper handling of PPro errata.
Link: http://lkml.kernel.org/r/151844393004.210639.4672319312617954272.stgit@buzz
Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/page_ref.h | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff -puN include/linux/page_ref.h~mm-page_ref-use-atomic_set_release-in-page_ref_unfreeze include/linux/page_ref.h
--- a/include/linux/page_ref.h~mm-page_ref-use-atomic_set_release-in-page_ref_unfreeze
+++ a/include/linux/page_ref.h
@@ -175,8 +175,7 @@ static inline void page_ref_unfreeze(str
VM_BUG_ON_PAGE(page_count(page) != 0, page);
VM_BUG_ON(count == 0);
- smp_mb();
- atomic_set(&page->_refcount, count);
+ atomic_set_release(&page->_refcount, count);
if (page_ref_tracepoint_active(__tracepoint_page_ref_unfreeze))
__page_ref_unfreeze(page, count);
}
_
Patches currently in -mm which might be from khlebnikov@xxxxxxxxxxxxxx are
mm-page_ref-use-atomic_set_release-in-page_ref_unfreeze.patch
mm-huge_memoryc-reorder-operations-in-__split_huge_page_tail.patch
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