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); } _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
