From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4B1DFC433F5 for ; Fri, 25 Mar 2022 01:32:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1357389AbiCYBdz (ORCPT ); Thu, 24 Mar 2022 21:33:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38268 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1357457AbiCYBdM (ORCPT ); Thu, 24 Mar 2022 21:33:12 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BD1D2BF50F for ; Thu, 24 Mar 2022 18:31:17 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 5A356618F6 for ; Fri, 25 Mar 2022 01:31:17 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B4E3BC340EC; Fri, 25 Mar 2022 01:31:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1648171876; bh=Mmrc8+0QfbS4ie9WQxkhqxqOstNPLZ9P6n0NDU6MHZk=; h=Date:To:From:Subject:From; b=nWXe6VDMRAcWOwUtPc1xLFIgRKL2b5BEaoJXFaEM3jDzvKxFxOhTHXG64blWG1FGp rHeht7eNzr3AaLTyys18B8G+de6OId5a7IESnphSqvqQMyvFnLL9rRCuUGKoHYHVJ6 vlepBaryVOF5sar8AkHrwGbQ6x6akcf1/Rxqz118= Date: Thu, 24 Mar 2022 18:31:16 -0700 To: mm-commits@vger.kernel.org, peterz@infradead.org, mgorman@suse.de, andreyknvl@gmail.com, pcc@google.com, akpm@linux-foundation.org From: Andrew Morton Subject: [merged] mm-mmzonec-use-try_cmpxchg-in-page_cpupid_xchg_last.patch removed from -mm tree Message-Id: <20220325013116.B4E3BC340EC@smtp.kernel.org> Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org The patch titled Subject: mm/mmzone.c: use try_cmpxchg() in page_cpupid_xchg_last() has been removed from the -mm tree. Its filename was mm-mmzonec-use-try_cmpxchg-in-page_cpupid_xchg_last.patch This patch was dropped because it was merged into mainline or a subsystem tree ------------------------------------------------------ From: Peter Collingbourne Subject: mm/mmzone.c: use try_cmpxchg() in page_cpupid_xchg_last() This will let us avoid an additional read from page->flags when retrying the compare-exchange on some architectures. Link: https://lkml.kernel.org/r/20220120011200.1322836-1-pcc@google.com Link: https://linux-review.googlesource.com/id/I2e1f5b5b080ac9c4e0eb7f98768dba6fd7821693 Signed-off-by: Peter Collingbourne Suggested-by: Peter Zijlstra Cc: Andrey Konovalov Cc: Mel Gorman Signed-off-by: Andrew Morton --- mm/mmzone.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) --- a/mm/mmzone.c~mm-mmzonec-use-try_cmpxchg-in-page_cpupid_xchg_last +++ a/mm/mmzone.c @@ -89,13 +89,14 @@ int page_cpupid_xchg_last(struct page *p unsigned long old_flags, flags; int last_cpupid; + old_flags = READ_ONCE(page->flags); do { - old_flags = flags = page->flags; - last_cpupid = page_cpupid_last(page); + flags = old_flags; + last_cpupid = (flags >> LAST_CPUPID_PGSHIFT) & LAST_CPUPID_MASK; flags &= ~(LAST_CPUPID_MASK << LAST_CPUPID_PGSHIFT); flags |= (cpupid & LAST_CPUPID_MASK) << LAST_CPUPID_PGSHIFT; - } while (unlikely(cmpxchg(&page->flags, old_flags, flags) != old_flags)); + } while (unlikely(!try_cmpxchg(&page->flags, &old_flags, flags))); return last_cpupid; } _ Patches currently in -mm which might be from pcc@google.com are kasan-update-function-name-in-comments.patch