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 D3963C6FA89 for ; Mon, 12 Sep 2022 03:36:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229690AbiILDgG (ORCPT ); Sun, 11 Sep 2022 23:36:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57110 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229593AbiILDdz (ORCPT ); Sun, 11 Sep 2022 23:33:55 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 70B79286D8 for ; Sun, 11 Sep 2022 20:30:57 -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 0E040611AD for ; Mon, 12 Sep 2022 03:30:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 65C36C433D6; Mon, 12 Sep 2022 03:30:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1662953456; bh=VvrHVGJPGYdUEEFBesN7vKP7yviS38V/myhU0+Te0pg=; h=Date:To:From:Subject:From; b=WfNPOLPGrT780mzwnM76lW47vaPzXk5mCdrS0aCq69HkTuAbXOgT23ofUHbDSETxn edto+eyIKgrrz/3WlzViD1pT8I7JAjltSllrBUv3imt3/fuGUktlvGslopecsKwWOf giqVrabrqGZAEuxrHOR3QL5PcPJI1BE8cjqTYu9k= Date: Sun, 11 Sep 2022 20:30:55 -0700 To: mm-commits@vger.kernel.org, willy@infradead.org, christophe.jaillet@wanadoo.fr, akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] mm-mremap_pages-save-a-few-cycles-in-get_dev_pagemap.patch removed from -mm tree Message-Id: <20220912033056.65C36C433D6@smtp.kernel.org> Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org The quilt patch titled Subject: mm/mremap_pages: save a few cycles in get_dev_pagemap() has been removed from the -mm tree. Its filename was mm-mremap_pages-save-a-few-cycles-in-get_dev_pagemap.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: Christophe JAILLET Subject: mm/mremap_pages: save a few cycles in get_dev_pagemap() Date: Fri, 2 Sep 2022 18:39:52 +0200 Use 'percpu_ref_tryget_live_rcu()' instead of 'percpu_ref_tryget_live()' to save a few cycles when it is known that the rcu lock is already taken/released. Link: https://lkml.kernel.org/r/9ef1562a1975371360f3e263856e9f1c5749b656.1662136782.git.christophe.jaillet@wanadoo.fr Signed-off-by: Christophe JAILLET Cc: Matthew Wilcox Signed-off-by: Andrew Morton --- mm/memremap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/memremap.c~mm-mremap_pages-save-a-few-cycles-in-get_dev_pagemap +++ a/mm/memremap.c @@ -454,7 +454,7 @@ struct dev_pagemap *get_dev_pagemap(unsi /* fall back to slow path lookup */ rcu_read_lock(); pgmap = xa_load(&pgmap_array, PHYS_PFN(phys)); - if (pgmap && !percpu_ref_tryget_live(&pgmap->ref)) + if (pgmap && !percpu_ref_tryget_live_rcu(&pgmap->ref)) pgmap = NULL; rcu_read_unlock(); _ Patches currently in -mm which might be from christophe.jaillet@wanadoo.fr are