From patchwork Fri Jun 3 14:35:55 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xiongwei Song X-Patchwork-Id: 12869138 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0123CC433EF for ; Fri, 3 Jun 2022 14:36:53 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 07B406B0071; Fri, 3 Jun 2022 10:36:53 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 002188D0002; Fri, 3 Jun 2022 10:36:52 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id DDFA38D0001; Fri, 3 Jun 2022 10:36:52 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id C91B66B0071 for ; Fri, 3 Jun 2022 10:36:52 -0400 (EDT) Received: from smtpin25.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id A296B34ECA for ; Fri, 3 Jun 2022 14:36:52 +0000 (UTC) X-FDA: 79537176264.25.CC6C783 Received: from pv50p00im-ztdg10021801.me.com (pv50p00im-ztdg10021801.me.com [17.58.6.56]) by imf06.hostedemail.com (Postfix) with ESMTP id 3B388180008 for ; Fri, 3 Jun 2022 14:36:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=me.com; s=1a1hai; t=1654267011; bh=Ucku8Js4PlaZ5zvvbiyRmooKUGTiNzqZWqTg6PWHaUw=; h=From:To:Subject:Date:Message-Id:MIME-Version; b=doncoDJ9Dt9FBjBh8fbkK/v4fsILBZQDp5iNFxevPTgjmoAifxkoSU/bfffzGJimR 26tAQ4O3HN0A1TbauRcfHdPnjC6i+Xlm3Da4b3ZlloxQ7q4I1TRjxANvsJtkK1Z6Uw /fmMjb1uUvrQNSBi8nAYcYpC2MNdWJNBAV+R1BC6glMJ44LqyvUlHrM2V/XVw5FEvI +BOK3GZ4f9Ol6r/kA7KEt/G7y6K8GKul9yRbSTo7G6wvFyWghVq6XTKzbt/RBDNPWS TSro1XZIkSjp8C49rAmVisEiF1FTc4FuL91mc8nizIAaqN2GNncersJV5paOa6lzJz EU/NMCCv/1bkA== Received: from xiongwei.. (pv50p00im-dlb-asmtp-mailmevip.me.com [17.56.9.10]) by pv50p00im-ztdg10021801.me.com (Postfix) with ESMTPSA id 33B3A160308; Fri, 3 Jun 2022 14:36:25 +0000 (UTC) From: sxwjean@me.com To: cl@linux.com, penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com, akpm@linux-foundation.org, vbabka@suse.cz, roman.gushchin@linux.dev, 42.hyeyoo@gmail.com, songmuchun@bytedance.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Xiongwei Song Subject: [PATCH v2] mm/slub: Simplify __kmem_cache_alias() Date: Fri, 3 Jun 2022 22:35:55 +0800 Message-Id: <20220603143555.41914-1-sxwjean@me.com> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.517,18.0.874 definitions=2022-06-03_05:2022-06-02,2022-06-03 signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 mlxscore=0 mlxlogscore=697 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-2009150000 definitions=main-2206030064 X-Stat-Signature: ighrtgu5bn9n6z68ga895d3ab3nfd6og Authentication-Results: imf06.hostedemail.com; dkim=pass header.d=me.com header.s=1a1hai header.b=doncoDJ9; dmarc=pass (policy=quarantine) header.from=me.com; spf=pass (imf06.hostedemail.com: domain of sxwjean@me.com designates 17.58.6.56 as permitted sender) smtp.mailfrom=sxwjean@me.com X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 3B388180008 X-HE-Tag: 1654267008-749951 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Xiongwei Song There is no need to do anything if sysfs_slab_alias() return nonzero value after getting a mergeable cache. Signed-off-by: Xiongwei Song Reviewed-by: Muchun Song --- v2: Collect Reviewed-by tag from Muchun. --- mm/slub.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index d8d5abf49f5f..9444277d669a 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -4861,6 +4861,9 @@ __kmem_cache_alias(const char *name, unsigned int size, unsigned int align, s = find_mergeable(size, align, flags, name, ctor); if (s) { + if (sysfs_slab_alias(s, name)) + return NULL; + s->refcount++; /* @@ -4869,11 +4872,6 @@ __kmem_cache_alias(const char *name, unsigned int size, unsigned int align, */ s->object_size = max(s->object_size, size); s->inuse = max(s->inuse, ALIGN(size, sizeof(void *))); - - if (sysfs_slab_alias(s, name)) { - s->refcount--; - s = NULL; - } } return s;