From patchwork Fri Oct 16 02:47:03 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Morton X-Patchwork-Id: 11840689 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7D0EF15E6 for ; Fri, 16 Oct 2020 02:47:07 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 2EC0220897 for ; Fri, 16 Oct 2020 02:47:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="ICZNOt4H" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2EC0220897 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 1DCE0940042; Thu, 15 Oct 2020 22:47:06 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 18CC7940034; Thu, 15 Oct 2020 22:47:06 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0C8EC940042; Thu, 15 Oct 2020 22:47:06 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0202.hostedemail.com [216.40.44.202]) by kanga.kvack.org (Postfix) with ESMTP id D4A32940034 for ; Thu, 15 Oct 2020 22:47:05 -0400 (EDT) Received: from smtpin06.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 689628249980 for ; Fri, 16 Oct 2020 02:47:05 +0000 (UTC) X-FDA: 77376251610.06.year15_2c1613027219 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin06.hostedemail.com (Postfix) with ESMTP id 43666101E0220 for ; Fri, 16 Oct 2020 02:47:05 +0000 (UTC) X-Spam-Summary: 1,0,0,49d1258eeccf153b,d41d8cd98f00b204,akpm@linux-foundation.org,,RULES_HIT:41:355:379:800:960:967:973:988:989:1260:1345:1359:1381:1431:1437:1534:1541:1711:1730:1747:1777:1792:2393:2525:2559:2563:2682:2685:2859:2902:2933:2937:2939:2942:2945:2947:2951:2954:3022:3138:3139:3140:3141:3142:3352:3865:3866:3867:3868:3870:3872:3934:3936:3938:3941:3944:3947:3950:3953:3956:3959:4321:5007:6119:6261:6653:7576:9025:9545:10004:11026:11658:11914:12043:12048:12296:12297:12438:12517:12519:12555:12679:12895:12986:13069:13138:13231:13311:13357:13846:14181:14384:14721:21080:21451:21627:21939:30054,0,RBL:198.145.29.99:@linux-foundation.org:.lbl8.mailshell.net-62.2.0.100 64.100.201.201;04yrpr1bqdog8szxow7qouf1p95b6op91yjt3zojsam3hq9qg5ij3gz8mnxtqcc.w8scwpsj86g1mhcp5f3ssch8sfk3zzd9in4htcc1haeourqnoe6a794uy3biagy.6-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fp,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:22,LUA _SUMMARY X-HE-Tag: year15_2c1613027219 X-Filterd-Recvd-Size: 2713 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf43.hostedemail.com (Postfix) with ESMTP for ; Fri, 16 Oct 2020 02:47:04 +0000 (UTC) Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B8FA6208C7; Fri, 16 Oct 2020 02:47:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602816424; bh=mAxQLQ3ux7y0A9xcCrK5XRSLZSMB/H6JKeOrydyRUGY=; h=Date:From:To:Subject:In-Reply-To:From; b=ICZNOt4HT/t7yWjNl2l3gylqgS3fTUFBE9dFPKb3YUMQMmmhDN8MBU+iLbG590uON syz3swPPuukHTt9X1eGwRiSXF7ju678hPYeHEMAdyuYMRe+UTKUXZk0ks9Y7626ucw hkI3HDc6S3/4zO/vkisfeOdZzvDQbCJRzBjDi3EM= Date: Thu, 15 Oct 2020 19:47:03 -0700 From: Andrew Morton To: akpm@linux-foundation.org, linmiaohe@huawei.com, linux-mm@kvack.org, mm-commits@vger.kernel.org, torvalds@linux-foundation.org Subject: [patch 092/156] mm: use helper function put_write_access() Message-ID: <20201016024703.N713x0Y3v%akpm@linux-foundation.org> In-Reply-To: <20201015192732.f448da14e9854c7cb7299956@linux-foundation.org> User-Agent: s-nail v14.8.16 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: Miaohe Lin Subject: mm: use helper function put_write_access() In commit 1da177e4c3f4 ("Linux-2.6.12-rc2"), the helper put_write_access() came with the atomic_dec operation of the i_writecount field. But it forgot to use this helper in __vma_link_file() and dup_mmap(). Link: https://lkml.kernel.org/r/20200924115235.5111-1-linmiaohe@huawei.com Signed-off-by: Miaohe Lin Signed-off-by: Andrew Morton --- kernel/fork.c | 2 +- mm/mmap.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) --- a/kernel/fork.c~mm-use-helper-function-put_write_access +++ a/kernel/fork.c @@ -556,7 +556,7 @@ static __latent_entropy int dup_mmap(str get_file(file); if (tmp->vm_flags & VM_DENYWRITE) - atomic_dec(&inode->i_writecount); + put_write_access(inode); i_mmap_lock_write(mapping); if (tmp->vm_flags & VM_SHARED) mapping_allow_writable(mapping); --- a/mm/mmap.c~mm-use-helper-function-put_write_access +++ a/mm/mmap.c @@ -619,7 +619,7 @@ static void __vma_link_file(struct vm_ar struct address_space *mapping = file->f_mapping; if (vma->vm_flags & VM_DENYWRITE) - atomic_dec(&file_inode(file)->i_writecount); + put_write_access(file_inode(file)); if (vma->vm_flags & VM_SHARED) mapping_allow_writable(mapping);