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 X-Spam-Level: X-Spam-Status: No, score=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9133DC432BE for ; Wed, 1 Sep 2021 08:10:21 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 391C060238 for ; Wed, 1 Sep 2021 08:10:21 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 391C060238 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id CA8F96B006C; 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Wed, 1 Sep 2021 08:10:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1630483818; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=GHTY9I51VG4C7aTV8oDtjnPiG0Wf5YKwTyayXS/Ire4=; b=ILCGDl0sDjQqHhpMDxu05cHf7kKxPWynTyaTuP+hTxgRpsq4gZpONxzwWlqt958hOfg9WW 9vnj3ooGOTm2ZAE/21dJtE2RsDuNMuymiwoJcMrmIwatyxasL1Pqg+qjh7d+lMJJUW5jKK tJv/0rqvwKPw4Kc9auN8DbvUSd+WRWo= Received: from suse.cz (mhocko.udp.ovpn2.prg.suse.de [10.100.201.86]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by relay2.suse.de (Postfix) with ESMTPS id 57C29A3B9B; Wed, 1 Sep 2021 08:10:18 +0000 (UTC) Date: Wed, 1 Sep 2021 10:10:17 +0200 From: Michal Hocko To: Suren Baghdasaryan Cc: akpm@linux-foundation.org, ccross@google.com, sumit.semwal@linaro.org, dave.hansen@intel.com, keescook@chromium.org, willy@infradead.org, kirill.shutemov@linux.intel.com, vbabka@suse.cz, hannes@cmpxchg.org, corbet@lwn.net, viro@zeniv.linux.org.uk, rdunlap@infradead.org, kaleshsingh@google.com, peterx@redhat.com, rppt@kernel.org, peterz@infradead.org, catalin.marinas@arm.com, vincenzo.frascino@arm.com, chinwen.chang@mediatek.com, axelrasmussen@google.com, aarcange@redhat.com, jannh@google.com, apopple@nvidia.com, jhubbard@nvidia.com, yuzhao@google.com, will@kernel.org, fenghua.yu@intel.com, thunder.leizhen@huawei.com, hughd@google.com, feng.tang@intel.com, jgg@ziepe.ca, guro@fb.com, tglx@linutronix.de, krisman@collabora.com, chris.hyser@oracle.com, pcc@google.com, ebiederm@xmission.com, axboe@kernel.dk, legion@kernel.org, eb@emlix.com, songmuchun@bytedance.com, viresh.kumar@linaro.org, thomascedeno@google.com, sashal@kernel.org, cxfcosmos@gmail.com, linux@rasmusvillemoes.dk, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, kernel-team@android.com Subject: Re: [PATCH v8 2/3] mm: add a field to store names for private anonymous memory Message-ID: References: <20210827191858.2037087-1-surenb@google.com> <20210827191858.2037087-3-surenb@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210827191858.2037087-3-surenb@google.com> Authentication-Results: imf04.hostedemail.com; dkim=pass header.d=suse.com header.s=susede1 header.b=ILCGDl0s; dmarc=pass (policy=quarantine) header.from=suse.com; spf=pass (imf04.hostedemail.com: domain of mhocko@suse.com designates 195.135.220.28 as permitted sender) smtp.mailfrom=mhocko@suse.com X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 06B165000097 X-Stat-Signature: kefcg7a85ug34std5b4rme5b7ss8ao8b X-HE-Tag: 1630483819-243786 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: On Fri 27-08-21 12:18:57, Suren Baghdasaryan wrote: [...] > +static void replace_vma_anon_name(struct vm_area_struct *vma, const char *name) > +{ > + if (!name) { > + free_vma_anon_name(vma); > + return; > + } > + > + if (vma->anon_name) { > + /* Should never happen, to dup use dup_vma_anon_name() */ > + WARN_ON(vma->anon_name == name); What is the point of this warning? > + > + /* Same name, nothing to do here */ > + if (!strcmp(name, vma->anon_name)) > + return; > + > + free_vma_anon_name(vma); > + } > + vma->anon_name = kstrdup(name, GFP_KERNEL); > +} -- Michal Hocko SUSE Labs