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[2603:800c:1a02:1bae:e24f:43ff:fee6:449f]) by smtp.gmail.com with ESMTPSA id q5sm4512106pjd.30.2021.09.13.10.03.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Sep 2021 10:03:07 -0700 (PDT) Date: Mon, 13 Sep 2021 07:03:06 -1000 From: Tejun Heo To: Marco Elver Cc: Andrew Morton , Shuah Khan , Lai Jiangshan , Andrey Konovalov , Walter Wu , Sebastian Andrzej Siewior , Thomas Gleixner , Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , Vijayanand Jitta , Vinayak Menon , "Gustavo A. R. Silva" , kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Aleksandr Nogikh , Taras Madan Subject: Re: [PATCH v2 6/6] workqueue, kasan: avoid alloc_pages() when recording stack Message-ID: References: <20210913112609.2651084-1-elver@google.com> <20210913112609.2651084-7-elver@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210913112609.2651084-7-elver@google.com> X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 2CE09801A89C X-Stat-Signature: pr3p8n6qs9c3sz5kpekyigjtxoqwdusk Authentication-Results: imf06.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=jH+jgXCD; spf=pass (imf06.hostedemail.com: domain of htejun@gmail.com designates 209.85.215.178 as permitted sender) smtp.mailfrom=htejun@gmail.com; dmarc=fail reason="SPF not aligned (relaxed), DKIM not aligned (relaxed)" header.from=kernel.org (policy=none) X-HE-Tag: 1631552589-392405 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000001, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Sep 13, 2021 at 01:26:09PM +0200, Marco Elver wrote: > While there is an increased risk of failing to insert the stack trace, > this is typically unlikely, especially if the same insertion had already > succeeded previously (stack depot hit). For frequent calls from the same > location, it therefore becomes extremely unlikely that > kasan_record_aux_stack_noalloc() fails. > > Link: https://lkml.kernel.org/r/20210902200134.25603-1-skhan@linuxfoundation.org > Reported-by: Shuah Khan > Signed-off-by: Marco Elver > Tested-by: Shuah Khan > Acked-by: Sebastian Andrzej Siewior Acked-by: Tejun Heo Please feel free to route with the rest of series or if you want me to take these through the wq tree, please let me know. Thanks. -- tejun