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[71.184.117.43]) by smtp.gmail.com with ESMTPSA id v7sm17304099qtk.89.2020.01.02.09.16.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 02 Jan 2020 09:16:29 -0800 (PST) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable From: Qian Cai Mime-Version: 1.0 (1.0) Subject: Re: [PATCH] char/random: silence a lockdep splat with printk() Date: Thu, 2 Jan 2020 12:16:28 -0500 Message-Id: <00116950-7DFB-4F93-959A-06D63E8FF51E@lca.pw> References: <20200102120752.7b893b1e@gandalf.local.home> Cc: Sergey Senozhatsky , Andrew Morton , Linus Torvalds , tytso@mit.edu, Arnd Bergmann , gregkh@linuxfoundation.org, pmladek@suse.com, Catalin Marinas , Will Deacon , dan.j.williams@intel.com, Peter Zijlstra , longman@redhat.com, Thomas Gleixner , Linux-MM , linux-arm-kernel@lists.infradead.org, Linux Kernel Mailing List In-Reply-To: <20200102120752.7b893b1e@gandalf.local.home> To: Steven Rostedt X-Mailer: iPhone Mail (17C54) 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 Jan 2, 2020, at 12:07 PM, Steven Rostedt wrote: >=20 > How would this disable lockdep early in the process? The patch is just > changing pr_notice() to printk_deferred() correct? Yes, I meant without this patch. Lockdep will easily generate this potential= deadlock warning early after boot and then disable itself.=