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=-0.9 required=3.0 tests=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 BA3B3C3276D for ; Thu, 2 Jan 2020 17:16:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 82CBF21582 for ; Thu, 2 Jan 2020 17:16:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lca.pw header.i=@lca.pw header.b="Q15Fp3sZ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727743AbgABRQb (ORCPT ); Thu, 2 Jan 2020 12:16:31 -0500 Received: from mail-qt1-f195.google.com ([209.85.160.195]:41465 "EHLO mail-qt1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726125AbgABRQb (ORCPT ); Thu, 2 Jan 2020 12:16:31 -0500 Received: by mail-qt1-f195.google.com with SMTP id k40so35106339qtk.8 for ; Thu, 02 Jan 2020 09:16:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lca.pw; s=google; h=content-transfer-encoding:from:mime-version:subject:date:message-id :references:cc:in-reply-to:to; bh=kAQJ38i09v+amShK5qBU7ZxzERB9iZK7X0VJJQXO1pg=; b=Q15Fp3sZh1kg8N0IVHw9ikL56635h8bswHZ2x6XjfR/BSZnwsOzAgLtXnm2d7Dg7dZ bMeW/7mkX53lSUV/K1ss+mCX+VOaMu2ECxzXppX5Ms+99ZYEYLAJWSxNuIB0Ri8K6hfX sKyySuuY4n/KjuL8AbnYomGeKvf6T0kG/Sri042sL7f456qFWyvmDo0aPZbzyr0wkUTm Pfj4pDVpM1lpQUmzIucs1dVdc2LCtncu4V6/1h6GPFDid/oJmDab4VyY1vJ98FrRRzOJ 2T5gnqKsHfg18X5kRdxWRIZmxjn1u5voiXAAT8UURcECLMFjsneP9spdTBvaYjFPnQwA vjjg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:content-transfer-encoding:from:mime-version :subject:date:message-id:references:cc:in-reply-to:to; bh=kAQJ38i09v+amShK5qBU7ZxzERB9iZK7X0VJJQXO1pg=; b=fJ3JqMl0tAOYJDH70k9bkj3yi0GPGicC3lcQrlvjIRJ/ijrrtWCRfYR9lW83yC8Rc7 T+UlZVXdIn3gaVrMUxoj+osdDPEMirRs0tCk73fZEBBC+5AWaIJtlTqjLgqJ5uiNwxZh GBHYDTTSTvGnbu0mUF5ODJszcefSwugZbsl3Li/5jX9a7HaToWmsoi4QLmvbc6LRl8VQ Mn02OwGrhNoT9yF6vACJCmReUgdrbLUtKkME/Rv5zRUYyp0ocV8gZzY30/rN/SkQjw9G KoNW7oma6M8qx7IDwFYlcLdt/RXjYAnd3PiFQEbvdPdWSbiwPYwLtyXbGUcLjUHh+bYN UNlg== X-Gm-Message-State: APjAAAUQppGY9FJNr+ina/tGB+3H79iw/BuQF7N4EVDjvBOgM8WF4o4R KV/o6INW1DCUq/3GuIhF4AiKZ1s8IBU= X-Google-Smtp-Source: APXvYqx2n+XHSH8XLpr4h7ciLtNAaJg762Gum669jBlOte1uvG5D9FGqgFfW3TyrJUpxF28qlAc4dg== X-Received: by 2002:aed:3e83:: with SMTP id n3mr59731182qtf.322.1577985390236; Thu, 02 Jan 2020 09:16:30 -0800 (PST) Received: from [192.168.1.183] (pool-71-184-117-43.bstnma.fios.verizon.net. [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) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > 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.=