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=-4.0 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 2BD73C433DB for ; Sat, 6 Mar 2021 12:55:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DFCC16501A for ; Sat, 6 Mar 2021 12:55:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230431AbhCFMzI (ORCPT ); Sat, 6 Mar 2021 07:55:08 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39954 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230227AbhCFMym (ORCPT ); Sat, 6 Mar 2021 07:54:42 -0500 Received: from mail-ej1-x631.google.com (mail-ej1-x631.google.com [IPv6:2a00:1450:4864:20::631]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B3D89C06174A for ; Sat, 6 Mar 2021 04:54:41 -0800 (PST) Received: by mail-ej1-x631.google.com with SMTP id r17so9347677ejy.13 for ; Sat, 06 Mar 2021 04:54:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=9hAH6iGMFoWEnEvBb1A3YoeISkLHQTxSseyp5CoaNWU=; b=Aa1tQyPojaD7gjcJOlbvlXqnvOOmIAVaALkBNi10VgNxNNuyF6Nsb3k45m6AQDV+sG RLMU8m3yJEpfvIKeGaX9/X1GZU8rBuLAb/Vns60XTjArrzsL1Xxm3KhvID9aNXeczloi FG0aEl/Pp4EJTFoSwNkcEjGuVMcMIdizYdhzO1x3p7lyhh5JAVHbk3piqOWwy090yB3w ilajvNcAPaJLkcPQan4YB1fG7C9owvC17yVhirrGa+MtjK4qvaAotNezmirzqYUp2+n4 OmcFy2zAijzi26Nr9dyvqPSl8baklkWvCwg1eSIGM2xljtPg3CKVjyertahh8udz+rlW hYnw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :references:mime-version:content-disposition:in-reply-to; bh=9hAH6iGMFoWEnEvBb1A3YoeISkLHQTxSseyp5CoaNWU=; b=R5lEnJMCDkPdU7ehRr5kpL/Dbkg7IGDNpbY4w2AaBMAsM2yJn+oSvOKbbOqLGTdT3A yvydreRunKFW4lNwKvRS8n3b2HfK1iqdXrbyCvBWQ3cPg2n2dTWaYBBSot52mFja03Y/ y9brMmvL8u6046RUopJ1qpkfa0SHTfO9V5uw1dTYOPF/tSZFRcFnrEbU9fdOYcuy+tyj hkK5UXLyAUCKbtZaFuW+vpiSgDsb17qMde8CnHXcro1L/HkCIY80AeyuapCQu0rHBKx9 g5lhKLR6UU7EUfZOWkPQWfIHkwSumWi/D7w/2EP9H0mlq4dLsMX8C3gv+uPeeUkaj0JK BcHg== X-Gm-Message-State: AOAM5313iaMS4cmkJ7CJVrX0plW5rF5AK24d5Lv8G/5P0xiAMu0kTWvE WjR6bSGmLo1kzb3NsAPehzU= X-Google-Smtp-Source: ABdhPJz9JA0/7kxIj2/phM7OMcGNcV4ufBlAiEaE5CO7EiomB1CMAIKLEMXEfYIAJNw08CezmFlG0Q== X-Received: by 2002:a17:906:1d55:: with SMTP id o21mr6774545ejh.485.1615035280481; Sat, 06 Mar 2021 04:54:40 -0800 (PST) Received: from gmail.com (54033286.catv.pool.telekom.hu. [84.3.50.134]) by smtp.gmail.com with ESMTPSA id cw14sm3624796edb.8.2021.03.06.04.54.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 06 Mar 2021 04:54:39 -0800 (PST) Sender: Ingo Molnar Date: Sat, 6 Mar 2021 13:54:37 +0100 From: Ingo Molnar To: Linus Torvalds , Stephen Rothwell , Andrew Morton Cc: Pavel Machek , Krzysztof Kozlowski , Linux Kernel Mailing List , Borislav Petkov , Thomas Gleixner , Peter Zijlstra Subject: Re: A note on the 5.12-rc1 tag Message-ID: <20210306125437.GA436274@gmail.com> References: <20210304124314.GA9979@duo.ucw.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Linus Torvalds wrote: > But I also can heartily just recommend that people who already _did_ > start on rc1 to rebase their current - hopefully not extensive - work. Thanks for the heads-up - we just rebased about 50 commits in -tip to avoid this bug: our normal workflow is to jump on -rc1 once it's released and integrate pending development work that we normally don't apply during the merge window. So our special pattern of pent-up merging did bite us a little bit - but nothing particularly serious. > I know I've ranted about rebasing for years, and it has huge > downsides, but the operation does exist because sometimes you just > need to fix serious errors. So _mindful_ rebasing, understanding why > it shouldn't be a normal thing, but doing it when something > exceptional happens - that's not wrong. Yeah, and in this case not sending scarce-resource testers & bisecters into the middle of a file corruption bug is definitely the right thing to do. Maybe -next could double check that none of the maintainer trees have an -rc1 base? Your note here was kind of low-key. :-) And maybe there's some bisection helper annotation or hook-script that can be embedded in the kernel Git tree to avoid or at least warn about particularly nasty bugs? Thanks, Ingo