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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 22471E6400D for ; Thu, 21 Nov 2024 20:21:14 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id A7E3B6B0085; Thu, 21 Nov 2024 15:21:13 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id A2E956B0088; Thu, 21 Nov 2024 15:21:13 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8A7976B0089; Thu, 21 Nov 2024 15:21:13 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 68FBF6B0085 for ; Thu, 21 Nov 2024 15:21:13 -0500 (EST) Received: from smtpin17.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id 27C2C8150C for ; Thu, 21 Nov 2024 20:21:13 +0000 (UTC) X-FDA: 82811217888.17.3759096 Received: from nyc.source.kernel.org (nyc.source.kernel.org [147.75.193.91]) by imf09.hostedemail.com (Postfix) with ESMTP id CC98B14000A for ; Thu, 21 Nov 2024 20:20:34 +0000 (UTC) Authentication-Results: imf09.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=TOqjNU7Y; spf=pass (imf09.hostedemail.com: domain of jpoimboe@kernel.org designates 147.75.193.91 as permitted sender) smtp.mailfrom=jpoimboe@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1732220224; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=7TGd7//Rd63RqU7wB+ZMdzmwJDk7cnuK2B3SDeIWgEw=; b=rhVA3A66CxXCwS/eoiAYQP+THDEHVgOLwSeuMS9XRscjLDz2JxqiVPJ/tZUPoyqq/Vihe4 lm4G+huW0AfRErFAEpol1d3gfNaQDxu/oLsCclhKuiowJP+Jt8d6/ioHlp2kRaczfD5sNg oopPdDUmuJ0/FdZc3qrfWQuAHIlvjZE= ARC-Authentication-Results: i=1; imf09.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=TOqjNU7Y; spf=pass (imf09.hostedemail.com: domain of jpoimboe@kernel.org designates 147.75.193.91 as permitted sender) smtp.mailfrom=jpoimboe@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1732220224; a=rsa-sha256; cv=none; b=uPBhpex34moPtNU+Z1GkFWJCkOa33onktLWCmoPNHFtUkmVkTmcjOZEm9IDWtAhunkEPJx paS2EFc9xCt0TzupjjgzZJjb6TlDlvyTOdadMrQnCai46PPpRXNQCTU8sPt+TWsCGUPtxI JyNKSRtLM559ooAALnmzZkBDLvZT950= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id E4F76A4136E; Thu, 21 Nov 2024 20:19:16 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id F078FC4CECC; Thu, 21 Nov 2024 20:21:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1732220469; bh=wNYkfuMHGFqeyTu02+G0cxoLxThoICjuoPLXY/5UBYU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=TOqjNU7YKRRxGlU4c8C939Ds5dQ3oWgCHi+HIi9SAWqhPZoTnaadXgUOKBADkM39p bKpk7g8t61Qm8fZ+XutRzXLc+fMlHcfWWYf4ErODUfSTaQzEDMDnBtGRGjhKTWJ5nq sBttLWdygAiNOBZEQ91PPHm0TUdHHLy1wNXLc99AyW3xbzRVYuQb1kYgS4r/PFeY/e t/Ildf4N3ekcAFa6CEAIhWFEoPBehSXKK+GqSFk0ijuCbucPr+xzJFwlUA5eLkqff6 cpmyLXfIcSVA56+JnbQEFKYu5YhmNFA0tldkKGGPV+K3l7DuzWYdVwRgJiiHCFIffG DY7/UWJzfaJag== Date: Thu, 21 Nov 2024 12:21:06 -0800 From: Josh Poimboeuf To: Valentin Schneider Cc: Peter Zijlstra , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org, bpf@vger.kernel.org, x86@kernel.org, rcu@vger.kernel.org, linux-kselftest@vger.kernel.org, Steven Rostedt , Masami Hiramatsu , Jonathan Corbet , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Paolo Bonzini , Wanpeng Li , Vitaly Kuznetsov , Andy Lutomirski , Frederic Weisbecker , "Paul E. McKenney" , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Mathieu Desnoyers , Lai Jiangshan , Zqiang , Andrew Morton , Uladzislau Rezki , Christoph Hellwig , Lorenzo Stoakes , Jason Baron , Kees Cook , Sami Tolvanen , Ard Biesheuvel , Nicholas Piggin , Juerg Haefliger , Nicolas Saenz Julienne , "Kirill A. Shutemov" , Nadav Amit , Dan Carpenter , Chuang Wang , Yang Jihong , Petr Mladek , "Jason A. Donenfeld" , Song Liu , Julian Pidancet , Tom Lendacky , Dionna Glaze , Thomas =?utf-8?Q?Wei=C3=9Fschuh?= , Juri Lelli , Marcelo Tosatti , Yair Podemsky , Daniel Wagner , Petr Tesarik Subject: Re: [RFC PATCH v3 06/15] jump_label: Add forceful jump label type Message-ID: <20241121202106.nqybif4yru57wgu3@jpoimboe> References: <20241119153502.41361-1-vschneid@redhat.com> <20241119153502.41361-7-vschneid@redhat.com> <20241119233902.kierxzg2aywpevqx@jpoimboe> <20241120145649.GJ19989@noisy.programming.kicks-ass.net> <20241120145746.GL38972@noisy.programming.kicks-ass.net> <20241120165515.qx4qyenlb5guvmfe@jpoimboe> <20241121110020.GC24774@noisy.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: CC98B14000A X-Stat-Signature: tyywba35h1y1dm1wpiryim3b168iuecw X-Rspam-User: X-HE-Tag: 1732220434-271687 X-HE-Meta: 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 gtggnYqB 7bvJKeAIkhXGiaxDBLNpDdlLM5S/M1jd432Fwx06O+j1RA3GRn4swhy60WR4Vyax9CtYtypYPFrk33xBXfqlkFKPThOULb+Xa6OoGv/LAoGiSGDHEt/lTQotHAzJdPo2trRIpzCmMuc/AZu0YnYbJ6tr1Vw/xxIxguadHJ1za9dXUjuxI+JEVzlrcRC79P+W1j3pmNpwx+DvRRLxoamk3N+wg78Fq7RcB4y4X0N+BDEICCwIOiS/KCqTGPoC5JTD8HRzQPUshgdSwXT5TSdHJKXVZ8h7brxUOEjahpbN9D3RUqnABU1PI3wBT5UY0RTqbeJhhC2fdaCyKkFs1fNv+mz6SD1lzWa8m/98Z2f2QHIo5BzxorPa0HLTUDo+goiRHfrJSzeNsq4TbZ6SmoJCeSeYy1Af89DNKf6// 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: List-Subscribe: List-Unsubscribe: On Thu, Nov 21, 2024 at 04:51:09PM +0100, Valentin Schneider wrote: > Okay so forcing the IPI for .noinstr patching lets us get rid of all the > force_ipi faff; however I would still want the special marking to tell > objtool "yep we're okay with this one", and still get warnings when a new > .noinstr key gets added so we double think about it. Yeah. Though, instead of DECLARE_STATIC_KEY_FALSE_NOINSTR adding a new jump label type, it could just add an objtool annotation pointing to the key. If that's the way we're going I could whip up a patch if that would help. -- Josh