Received: by 2002:ac0:a5a7:0:0:0:0:0 with SMTP id m36-v6csp299496imm; Mon, 9 Jul 2018 01:51:33 -0700 (PDT) X-Google-Smtp-Source: AAOMgpcHSI++MHOFeQk3lVXZjY+Hizt9ab4nZYMRPfxgvequnbvLk5dfReJZpg66EXKutXwsnaQ8 X-Received: by 2002:a62:ba13:: with SMTP id k19-v6mr20407927pff.245.1531126293381; Mon, 09 Jul 2018 01:51:33 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1531126293; cv=none; d=google.com; s=arc-20160816; b=bok8/Ia0PaBJSmGKCuZg96m6B2k68/JTA/EnPK7o7tHjw0QPFTT1P2niSMeaHlEZ+O rrXADFQevPGWBggTqcWWXF95KeKV6S8cg8Pk/dfxSmWEA+uZhlIl+qWw7mdcfTfafpuG 91T0IGIofk3svQbHS4xdYXWyJ/AGpyip2UMbYUdras0p1n09UO0VnxgpVG7BYarN1CPh Xf2TY0tdbzFZMVLSS4X4g6FE60EFR8jUEscVn3yRzOfZuLRwnWZp3e0dEsPGq2qR9VJE tgMbztyC+pAjnc3bo2SdhfdLMvR9Xz+f4fnvr/13LpZhcMAZxfYTGQS3mBkAk5yjYDLL BR3Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-disposition:mime-version:references:message-id:subject:cc :to:from:date:dkim-signature:arc-authentication-results; bh=W5stwuU4mtY1E404aWVJRmPcl5usRhmh2n4cmpjcHag=; b=djLeBmp3TSML9ClAGkVG02ACE0qQQzIEyL62uEGLbWKiNvusR90pXREXLOAdQ7E4Qq q7uSrmqTdp9s8/HU7AY+G3phpeyVeGvuEFlWWo8IguQqNm4GFBja2ezfoJAmoxtCW4T9 anOBJ0HCLbMdAtxTjljAFzGFmqWiY/MY2YdaK/POGaOOqgBx3uGA5Nu2+9GpHyBuwazt AYAsg+iyRGZfl29cu0lfKHGNMHtNWxh8M2iJRl860sq/b3Oj4dEPck3iAx7CeR7tdl9J Np5jtK4H4/64+vYaSmrMalXGDU93WTlGbgMq3u024XojnZyf+mWnbw/6AqCrgRp0+Tzc llsg== ARC-Authentication-Results: i=1; mx.google.com; dkim=fail header.i=@infradead.org header.s=bombadil.20170209 header.b=nTNZ8yK5; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id y34-v6si14235923plb.317.2018.07.09.01.51.18; Mon, 09 Jul 2018 01:51:33 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=fail header.i=@infradead.org header.s=bombadil.20170209 header.b=nTNZ8yK5; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754407AbeGIIuI (ORCPT + 99 others); Mon, 9 Jul 2018 04:50:08 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:49746 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754142AbeGIIuG (ORCPT ); Mon, 9 Jul 2018 04:50:06 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=W5stwuU4mtY1E404aWVJRmPcl5usRhmh2n4cmpjcHag=; b=nTNZ8yK5Gl5XN5oiLqKlzJQnK n0gAxTXddM3hhdp63fGSIRmrpTZG8DvBKN5MQAVnMJpdiPTnp+jH5pDACLFjFEm9tucCHtxvzobrM 7BYBo0qzVUnx0suiUEwOoI1UxfKVps6vjFK0hYzjLOS4fUyJ6NLdlWs0wNSRcIyXisW/nYU48p/0x 5nqqb8rn6XocFqUHKM7NpbqKHjXd0kONRYxrIld8827YCM/dzVv9H2vcoh8MA3OMJkoNhy5ZITEJO vuNZ6Ay6Oep/vE9xz/TZ+/JBvYkovE0Qm3tdlgqGkQwbJOhJCMZbLkjB/JI2HM7LjdRN4aAnS1laG izDRizC1A==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=hirez.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1fcRrn-0005oq-Kv; Mon, 09 Jul 2018 08:49:55 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id EDA6B2028932D; Mon, 9 Jul 2018 10:49:53 +0200 (CEST) Date: Mon, 9 Jul 2018 10:49:53 +0200 From: Peter Zijlstra To: Tetsuo Handa Cc: Ingo Molnar , mingo@redhat.com, linux-kernel@vger.kernel.org, Tetsuo Handa , Andy Lutomirski , Borislav Petkov , Josh Poimboeuf , Linus Torvalds , Thomas Gleixner Subject: Re: [PATCH] x86: Avoid pr_cont() in show_opcodes() Message-ID: <20180709084953.GB2476@hirez.programming.kicks-ass.net> References: <1530943625-3288-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp> <20180707111209.GA27768@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.0 (2018-05-17) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Jul 07, 2018 at 10:54:28PM +0900, Tetsuo Handa wrote: > >> Since syzbot is confused by concurrent printk() messages [1], > >> this patch changes show_opcodes() to use snprintf(). But how big of a problem is that really? We can't very well remove all pr_cont stuff from the kernel.