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=-0.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 19458C433EF for ; Tue, 19 Jun 2018 08:27:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C03232083D for ; Tue, 19 Jun 2018 08:27:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="GjjTilnP" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C03232083D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S937468AbeFSI10 (ORCPT ); Tue, 19 Jun 2018 04:27:26 -0400 Received: from mail-pl0-f66.google.com ([209.85.160.66]:43031 "EHLO mail-pl0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S937267AbeFSI1W (ORCPT ); Tue, 19 Jun 2018 04:27:22 -0400 Received: by mail-pl0-f66.google.com with SMTP id c41-v6so10543223plj.10; Tue, 19 Jun 2018 01:27:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=Cl5YUUfahVyIU9R3gjgQfDHBHuT86a9lKZ1k2NtdW/Q=; b=GjjTilnPZDabGAMBiuDKdojVpkzvxapfI68vtNbrNztyscWORRCvK9iOaLr88CTszZ 9nUrSIO3ThKDMk51Rj/EE/OtdHajC+4s/dv+D0HKu4Vdxcfxb4r9QMQnzPuqQwR2MGnG HVsZKVkF3v3UR+OdYtVByityUyzGpyJNVzxbhrs/QA7Unv7frTztjHPN+k5fddi1cMV6 zKQvIWhyUX+PoP4heimiuVGxCXRfRwU+gQjXHxAzuhCtL/feFYqqcqMYSi8A8JzGTYni Q8DkFelWoxtBOdBPEZ3B8BApmumtQvGNL3k6h16ec/+whQ2b9nlSlxBWlhvVOh5HvSfw FXVg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=Cl5YUUfahVyIU9R3gjgQfDHBHuT86a9lKZ1k2NtdW/Q=; b=NqFvOWJFHuBQU/9pMtOa1SSdgIfx0HVWQIIem3tBUNNeT143l3Mpp04Kv4g7K12aFt WTGB9NcKVtWKtMCUDgPp3hYl4uGVHTtuEgmGdfbRITijKPf8SMQz7K3pHgwaWBnEx2+G hWAvAQojcVX1ZuvGU+82SnRA4bl0hP9Jy87ZySDm3Eb+zeFpvEGHth5TyufJVhzOyi6r 8k7RiQzfy+b4YaGLyuljiFgWUVhH1tn+9xKtA/hh2K6A+mo5KqBwGRz8lgfDzb7fF43r /6qhf7wGqM0McFPX5GjKGttIbEgADyZWR5vYjhECh0Z5ddbw6ZH76EBPY6FcLaIetBAq gy3g== X-Gm-Message-State: APt69E1wkNUE9AJJxFqk5mmA62BkFO/D4CWCTKOkS0w+FUUZ5Iw0U4aG scRXOxzFBz829LuPclMwvMY= X-Google-Smtp-Source: ADUXVKKiejMpK83JZB2IbnyktzealVMPcJMZnxLJRdQr2MomiHHXQssNZ8TYNMFYj1ntK5DKsW4jYg== X-Received: by 2002:a17:902:8341:: with SMTP id z1-v6mr17988413pln.40.1529396841854; Tue, 19 Jun 2018 01:27:21 -0700 (PDT) Received: from localhost ([175.223.26.106]) by smtp.gmail.com with ESMTPSA id a11-v6sm21099193pgq.32.2018.06.19.01.27.19 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 19 Jun 2018 01:27:20 -0700 (PDT) Date: Tue, 19 Jun 2018 17:27:16 +0900 From: Sergey Senozhatsky To: Petr Mladek Cc: Sergey Senozhatsky , Sergey Senozhatsky , Steven Rostedt , Peter Zijlstra , Tetsuo Handa , linux-kernel@vger.kernel.org, "4 . 13+" Subject: Re: [PATCH] printk/nmi: Prevent deadlock when serializing NMI backtraces Message-ID: <20180619082716.GD405@jagdpanzerIV> References: <20180517143903.19339-1-pmladek@suse.com> <20180605124729.3vix5nlkjpjzdljx@pathway.suse.cz> <20180606051029.GA19211@tigerII.localdomain> <20180606103356.GB19211@tigerII.localdomain> <20180608104825.e7xoxteelaxnwx66@pathway.suse.cz> <20180618063738.GC27996@jagdpanzerIV> <20180618093917.qeaatnlqh5if6t3r@pathway.suse.cz> <20180618100718.GA555@jagdpanzerIV> <20180619075219.iq7ztwu43bn4uua7@pathway.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180619075219.iq7ztwu43bn4uua7@pathway.suse.cz> 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 (06/19/18 09:52), Petr Mladek wrote: > On Mon 2018-06-18 19:07:18, Sergey Senozhatsky wrote: > > On (06/18/18 11:39), Petr Mladek wrote: > > [..] > > > > Hmm. Can't answer right now :) > > Please, let me know what name you would like ;-) :) Wow, it's hard. Maybe we can derive some bits from the ftrace_dump() function name? Dunno... Does printk_dump_nmi_enter() sound terrible? Maybe Steven has some opinions on this? -ss