From patchwork Wed Mar 30 15:53:29 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Petr Mladek X-Patchwork-Id: 8699241 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 162BEC0553 for ; Wed, 30 Mar 2016 15:56:40 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 1764B20386 for ; Wed, 30 Mar 2016 15:56:35 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 6C90120384 for ; Wed, 30 Mar 2016 15:56:29 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1alISS-0000Sb-Ti; Wed, 30 Mar 2016 15:55:00 +0000 Received: from mx2.suse.de ([195.135.220.15]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1alIRj-0008J2-Kz for linux-arm-kernel@lists.infradead.org; Wed, 30 Mar 2016 15:54:21 +0000 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (charybdis-ext.suse.de [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 103C3ADEB; Wed, 30 Mar 2016 15:53:57 +0000 (UTC) From: Petr Mladek To: Andrew Morton Subject: [PATCH v4 4/5] printk/nmi: increase the size of NMI buffer and make it configurable Date: Wed, 30 Mar 2016 17:53:29 +0200 Message-Id: <1459353210-20260-5-git-send-email-pmladek@suse.com> X-Mailer: git-send-email 1.8.5.6 In-Reply-To: <1459353210-20260-1-git-send-email-pmladek@suse.com> References: <1459353210-20260-1-git-send-email-pmladek@suse.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160330_085416_312324_1D079B43 X-CRM114-Status: GOOD ( 13.38 ) X-Spam-Score: -1.9 (-) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-mips@linux-mips.org, Jan Kara , Sergey Senozhatsky , linux-sh@vger.kernel.org, Peter Zijlstra , Benjamin Herrenschmidt , Chris Metcalf , sparclinux@vger.kernel.org, linux-s390@vger.kernel.org, Daniel Thompson , x86@kernel.org, Ingo Molnar , Russell King , Petr Mladek , adi-buildroot-devel@lists.sourceforge.net, Steven Rostedt , Thomas Gleixner , linux-arm-kernel@lists.infradead.org, Jiri Kosina , linux-cris-kernel@axis.com, linux-kernel@vger.kernel.org, Ralf Baechle , Martin Schwidefsky , linuxppc-dev@lists.ozlabs.org, David Miller MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.9 required=5.0 tests=BAYES_00,RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Testing has shown that the backtrace sometimes does not fit into the 4kB temporary buffer that is used in NMI context. The warnings are gone when I double the temporary buffer size. This patch doubles the buffer size and makes it configurable. Note that this problem existed even in the x86-specific implementation that was added by the commit a9edc8809328 ("x86/nmi: Perform a safe NMI stack trace on all CPUs"). Nobody noticed it because it did not print any warnings. Signed-off-by: Petr Mladek Cc: Jan Kara Cc: Peter Zijlstra Cc: Steven Rostedt Cc: Russell King Cc: Daniel Thompson Cc: Jiri Kosina Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Ralf Baechle Cc: Benjamin Herrenschmidt Cc: Martin Schwidefsky Cc: David Miller Signed-off-by: Andrew Morton --- init/Kconfig | 22 ++++++++++++++++++++++ kernel/printk/nmi.c | 3 ++- 2 files changed, 24 insertions(+), 1 deletion(-) diff --git a/init/Kconfig b/init/Kconfig index fd10deeefc22..1c9be9396a4a 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -861,6 +861,28 @@ config LOG_CPU_MAX_BUF_SHIFT 13 => 8 KB for each CPU 12 => 4 KB for each CPU +config NMI_LOG_BUF_SHIFT + int "Temporary per-CPU NMI log buffer size (12 => 4KB, 13 => 8KB)" + range 10 21 + default 13 + depends on PRINTK_NMI + help + Select the size of a per-CPU buffer where NMI messages are temporary + stored. They are copied to the main log buffer in a safe context + to avoid a deadlock. The value defines the size as a power of 2. + + NMI messages are rare and limited. The largest one is when + a backtrace is printed. It usually fits into 4KB. Select + 8KB if you want to be on the safe side. + + Examples: + 17 => 128 KB for each CPU + 16 => 64 KB for each CPU + 15 => 32 KB for each CPU + 14 => 16 KB for each CPU + 13 => 8 KB for each CPU + 12 => 4 KB for each CPU + # # Architectures with an unreliable sched_clock() should select this: # diff --git a/kernel/printk/nmi.c b/kernel/printk/nmi.c index 572f94922230..bf08557d7e3d 100644 --- a/kernel/printk/nmi.c +++ b/kernel/printk/nmi.c @@ -41,7 +41,8 @@ DEFINE_PER_CPU(printk_func_t, printk_func) = vprintk_default; static int printk_nmi_irq_ready; atomic_t nmi_message_lost; -#define NMI_LOG_BUF_LEN (4096 - sizeof(atomic_t) - sizeof(struct irq_work)) +#define NMI_LOG_BUF_LEN ((1 << CONFIG_NMI_LOG_BUF_SHIFT) - \ + sizeof(atomic_t) - sizeof(struct irq_work)) struct nmi_seq_buf { atomic_t len; /* length of written data */