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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 51F94C43381 for ; Wed, 27 Feb 2019 16:13:07 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id CE6DC20C01 for ; Wed, 27 Feb 2019 16:13:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CE6DC20C01 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 448ghK1gvkzDqJC for ; Thu, 28 Feb 2019 03:13:05 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=none (mailfrom) smtp.mailfrom=linux.intel.com (client-ip=134.134.136.126; helo=mga18.intel.com; envelope-from=ricardo.neri-calderon@linux.intel.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.intel.com Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 448gXC4Q1ZzDqFt for ; Thu, 28 Feb 2019 03:06:03 +1100 (AEDT) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga106.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 27 Feb 2019 08:05:53 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.58,420,1544515200"; d="scan'208";a="303011711" Received: from unknown (HELO luv-build.sc.intel.com) ([172.25.110.25]) by orsmga005.jf.intel.com with ESMTP; 27 Feb 2019 08:05:51 -0800 From: Ricardo Neri To: Thomas Gleixner , Ingo Molnar , Borislav Petkov Subject: [RFC PATCH v2 10/14] kernel/watchdog: Add a function to obtain the watchdog_allowed_mask Date: Wed, 27 Feb 2019 08:05:14 -0800 Message-Id: <1551283518-18922-11-git-send-email-ricardo.neri-calderon@linux.intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1551283518-18922-1-git-send-email-ricardo.neri-calderon@linux.intel.com> References: <1551283518-18922-1-git-send-email-ricardo.neri-calderon@linux.intel.com> X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Rafael J. Wysocki" , Peter Zijlstra , Alexei Starovoitov , Kai-Heng Feng , Paul Mackerras , "H. Peter Anvin" , sparclinux@vger.kernel.org, Christoffer Dall , Davidlohr Bueso , Ashok Raj , x86@kernel.org, David Rientjes , Andi Kleen , Waiman Long , "Paul E. McKenney" , Don Zickus , "Ravi V. Shankar" , Konrad Rzeszutek Wilk , Marc Zyngier , Ricardo Neri , Frederic Weisbecker , Nicholas Piggin , Ricardo Neri , Byungchul Park , Mathieu Desnoyers , Josh Poimboeuf , Tony Luck , Babu Moger , Randy Dunlap , linux-kernel@vger.kernel.org, "Luis R. Rodriguez" , Masami Hiramatsu , Philippe Ombredanne , Colin Ian King , Andrew Morton , linuxppc-dev@lists.ozlabs.org, "David S. Miller" Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Implementations of NMI watchdogs that use a single piece of hardware to monitor all the CPUs in the system (as opposed to per-CPU implementations such as perf) need to know which CPUs the watchdog is allowed to monitor. In this manner, non-maskable interrupts are directed only to the monitored CPUs. Cc: "H. Peter Anvin" Cc: Ashok Raj Cc: Andi Kleen Cc: Tony Luck Cc: "Rafael J. Wysocki" Cc: Don Zickus Cc: Nicholas Piggin Cc: Michael Ellerman Cc: Frederic Weisbecker Cc: Alexei Starovoitov Cc: Babu Moger Cc: Paul Mackerras Cc: Mathieu Desnoyers Cc: Masami Hiramatsu Cc: Peter Zijlstra Cc: Andrew Morton Cc: Philippe Ombredanne Cc: Colin Ian King Cc: Byungchul Park Cc: "Paul E. McKenney" Cc: "Luis R. Rodriguez" Cc: Waiman Long Cc: Josh Poimboeuf Cc: Randy Dunlap Cc: Davidlohr Bueso Cc: Christoffer Dall Cc: Marc Zyngier Cc: Kai-Heng Feng Cc: Konrad Rzeszutek Wilk Cc: David Rientjes Cc: "Ravi V. Shankar" Cc: x86@kernel.org Cc: "David S. Miller" Cc: Benjamin Herrenschmidt Cc: sparclinux@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Signed-off-by: Ricardo Neri --- include/linux/nmi.h | 1 + kernel/watchdog.c | 7 ++++++- 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/include/linux/nmi.h b/include/linux/nmi.h index bf5ebcfdd590..b563fb6ef21d 100644 --- a/include/linux/nmi.h +++ b/include/linux/nmi.h @@ -83,6 +83,7 @@ static inline void reset_hung_task_detector(void) { } #if defined(CONFIG_HARDLOCKUP_DETECTOR) extern void hardlockup_detector_disable(void); +extern struct cpumask *watchdog_get_allowed_cpumask(void); extern unsigned int hardlockup_panic; #else static inline void hardlockup_detector_disable(void) {} diff --git a/kernel/watchdog.c b/kernel/watchdog.c index 8fbfda94a67b..367aa81294ef 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -44,7 +44,7 @@ int __read_mostly soft_watchdog_user_enabled = 1; int __read_mostly watchdog_thresh = 10; int __read_mostly nmi_watchdog_available; -struct cpumask watchdog_allowed_mask __read_mostly; +static struct cpumask watchdog_allowed_mask __read_mostly; struct cpumask watchdog_cpumask __read_mostly; unsigned long *watchdog_cpumask_bits = cpumask_bits(&watchdog_cpumask); @@ -92,6 +92,11 @@ static int __init hardlockup_all_cpu_backtrace_setup(char *str) } __setup("hardlockup_all_cpu_backtrace=", hardlockup_all_cpu_backtrace_setup); # endif /* CONFIG_SMP */ + +struct cpumask *watchdog_get_allowed_cpumask(void) +{ + return &watchdog_allowed_mask; +} #endif /* CONFIG_HARDLOCKUP_DETECTOR */ /* -- 2.17.1