From nobody Tue Feb 10 07:22:23 2026 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1B7C7C7EE2A for ; Fri, 19 May 2023 17:21:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231951AbjESRVp (ORCPT ); Fri, 19 May 2023 13:21:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59380 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231400AbjESRVZ (ORCPT ); Fri, 19 May 2023 13:21:25 -0400 Received: from mail-pj1-x1034.google.com (mail-pj1-x1034.google.com [IPv6:2607:f8b0:4864:20::1034]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2A14D10E3 for ; Fri, 19 May 2023 10:21:05 -0700 (PDT) Received: by mail-pj1-x1034.google.com with SMTP id 98e67ed59e1d1-2535d86a41bso1627793a91.3 for ; Fri, 19 May 2023 10:21:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1684516864; x=1687108864; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=BBw4uifuzwjtC1EJSKRNgzKWGRkSP/trxFy/VEab+1U=; b=C0Isk5LoVOO5xBj08Ka29F5mSazn4+608Fj8hSVomCBNII30To6zGAh3uqBhclp5Po RoR0m/F8OkPL1Fg6XrRCGAvftgsjt8zKTnlHd3XnlQKPdWI9/upIWnc354omRRekG/Vd 4TzsQ4hKHmtS5GROcyT9kz7nfPJTE6eYw3FL8= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1684516864; x=1687108864; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=BBw4uifuzwjtC1EJSKRNgzKWGRkSP/trxFy/VEab+1U=; b=MVDQlpkxe53xkhAhG5vfsGHe+iqWWAV7dyCKGExTvwW5XfufD3EhZV2FjWK5ecjxcA qua0tS3EtaLU9zDhfYl5QHP4mn5JGEts8DzS1C+hZ0O6hwPxPEWu3U7N2FM5hLfo5V6o 8ubXk488G5Pbc3/4ssgxjTt1uWOtGIKZzCM0ypWYaehiL86ed/9+5gUrZO7mn2W2ikvP D7bqflfJJ1DbrG/SSNtnVVf0jW8shzZd/z/CO3n6iv+6a12VaaHbxCLoxN9ZBVVzsyBh D5EvpKkSdZnF0ukOOHdAbu5FFZeHM7RmUUVAy47o8FpenzXBxeq8vu1ryWrVaETVUAqS j45Q== X-Gm-Message-State: AC+VfDw5Hi8Gnma0gwD+lbek8KXO9NR7qWARVTsk+NAg0DAH/gl3CMgb k+UhH2TmwXLMA2MNY2SMv7c1Ag== X-Google-Smtp-Source: ACHHUZ4TDRDg+n16F9FgO6fjA4fEHipyKz1sAvTzlrch+J4I3oFlt6TdHTXq6tF/PHzC+ANYmNfBhw== X-Received: by 2002:a17:90a:f3c7:b0:249:748b:a232 with SMTP id ha7-20020a17090af3c700b00249748ba232mr2835727pjb.25.1684516864714; Fri, 19 May 2023 10:21:04 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:9d:2:9b89:2dd0:d160:429d]) by smtp.gmail.com with ESMTPSA id gj19-20020a17090b109300b0024e4f169931sm1763835pjb.2.2023.05.19.10.21.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 19 May 2023 10:21:04 -0700 (PDT) From: Douglas Anderson To: Petr Mladek , Andrew Morton Cc: Matthias Kaehlcke , kgdb-bugreport@lists.sourceforge.net, Stephane Eranian , mpe@ellerman.id.au, Tzung-Bi Shih , Daniel Thompson , Mark Rutland , linuxppc-dev@lists.ozlabs.org, Sumit Garg , npiggin@gmail.com, davem@davemloft.net, Marc Zyngier , Stephen Boyd , sparclinux@vger.kernel.org, christophe.leroy@csgroup.eu, Catalin Marinas , ravi.v.shankar@intel.com, Randy Dunlap , Pingfan Liu , Guenter Roeck , Lecopzer Chen , Ian Rogers , ito-yuichi@fujitsu.com, ricardo.neri@intel.com, linux-arm-kernel@lists.infradead.org, linux-perf-users@vger.kernel.org, Will Deacon , Chen-Yu Tsai , linux-kernel@vger.kernel.org, Masayoshi Mizuma , Andi Kleen , Douglas Anderson Subject: [PATCH v5 09/18] watchdog/hardlockup: Style changes to watchdog_hardlockup_check() / is_hardlockup() Date: Fri, 19 May 2023 10:18:33 -0700 Message-ID: <20230519101840.v5.9.I818492c326b632560b09f20d2608455ecf9d3650@changeid> X-Mailer: git-send-email 2.40.1.698.g37aff9b760-goog In-Reply-To: <20230519101840.v5.18.Ia44852044cdcb074f387e80df6b45e892965d4a1@changeid> References: <20230519101840.v5.18.Ia44852044cdcb074f387e80df6b45e892965d4a1@changeid> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" These are tiny style changes: - Add a blank line before a "return". - Renames two globals to use the "watchdog_hardlockup" prefix. - Store processor id in "unsigned int" rather than "int". - Minor comment rewording. - Use "else" rather than extra returns since it seemed more symmetric. Reviewed-by: Petr Mladek Signed-off-by: Douglas Anderson --- Changes in v5: - watchdog_hardlockup_dumped_stacks =3D> watchdog_hardlockup_all_cpu_dumped - watchdog_hardlockup_processed =3D> watchdog_hardlockup_warned Changes in v4: - ("Style changes to watchdog_hardlockup_check ...") new for v4. kernel/watchdog.c | 32 +++++++++++++++----------------- 1 file changed, 15 insertions(+), 17 deletions(-) diff --git a/kernel/watchdog.c b/kernel/watchdog.c index 12ce37d76e7d..169e5dffbc00 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -89,8 +89,8 @@ __setup("nmi_watchdog=3D", hardlockup_panic_setup); =20 static DEFINE_PER_CPU(unsigned long, hrtimer_interrupts); static DEFINE_PER_CPU(unsigned long, hrtimer_interrupts_saved); -static DEFINE_PER_CPU(bool, hard_watchdog_warn); -static unsigned long hardlockup_allcpu_dumped; +static DEFINE_PER_CPU(bool, watchdog_hardlockup_warned); +static unsigned long watchdog_hardlockup_all_cpu_dumped; =20 static bool is_hardlockup(void) { @@ -100,6 +100,7 @@ static bool is_hardlockup(void) return true; =20 __this_cpu_write(hrtimer_interrupts_saved, hrint); + return false; } =20 @@ -110,21 +111,20 @@ static void watchdog_hardlockup_kick(void) =20 void watchdog_hardlockup_check(struct pt_regs *regs) { - /* check for a hardlockup - * This is done by making sure our timer interrupt - * is incrementing. The timer interrupt should have - * fired multiple times before we overflow'd. If it hasn't + /* + * Check for a hardlockup by making sure the CPU's timer + * interrupt is incrementing. The timer interrupt should have + * fired multiple times before we overflow'd. If it hasn't * then this is a good indication the cpu is stuck */ if (is_hardlockup()) { - int this_cpu =3D smp_processor_id(); + unsigned int this_cpu =3D smp_processor_id(); =20 - /* only print hardlockups once */ - if (__this_cpu_read(hard_watchdog_warn) =3D=3D true) + /* Only print hardlockups once. */ + if (__this_cpu_read(watchdog_hardlockup_warned)) return; =20 - pr_emerg("Watchdog detected hard LOCKUP on cpu %d\n", - this_cpu); + pr_emerg("Watchdog detected hard LOCKUP on cpu %d\n", this_cpu); print_modules(); print_irqtrace_events(current); if (regs) @@ -137,18 +137,16 @@ void watchdog_hardlockup_check(struct pt_regs *regs) * generating interleaving traces */ if (sysctl_hardlockup_all_cpu_backtrace && - !test_and_set_bit(0, &hardlockup_allcpu_dumped)) + !test_and_set_bit(0, &watchdog_hardlockup_all_cpu_dumped)) trigger_allbutself_cpu_backtrace(); =20 if (hardlockup_panic) nmi_panic(regs, "Hard LOCKUP"); =20 - __this_cpu_write(hard_watchdog_warn, true); - return; + __this_cpu_write(watchdog_hardlockup_warned, true); + } else { + __this_cpu_write(watchdog_hardlockup_warned, false); } - - __this_cpu_write(hard_watchdog_warn, false); - return; } =20 #else /* CONFIG_HARDLOCKUP_DETECTOR_PERF */ --=20 2.40.1.698.g37aff9b760-goog