linux-kernel - [PATCH v5 09/18] watchdog/hardlockup: Style changes to watchdog_hardlockup_check() / is

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Date:   Fri, 19 May 2023 10:18:33 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     Petr Mladek <pmladek@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Matthias Kaehlcke <mka@...omium.org>,
        kgdb-bugreport@...ts.sourceforge.net,
        Stephane Eranian <eranian@...gle.com>, mpe@...erman.id.au,
        Tzung-Bi Shih <tzungbi@...omium.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        linuxppc-dev@...ts.ozlabs.org, Sumit Garg <sumit.garg@...aro.org>,
        npiggin@...il.com, davem@...emloft.net,
        Marc Zyngier <maz@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>, sparclinux@...r.kernel.org,
        christophe.leroy@...roup.eu,
        Catalin Marinas <catalin.marinas@....com>,
        ravi.v.shankar@...el.com, Randy Dunlap <rdunlap@...radead.org>,
        Pingfan Liu <kernelfans@...il.com>,
        Guenter Roeck <groeck@...omium.org>,
        Lecopzer Chen <lecopzer.chen@...iatek.com>,
        Ian Rogers <irogers@...gle.com>, ito-yuichi@...itsu.com,
        ricardo.neri@...el.com, linux-arm-kernel@...ts.infradead.org,
        linux-perf-users@...r.kernel.org, Will Deacon <will@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>, linux-kernel@...r.kernel.org,
        Masayoshi Mizuma <msys.mizuma@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Douglas Anderson <dianders@...omium.org>
Subject: [PATCH v5 09/18] watchdog/hardlockup: Style changes to watchdog_hardlockup_check() / is_hardlockup()

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 <pmladek@...e.com>
Signed-off-by: Douglas Anderson <dianders@...omium.org>
---

Changes in v5:
- watchdog_hardlockup_dumped_stacks => watchdog_hardlockup_all_cpu_dumped
- watchdog_hardlockup_processed => 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=", hardlockup_panic_setup);
 
 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;
 
 static bool is_hardlockup(void)
 {
@@ -100,6 +100,7 @@ static bool is_hardlockup(void)
 		return true;
 
 	__this_cpu_write(hrtimer_interrupts_saved, hrint);
+
 	return false;
 }
 
@@ -110,21 +111,20 @@ static void watchdog_hardlockup_kick(void)
 
 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 = smp_processor_id();
+		unsigned int this_cpu = smp_processor_id();
 
-		/* only print hardlockups once */
-		if (__this_cpu_read(hard_watchdog_warn) == true)
+		/* Only print hardlockups once. */
+		if (__this_cpu_read(watchdog_hardlockup_warned))
 			return;
 
-		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();
 
 		if (hardlockup_panic)
 			nmi_panic(regs, "Hard LOCKUP");
 
-		__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;
 }
 
 #else /* CONFIG_HARDLOCKUP_DETECTOR_PERF */
-- 
2.40.1.698.g37aff9b760-goog