linux-kernel - [PATCH] perf/x86/intel: Use guard() instead of mutex

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Message-Id: <20250901131714.646988-1-liaoyuanhong@vivo.com>
Date: Mon,  1 Sep 2025 21:17:13 +0800
From: Liao Yuanhong <liaoyuanhong@...o.com>
To: Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
	"H. Peter Anvin" <hpa@...or.com>,
	linux-perf-users@...r.kernel.org (open list:PERFORMANCE EVENTS SUBSYSTEM),
	linux-kernel@...r.kernel.org (open list:PERFORMANCE EVENTS SUBSYSTEM)
Cc: Liao Yuanhong <liaoyuanhong@...o.com>
Subject: [PATCH] perf/x86/intel: Use guard() instead of mutex_lock() to simplify code

Using guard(mutex) instead of mutex_lock/mutex_unlock pair. Simplifies the
error handling to just return in case of error. No need for the 'done'
label anymore so remove it.

Signed-off-by: Liao Yuanhong <liaoyuanhong@...o.com>
---
 arch/x86/events/intel/core.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 28f5468a6ea3..ac88d9535e85 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -6107,18 +6107,16 @@ static ssize_t freeze_on_smi_store(struct device *cdev,
 	if (val > 1)
 		return -EINVAL;
 
-	mutex_lock(&freeze_on_smi_mutex);
+	guard(mutex)(&freeze_on_smi_mutex);
 
 	if (x86_pmu.attr_freeze_on_smi == val)
-		goto done;
+		return count;
 
 	x86_pmu.attr_freeze_on_smi = val;
 
 	cpus_read_lock();
 	on_each_cpu(flip_smm_bit, &val, 1);
 	cpus_read_unlock();
-done:
-	mutex_unlock(&freeze_on_smi_mutex);
 
 	return count;
 }
-- 
2.34.1