linux-kernel - [PATCH 04/42] arch/x86/events/core: Convert snprintf to sysfs

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Date: Tue, 16 Jan 2024 12:51:13 +0800
From: Li Zhijian <lizhijian@...itsu.com>
To: linux-kernel@...r.kernel.org
Cc: Li Zhijian <lizhijian@...itsu.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	linux-perf-users@...r.kernel.org
Subject: [PATCH 04/42] arch/x86/events/core: Convert snprintf to sysfs_emit

Per filesystems/sysfs.rst, show() should only use sysfs_emit()
or sysfs_emit_at() when formatting the value to be returned to user space.

coccinelle complains that there are still a couple of functions that use
snprintf(). Convert them to sysfs_emit().

> ./arch/x86/events/core.c:1895:11-19: WARNING: please use sysfs_emit
> ./arch/x86/events/core.c:2542:8-16: WARNING: please use sysfs_emit
> ./arch/x86/events/core.c:2600:8-16: WARNING: please use sysfs_emit

No functional change intended

CC: Peter Zijlstra <peterz@...radead.org>
CC: Ingo Molnar <mingo@...hat.com>
CC: Arnaldo Carvalho de Melo <acme@...nel.org>
CC: Mark Rutland <mark.rutland@....com>
CC: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
CC: Jiri Olsa <jolsa@...nel.org>
CC: Namhyung Kim <namhyung@...nel.org>
CC: Ian Rogers <irogers@...gle.com>
CC: Adrian Hunter <adrian.hunter@...el.com>
CC: Thomas Gleixner <tglx@...utronix.de>
CC: Borislav Petkov <bp@...en8.de>
CC: Dave Hansen <dave.hansen@...ux.intel.com>
CC: x86@...nel.org
CC: "H. Peter Anvin" <hpa@...or.com>
CC: linux-perf-users@...r.kernel.org
Signed-off-by: Li Zhijian <lizhijian@...itsu.com>
---
 arch/x86/events/core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index 40ad1425ffa2..52e5707be03b 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -1892,7 +1892,7 @@ ssize_t events_hybrid_sysfs_show(struct device *dev,
 		if (x86_pmu.hybrid_pmu[i].pmu_type & pmu->pmu_type) {
 			next_str = strchr(str, ';');
 			if (next_str)
-				return snprintf(page, next_str - str + 1, "%s", str);
+				return sysfs_emit(page, "%s", str);
 			else
 				return sprintf(page, "%s", str);
 		}
@@ -2539,7 +2539,7 @@ static ssize_t get_attr_rdpmc(struct device *cdev,
 			      struct device_attribute *attr,
 			      char *buf)
 {
-	return snprintf(buf, 40, "%d\n", x86_pmu.attr_rdpmc);
+	return sysfs_emit(buf, "%d\n", x86_pmu.attr_rdpmc);
 }
 
 static ssize_t set_attr_rdpmc(struct device *cdev,
@@ -2597,7 +2597,7 @@ static ssize_t max_precise_show(struct device *cdev,
 				  struct device_attribute *attr,
 				  char *buf)
 {
-	return snprintf(buf, PAGE_SIZE, "%d\n", x86_pmu_max_precise());
+	return sysfs_emit(buf, "%d\n", x86_pmu_max_precise());
 }
 
 static DEVICE_ATTR_RO(max_precise);
-- 
2.29.2