[PATCH] drivers/perf: convert sysfs sprintf/snprintf family to sysfs_emit

[PATCH] drivers/perf: convert sysfs sprintf/snprintf family to sysfs_emit

[Jiapeng Chong]

Fix the following coccicheck warning:

./drivers/perf/arm-cci.c:708:8-16: WARNING: use scnprintf or sprintf.
./drivers/perf/arm-cci.c:699:8-16: WARNING: use scnprintf or sprintf.
./drivers/perf/arm-cci.c:528:8-16: WARNING: use scnprintf or sprintf.
./drivers/perf/arm-cci.c:309:8-16: WARNING: use scnprintf or sprintf.

Reported-by: Abaci Robot<abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
---
 drivers/perf/arm-cci.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/perf/arm-cci.c b/drivers/perf/arm-cci.c
index 87c4be9..efc39cb 100644
--- a/drivers/perf/arm-cci.c
+++ b/drivers/perf/arm-cci.c
@@ -306,7 +306,7 @@ static ssize_t cci400_pmu_cycle_event_show(struct device *dev,
 {
 	struct dev_ext_attribute *eattr = container_of(attr,
 				struct dev_ext_attribute, attr);
-	return snprintf(buf, PAGE_SIZE, "config=0x%lx\n", (unsigned long)eattr->var);
+	return sysfs_emit(buf, "config=0x%lx\n", (unsigned long)eattr->var);
 }
 
 static int cci400_get_event_idx(struct cci_pmu *cci_pmu,
@@ -525,8 +525,8 @@ static ssize_t cci5xx_pmu_global_event_show(struct device *dev,
 	struct dev_ext_attribute *eattr = container_of(attr,
 					struct dev_ext_attribute, attr);
 	/* Global events have single fixed source code */
-	return snprintf(buf, PAGE_SIZE, "event=0x%lx,source=0x%x\n",
-				(unsigned long)eattr->var, CCI5xx_PORT_GLOBAL);
+	return sysfs_emit(buf, "event=0x%lx,source=0x%x\n",
+			  (unsigned long)eattr->var, CCI5xx_PORT_GLOBAL);
 }
 
 /*
@@ -696,7 +696,7 @@ static ssize_t cci_pmu_format_show(struct device *dev,
 {
 	struct dev_ext_attribute *eattr = container_of(attr,
 				struct dev_ext_attribute, attr);
-	return snprintf(buf, PAGE_SIZE, "%s\n", (char *)eattr->var);
+	return sysfs_emit(buf, "%s\n", (char *)eattr->var);
 }
 
 static ssize_t cci_pmu_event_show(struct device *dev,
@@ -705,8 +705,7 @@ static ssize_t cci_pmu_event_show(struct device *dev,
 	struct dev_ext_attribute *eattr = container_of(attr,
 				struct dev_ext_attribute, attr);
 	/* source parameter is mandatory for normal PMU events */
-	return snprintf(buf, PAGE_SIZE, "source=?,event=0x%lx\n",
-					 (unsigned long)eattr->var);
+	return sysfs_emit(buf, "source=?,event=0x%lx\n", (unsigned long)eattr->var);
 }
 
 static int pmu_is_valid_counter(struct cci_pmu *cci_pmu, int idx)
-- 
1.8.3.1

Re: [PATCH] drivers/perf: convert sysfs sprintf/snprintf family to sysfs_emit

[Will Deacon]

On Thu, Feb 04, 2021 at 11:32:51AM +0800, Jiapeng Chong wrote:
> Fix the following coccicheck warning:
> 
> ./drivers/perf/arm-cci.c:708:8-16: WARNING: use scnprintf or sprintf.
> ./drivers/perf/arm-cci.c:699:8-16: WARNING: use scnprintf or sprintf.
> ./drivers/perf/arm-cci.c:528:8-16: WARNING: use scnprintf or sprintf.
> ./drivers/perf/arm-cci.c:309:8-16: WARNING: use scnprintf or sprintf.
> 
> Reported-by: Abaci Robot<abaci@linux.alibaba.com>
> Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
> ---
>  drivers/perf/arm-cci.c | 11 +++++------
>  1 file changed, 5 insertions(+), 6 deletions(-)

Looks like the same issue exists for other drivers under drivers/perf/. How
about fixing them all together?

Will