linux-kernel - [PATCH v2] arch/arm/mm: Convert snprintf to sysfs

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Message-Id: <20240124023442.105333-1-lizhijian@fujitsu.com>
Date: Wed, 24 Jan 2024 10:34:42 +0800
From: Li Zhijian <lizhijian@...itsu.com>
To: linux-kernel@...r.kernel.org
Cc: Li Zhijian <lizhijian@...itsu.com>,
	Russell King <linux@...linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v2] arch/arm/mm: 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/arm/mm/cache-l2x0-pmu.c:346:8-16: WARNING: please use sysfs_emit or sysfs_emit_at

This patch is generated by
make coccicheck MODE=patch COCCI=scripts/coccinelle/api/device_attr_show.cocci

No functional change intended

CC: Russell King <linux@...linux.org.uk>
CC: linux-arm-kernel@...ts.infradead.org
Signed-off-by: Li Zhijian <lizhijian@...itsu.com>
---
V2: extract patch from the patch set[1] so that maintainer can accept it separately.
[1] https://lore.kernel.org/lkml/20240116041129.3937800-1-lizhijian@fujitsu.com/
---
 arch/arm/mm/cache-l2x0-pmu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/mm/cache-l2x0-pmu.c b/arch/arm/mm/cache-l2x0-pmu.c
index 993fefdc167a..a9bd05b82003 100644
--- a/arch/arm/mm/cache-l2x0-pmu.c
+++ b/arch/arm/mm/cache-l2x0-pmu.c
@@ -343,7 +343,7 @@ static ssize_t l2x0_pmu_event_show(struct device *dev,
 	struct l2x0_event_attribute *lattr;
 
 	lattr = container_of(attr, typeof(*lattr), attr);
-	return snprintf(buf, PAGE_SIZE, "config=0x%x\n", lattr->config);
+	return sysfs_emit(buf, "config=0x%x\n", lattr->config);
 }
 
 static umode_t l2x0_pmu_event_attr_is_visible(struct kobject *kobj,
-- 
2.29.2