linux-kernel - [PATCH v2] kcsan: Use min() to fix Coccinelle warning

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Date: Mon, 24 Jun 2024 19:57:28 +0200
From: Thorsten Blum <thorsten.blum@...lux.com>
To: elver@...gle.com,
	dvyukov@...gle.com
Cc: kasan-dev@...glegroups.com,
	linux-kernel@...r.kernel.org,
	paulmck@...nel.org,
	Thorsten Blum <thorsten.blum@...lux.com>
Subject: [PATCH v2] kcsan: Use min() to fix Coccinelle warning

Fixes the following Coccinelle/coccicheck warning reported by
minmax.cocci:

	WARNING opportunity for min()

Use const size_t instead of int for the result of min().

Compile-tested with CONFIG_KCSAN=y.

Reviewed-by: Marco Elver <elver@...gle.com>
Signed-off-by: Thorsten Blum <thorsten.blum@...lux.com>
---
Changes in v2:
- Add const and remove redundant parentheses as suggested by Marco Elver
---
 kernel/kcsan/debugfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/kcsan/debugfs.c b/kernel/kcsan/debugfs.c
index 1d1d1b0e4248..53b21ae30e00 100644
--- a/kernel/kcsan/debugfs.c
+++ b/kernel/kcsan/debugfs.c
@@ -225,7 +225,7 @@ debugfs_write(struct file *file, const char __user *buf, size_t count, loff_t *o
 {
 	char kbuf[KSYM_NAME_LEN];
 	char *arg;
-	int read_len = count < (sizeof(kbuf) - 1) ? count : (sizeof(kbuf) - 1);
+	const size_t read_len = min(count, sizeof(kbuf) - 1);
 
 	if (copy_from_user(kbuf, buf, read_len))
 		return -EFAULT;
-- 
2.45.2