linux-kernel - [PATCH] dcache: Replace simple_strtoul with kstrtoul in set_dhash

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Message-ID: <20251216145236.44520-2-thorsten.blum@linux.dev>
Date: Tue, 16 Dec 2025 15:52:37 +0100
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	Jan Kara <jack@...e.cz>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] dcache: Replace simple_strtoul with kstrtoul in set_dhash_entries

Replace simple_strtoul() with the recommended kstrtoul() for parsing the
'dhash_entries=' boot parameter.

Check the return value of kstrtoul() and reject invalid values. This
adds error handling while preserving behavior for existing values, and
removes use of the deprecated simple_strtoul() helper.

Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>
---
 fs/dcache.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/fs/dcache.c b/fs/dcache.c
index dc2fff4811d1..ec275f4fd81c 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -3227,10 +3227,7 @@ EXPORT_SYMBOL(d_parent_ino);
 static __initdata unsigned long dhash_entries;
 static int __init set_dhash_entries(char *str)
 {
-	if (!str)
-		return 0;
-	dhash_entries = simple_strtoul(str, &str, 0);
-	return 1;
+	return kstrtoul(str, 0, &dhash_entries) == 0;
 }
 __setup("dhash_entries=", set_dhash_entries);
 
-- 
Thorsten Blum <thorsten.blum@...ux.dev>
GPG: 1D60 735E 8AEF 3BE4 73B6  9D84 7336 78FD 8DFE EAD4