linux-kernel - [PATCH RESEND] init: Replace simple_strtoul with kstrtoul to improve lpj

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Message-ID: <20251122114539.446937-2-thorsten.blum@linux.dev>
Date: Sat, 22 Nov 2025 12:45:37 +0100
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: Christian Brauner <brauner@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
	linux-kernel@...r.kernel.org
Subject: [PATCH RESEND] init: Replace simple_strtoul with kstrtoul to improve lpj_setup

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

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

Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>
---
 init/calibrate.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/init/calibrate.c b/init/calibrate.c
index f3831272f113..09c2e6102110 100644
--- a/init/calibrate.c
+++ b/init/calibrate.c
@@ -14,10 +14,10 @@
 
 unsigned long lpj_fine;
 unsigned long preset_lpj;
+
 static int __init lpj_setup(char *str)
 {
-	preset_lpj = simple_strtoul(str,NULL,0);
-	return 1;
+	return kstrtoul(str, 0, &preset_lpj) == 0;
 }
 
 __setup("lpj=", lpj_setup);
-- 
2.51.1