linux-kernel - [PATCH v1 2/4] initramfs: Refactor to use hex2bin() instead of custom approach

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Message-ID: <20260119204151.1447503-3-andriy.shevchenko@linux.intel.com>
Date: Mon, 19 Jan 2026 21:38:39 +0100
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Christian Brauner <brauner@...nel.org>,
	Petr Mladek <pmladek@...e.com>,
	linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Cc: Al Viro <viro@...iv.linux.org.uk>,
	Jan Kara <jack@...e.cz>,
	Steven Rostedt <rostedt@...dmis.org>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Sergey Senozhatsky <senozhatsky@...omium.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Disseldorp <ddiss@...e.de>
Subject: [PATCH v1 2/4] initramfs: Refactor to use hex2bin() instead of custom approach

There is a simple_strntoul() function used solely as a shortcut
for hex2bin() with proper endianess conversions. Replace that
and drop the unneeded function in the next changes.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 init/initramfs.c | 36 ++++++++++++++++++++----------------
 1 file changed, 20 insertions(+), 16 deletions(-)

diff --git a/init/initramfs.c b/init/initramfs.c
index 750f126e19a0..8d931ad4d239 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -6,6 +6,7 @@
 #include <linux/fcntl.h>
 #include <linux/file.h>
 #include <linux/fs.h>
+#include <linux/hex.h>
 #include <linux/init.h>
 #include <linux/init_syscalls.h>
 #include <linux/kstrtox.h>
@@ -21,6 +22,8 @@
 #include <linux/umh.h>
 #include <linux/utime.h>
 
+#include <asm/byteorder.h>
+
 #include "do_mounts.h"
 #include "initramfs_internal.h"
 
@@ -192,24 +195,25 @@ static __initdata u32 hdr_csum;
 
 static void __init parse_header(char *s)
 {
-	unsigned long parsed[13];
-	int i;
+	__be32 header[13];
+	int ret;
 
-	for (i = 0, s += 6; i < 13; i++, s += 8)
-		parsed[i] = simple_strntoul(s, NULL, 16, 8);
+	ret = hex2bin((u8 *)header, s + 6, sizeof(header));
+	if (ret)
+		error("damaged header");
 
-	ino = parsed[0];
-	mode = parsed[1];
-	uid = parsed[2];
-	gid = parsed[3];
-	nlink = parsed[4];
-	mtime = parsed[5]; /* breaks in y2106 */
-	body_len = parsed[6];
-	major = parsed[7];
-	minor = parsed[8];
-	rdev = new_encode_dev(MKDEV(parsed[9], parsed[10]));
-	name_len = parsed[11];
-	hdr_csum = parsed[12];
+	ino = be32_to_cpu(header[0]);
+	mode = be32_to_cpu(header[1]);
+	uid = be32_to_cpu(header[2]);
+	gid = be32_to_cpu(header[3]);
+	nlink = be32_to_cpu(header[4]);
+	mtime = be32_to_cpu(header[5]); /* breaks in y2106 */
+	body_len = be32_to_cpu(header[6]);
+	major = be32_to_cpu(header[7]);
+	minor = be32_to_cpu(header[8]);
+	rdev = new_encode_dev(MKDEV(be32_to_cpu(header[9]), be32_to_cpu(header[10])));
+	name_len = be32_to_cpu(header[11]);
+	hdr_csum = be32_to_cpu(header[12]);
 }
 
 /* FSM */
-- 
2.50.1