linux-kernel - [PATCH v2 2/2] seq_file: Simplify __seq

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Message-ID: <7cebc1412d8d1338a7e52cc9291d00f5368c14e4.1713781332.git.christophe.jaillet@wanadoo.fr>
Date: Mon, 22 Apr 2024 12:24:07 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: David.Laight@...LAB.COM,
	rasmus.villemoes@...vas.dk,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	Jan Kara <jack@...e.cz>
Cc: linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	linux-fsdevel@...r.kernel.org
Subject: [PATCH v2 2/2] seq_file: Simplify __seq_puts()

Change the implementation of the out-of-line __seq_puts() to simply be
a seq_write() call instead of duplicating the overflow/memcpy logic.

Suggested-by: Rasmus Villemoes <rasmus.villemoes@...vas.dk>
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
Changes in v2:
   - New patch

Now than most (if not all) seq_puts() calls will be turned into a
seq_write() or seq_putc() at compilation time, the added function call in
__seq_puts() should not be noticeable.

It could be even better to just remove this __seq_puts() and call
seq_write(m, s, strlen(s)) directly in seq_puts() if it can't be
optimized at compile time.
---
 fs/seq_file.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/fs/seq_file.c b/fs/seq_file.c
index 8ef0a07033ca..e676c8b0cf5d 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -671,14 +671,7 @@ EXPORT_SYMBOL(seq_putc);
 
 void __seq_puts(struct seq_file *m, const char *s)
 {
-	int len = strlen(s);
-
-	if (m->count + len >= m->size) {
-		seq_set_overflow(m);
-		return;
-	}
-	memcpy(m->buf + m->count, s, len);
-	m->count += len;
+	seq_write(m, s, strlen(s));
 }
 EXPORT_SYMBOL(__seq_puts);
 
-- 
2.44.0