linux-kernel - [PATCH 5/5] fs/fs_context: Mark an unlikely if condition with unlikely() in vfs_parse_monolithic

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Message-Id: <20250410-fix_fs-v1-5-7c14ccc8ebaa@quicinc.com>
Date: Thu, 10 Apr 2025 19:45:31 +0800
From: Zijun Hu <zijun_hu@...oud.com>
To: Alexander Viro <viro@...iv.linux.org.uk>, 
 Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>, 
 David Howells <dhowells@...hat.com>
Cc: Zijun Hu <zijun_hu@...oud.com>, linux-fsdevel@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Zijun Hu <quic_zijuhu@...cinc.com>
Subject: [PATCH 5/5] fs/fs_context: Mark an unlikely if condition with
 unlikely() in vfs_parse_monolithic_sep()

From: Zijun Hu <quic_zijuhu@...cinc.com>

There is no mount option with pattern "...,=key_or_value,...", so the if
condition '(value == key)' in while loop of vfs_parse_monolithic_sep() is
is unlikely true.

Mark the condition with unlikely() to improve both performance and
readability.

Signed-off-by: Zijun Hu <quic_zijuhu@...cinc.com>
---
 fs/fs_context.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/fs_context.c b/fs/fs_context.c
index 582d33e8111739402d38dc9fc268e7d14ced3c49..284301d88bc90ef462a08c9ea893f822075a6d4d 100644
--- a/fs/fs_context.c
+++ b/fs/fs_context.c
@@ -222,7 +222,7 @@ int vfs_parse_monolithic_sep(struct fs_context *fc, void *data,
 			char *value = strchr(key, '=');
 
 			if (value) {
-				if (value == key)
+				if (unlikely(value == key))
 					continue;
 				*value++ = 0;
 				v_len = strlen(value);

-- 
2.34.1