From: Mateusz Guzik <mjguzik@gmail.com>
Date: Wed, 19 Nov 2025 14:49:30 +0000 (+0100)
Subject: fs: mark lookup_slow() as noinline
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=8d79ec9e7f634e10c6cdc7f3999023bd988df1ad;p=thirdparty%2Flinux.git

fs: mark lookup_slow() as noinline

Otherwise it gets inlined notably in walk_component(), which convinces
the compiler to push/pop additional registers in the fast path to
accomodate existence of the inlined version.

Shortens the fast path of that routine from 87 to 71 bytes.

Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Link: https://patch.msgid.link/20251119144930.2911698-1-mjguzik@gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
---

diff --git a/fs/namei.c b/fs/namei.c
index 5fbb05fb96b75..efa592a981556 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1863,7 +1863,7 @@ again:
 	return dentry;
 }
 
-static struct dentry *lookup_slow(const struct qstr *name,
+static noinline struct dentry *lookup_slow(const struct qstr *name,
 				  struct dentry *dir,
 				  unsigned int flags)
 {