[PATCH] fs: mark lookup_slow() as noinline

[Mateusz Guzik]

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@xxxxxxxxx>
---

The intent is to get to a point where I can inline walk_component and
step_into. This is probably the last patch of the sort before I write a
patchset + provide bench results.

 fs/namei.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/namei.c b/fs/namei.c
index 11295fcf877c..667360deef48 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1863,7 +1863,7 @@ static struct dentry *__lookup_slow(const struct qstr *name,
 	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)
 {
-- 
2.48.1