mm: uninline kstrdup()

gcc inlines kstrdup into kstrdup_const() but it can very efficiently tail
call into it instead:

	$ ./scripts/bloat-o-meter ../vmlinux-000 ../obj/vmlinux
	add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-84 (-84)
	Function                                     old     new   delta
	kstrdup_const                                119      35     -84

Link: https://lkml.kernel.org/r/Y/4fDlbIhTLNLFHz@p183
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/util.c b/mm/util.c
index b8ed9dbc7fd55b4dea595e64718315e939fd9bb3..dd12b9531ac4cad5f37879c2412719b3724ecb78 100644 (file)
--- a/mm/util.c
+++ b/mm/util.c
@@ -49,6 +49,7 @@ EXPORT_SYMBOL(kfree_const);
  *
  * Return: newly allocated copy of @s or %NULL in case of error
  */
+noinline
 char *kstrdup(const char *s, gfp_t gfp)
 {
        size_t len;