[PATCH] slab: remove unused SL_CPU slab_stat_type

[Seongjun Hong]

Since the removal of the per-cpu slab in commit 32c894c7274b ("slab:
remove struct kmem_cache_cpu"), show_slab_objects() no longer has a
branch handling SO_CPU, so cpu_slabs_show() always produces "0".

Emit "0\n" directly instead, matching the sibling cpu_partial and
slabs_cpu_partial stubs, and remove the now-unused SO_CPU macro and
SL_CPU enum value.

No functional change intended; the cpu_slabs sysfs attribute continues
to read 0.

Signed-off-by: Seongjun Hong <hsj0512@xxxxxxxxx>
---
 mm/slub.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index 9ec774dc7009..f2eb60ce0d23 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -8992,14 +8992,12 @@ static void process_slab(struct loc_track *t, struct kmem_cache *s,
 enum slab_stat_type {
 	SL_ALL,			/* All slabs */
 	SL_PARTIAL,		/* Only partially allocated slabs */
-	SL_CPU,			/* Only slabs used for cpu caches */
 	SL_OBJECTS,		/* Determine allocated objects not slabs */
 	SL_TOTAL		/* Determine object capacity not slabs */
 };
 
 #define SO_ALL		(1 << SL_ALL)
 #define SO_PARTIAL	(1 << SL_PARTIAL)
-#define SO_CPU		(1 << SL_CPU)
 #define SO_OBJECTS	(1 << SL_OBJECTS)
 #define SO_TOTAL	(1 << SL_TOTAL)
 
@@ -9188,7 +9186,7 @@ SLAB_ATTR_RO(partial);
 
 static ssize_t cpu_slabs_show(struct kmem_cache *s, char *buf)
 {
-	return show_slab_objects(s, buf, SO_CPU);
+	return sysfs_emit(buf, "0\n");
 }
 SLAB_ATTR_RO(cpu_slabs);
 
-- 
2.43.0