lkml.org 
[lkml]   [2022]   [Sep]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] mm: slub: remove dead and buggy code from sysfs_slab_add()
Date
The function sysfs_slab_add() has two callers:

One is slab_sysfs_init(), which first initializes slab_kset, and only
when that succeeds sets slab_state to FULL, and then proceeds to call
sysfs_slab_add() for all previously created slabs.

The other is __kmem_cache_create(), but only after a

if (slab_state <= UP)
return 0;

check.

So in other words, sysfs_slab_add() is never called without
slab_kset (aka the return value of cache_kset()) being non-NULL.

And this is just as well, because if we ever did take this path and
called kobject_init(&s->kobj), and then later when called again from
slab_sysfs_init() would end up calling kobject_init_and_add(), we
would hit

if (kobj->state_initialized) {
/* do not error out as sometimes we can recover */
pr_err("kobject (%p): tried to init an initialized object, something is seriously wrong.\n",
dump_stack();
}

in kobject.c.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
---
mm/slub.c | 5 -----
1 file changed, 5 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index 4b98dff9be8e..04a7f75a7b1f 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -5937,11 +5937,6 @@ static int sysfs_slab_add(struct kmem_cache *s)
struct kset *kset = cache_kset(s);
int unmergeable = slab_unmergeable(s);

- if (!kset) {
- kobject_init(&s->kobj, &slab_ktype);
- return 0;
- }
-
if (!unmergeable && disable_higher_order_debug &&
(slub_debug & DEBUG_METADATA_FLAGS))
unmergeable = 1;
--
2.37.2
\
 
 \ /
  Last update: 2022-09-30 10:48    [W:0.060 / U:0.276 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site