mm/slab_common.c: remove test if cache name is accessible

Since commit db265eca7700 ("mm/sl[aou]b: Move duping of slab name to
slab_common.c"), the kernel always duplicates the slab cache name when
creating a slab cache, so the test if the slab name is accessible is
useless.

Link: http://lkml.kernel.org/r/alpine.LRH.2.02.1803231133310.22626@file01.intranet.prod.int.rdu2.redhat.com
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/slab_common.c b/mm/slab_common.c
index 4a4bd71..2e682a4 100644 (file)
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -84,31 +84,12 @@ EXPORT_SYMBOL(kmem_cache_size);
 #ifdef CONFIG_DEBUG_VM
 static int kmem_cache_sanity_check(const char *name, unsigned int size)
 {
-       struct kmem_cache *s = NULL;
-
        if (!name || in_interrupt() || size < sizeof(void *) ||
                size > KMALLOC_MAX_SIZE) {
                pr_err("kmem_cache_create(%s) integrity check failed\n", name);
                return -EINVAL;
        }
 
-       list_for_each_entry(s, &slab_caches, list) {
-               char tmp;
-               int res;
-
-               /*
-                * This happens when the module gets unloaded and doesn't
-                * destroy its slab cache and no-one else reuses the vmalloc
-                * area of the module.  Print a warning.
-                */
-               res = probe_kernel_address(s->name, tmp);
-               if (res) {
-                       pr_err("Slab cache with size %u has lost its name\n",
-                              s->object_size);
-                       continue;
-               }
-       }
-
        WARN_ON(strchr(name, ' '));     /* It confuses parsers */
        return 0;
 }