slub: Remove objsize check in kmem_cache_flags()

There is no page->offset anymore and also no associated limit on the number
of objects. The page->offset field was removed for 2.6.24. So the check
in kmem_cache_flags() is now also obsolete (should have been dropped
earlier, somehow a hunk vanished).

Reviewed-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-by: Christoph Lameter <clameter@sgi.com>

diff --git a/mm/slub.c b/mm/slub.c
index e01d399..d7d0d86 100644 (file)
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -997,30 +997,11 @@ static unsigned long kmem_cache_flags(unsigned long objsize,
        void (*ctor)(struct kmem_cache *, void *))
 {
        /*
-        * The page->offset field is only 16 bit wide. This is an offset
-        * in units of words from the beginning of an object. If the slab
-        * size is bigger then we cannot move the free pointer behind the
-        * object anymore.
-        *
-        * On 32 bit platforms the limit is 256k. On 64bit platforms
-        * the limit is 512k.
-        *
-        * Debugging or ctor may create a need to move the free
-        * pointer. Fail if this happens.
+        * Enable debugging if selected on the kernel commandline.
         */
-       if (objsize >= 65535 * sizeof(void *)) {
-               BUG_ON(flags & (SLAB_RED_ZONE | SLAB_POISON |
-                               SLAB_STORE_USER | SLAB_DESTROY_BY_RCU));
-               BUG_ON(ctor);
-       } else {
-               /*
-                * Enable debugging if selected on the kernel commandline.
-                */
-               if (slub_debug && (!slub_debug_slabs ||
-                   strncmp(slub_debug_slabs, name,
-                       strlen(slub_debug_slabs)) == 0))
-                               flags |= slub_debug;
-       }
+       if (slub_debug && (!slub_debug_slabs ||
+           strncmp(slub_debug_slabs, name, strlen(slub_debug_slabs)) == 0))
+                       flags |= slub_debug;
 
        return flags;
 }