slub: Remove node check in slab_free

We can set the page pointing in the percpu structure to
NULL to have the same effect as setting c->node to NUMA_NO_NODE.

Gets rid of one check in slab_free() that was only used for
forcing the slab_free to the slowpath for debugging.

We still need to set c->node to NUMA_NO_NODE to force the
slab_alloc() fastpath to the slowpath in case of debugging.

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/mm/slub.c b/mm/slub.c
index 9f7bb93e17ec..9ee6f515736d 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1881,6 +1881,8 @@ debug:
 
         page->inuse++;
         page->freelist = get_freepointer(s, object);
+        deactivate_slab(s, c);
+        c->page = NULL;
         c->node = NUMA_NO_NODE;
         goto unlock_out;
 }
@@ -2112,7 +2114,7 @@ redo:
         tid = c->tid;
         barrier();
 
-        if (likely(page == c->page && c->node != NUMA_NO_NODE)) {
+        if (likely(page == c->page)) {
                 set_freepointer(s, object, c->freelist);
 
                 if (unlikely(!this_cpu_cmpxchg_double(