mm/slub: Define struct slab fields for CONFIG_SLUB_CPU_PARTIAL only when enabled
The fields 'next' and 'slabs' are only used when CONFIG_SLUB_CPU_PARTIAL
is enabled. We can put their definition to #ifdef to prevent accidental
use when disabled.
Currenlty show_slab_objects() and slabs_cpu_partial_show() contain code
accessing the slabs field that's effectively dead with
CONFIG_SLUB_CPU_PARTIAL=n through the wrappers slub_percpu_partial() and
slub_percpu_partial_read_once(), but to prevent a compile error, we need
to hide all this code behind #ifdef.
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Reviewed-by: Roman Gushchin <guro@fb.com>
Tested-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
diff --git a/mm/slab.h b/mm/slab.h
index 495008f..f14e723 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -25,10 +25,12 @@ struct slab {
union {
struct list_head slab_list;
struct rcu_head rcu_head;
+#ifdef CONFIG_SLUB_CPU_PARTIAL
struct {
struct slab *next;
int slabs; /* Nr of slabs left */
};
+#endif
};
struct kmem_cache *slab_cache;
/* Double-word boundary */
