Commit cdeeaaba authored by Vlastimil Babka's avatar Vlastimil Babka
Browse files

mm, slab: deprecate SLAB_MEM_SPREAD flag 



The SLAB_MEM_SPREAD flag used to be implemented in SLAB, which was
removed.  SLUB instead relies on the page allocator's NUMA policies.
Change the flag's value to 0 to free up the value it had, and mark it
for full removal once all users are gone.

Reported-by: default avatarSteven Rostedt <rostedt@goodmis.org>
Closes: https://lore.kernel.org/all/20240131172027.10f64405@gandalf.local.home/


Reviewed-and-tested-by: default avatarXiongwei Song <xiongwei.song@windriver.com>
Reviewed-by: default avatarChengming Zhou <chengming.zhou@linux.dev>
Reviewed-by: default avatarRoman Gushchin <roman.gushchin@linux.dev>
Acked-by: default avatarDavid Rientjes <rientjes@google.com>
Signed-off-by: default avatarVlastimil Babka <vbabka@suse.cz>
parent 6613476e

include/linux/slab.h

+3 −2
Original line number Diff line number Diff line
@@ -96,8 +96,6 @@ 
 */

/* Defer freeing slabs to RCU */

#define SLAB_TYPESAFE_BY_RCU	((slab_flags_t __force)0x00080000U)

/* Spread some memory over cpuset */

#define SLAB_MEM_SPREAD		((slab_flags_t __force)0x00100000U)

/* Trace allocations and frees */

#define SLAB_TRACE		((slab_flags_t __force)0x00200000U)
@@ -164,6 +162,9 @@ 
#endif

#define SLAB_TEMPORARY		SLAB_RECLAIM_ACCOUNT	/* Objects are short-lived */



/* Obsolete unused flag, to be removed */

#define SLAB_MEM_SPREAD		((slab_flags_t __force)0U)



/*

 * ZERO_SIZE_PTR will be returned for zero sized kmalloc requests.

 *

mm/slab.h

+0 −1
Original line number Diff line number Diff line
@@ -469,7 +469,6 @@ static inline bool is_kmalloc_cache(struct kmem_cache *s) 
			      SLAB_STORE_USER | \

			      SLAB_TRACE | \

			      SLAB_CONSISTENCY_CHECKS | \

			      SLAB_MEM_SPREAD | \

			      SLAB_NOLEAKTRACE | \

			      SLAB_RECLAIM_ACCOUNT | \

			      SLAB_TEMPORARY | \