[PATCH 1/3] mm, slab: deprecate SLAB_MEM_SPREAD flag

Vlastimil Babka
2024-02-20T16:58:46Z

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: Steven Rostedt <rostedt@goodmis.org>
Closes: https://lore.kernel.org/all/20240131172027.10f64405@gandalf.local.home/
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
---
include/linux/slab.h | 5 +++--
mm/slab.h | 1 -
2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/slab.h b/include/linux/slab.h
index b5f5ee8308d0..6252f44115c2 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -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 0
+
/*
* ZERO_SIZE_PTR will be returned for zero sized kmalloc requests.
*
diff --git a/mm/slab.h b/mm/slab.h
index 54deeb0428c6..f4534eefb35d 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -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 | \

--
2.43.1