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: Steven Rostedt <[email protected]> Closes: https://lore.kernel.org/all/[email protected]/ Reviewed-and-tested-by: Xiongwei Song <[email protected]> Reviewed-by: Chengming Zhou <[email protected]> Reviewed-by: Roman Gushchin <[email protected]> Acked-by: David Rientjes <[email protected]> Signed-off-by: Vlastimil Babka <[email protected]>
torvalds · Feb 26, 2024 · cdeeaab · cdeeaab
1 parent 6613476
commit cdeeaab
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Showing 2 changed files with 3 additions and 3 deletions.
diff --git 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 ((slab_flags_t __force)0U)
+
 /*
  * ZERO_SIZE_PTR will be returned for zero sized kmalloc requests.
  *

diff --git 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 | \