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The obsolete comment removed in this patch was introduced by
51df1142816e4 ("slub: Dynamically size kmalloc cache allocations").
I paste related modification from that commit:
+#ifdef CONFIG_NUMA
+ /*
+ * Allocate kmem_cache_node properly from the kmem_cache slab.
+ * kmem_cache_node is separately allocated so no need to
+ * update any list pointers.
+ */
+ temp_kmem_cache_node = kmem_cache_node;
+ kmem_cache_node = kmem_cache_alloc(kmem_cache, GFP_NOWAIT);
+ memcpy(kmem_cache_node, temp_kmem_cache_node, kmem_size);
+
+ kmem_cache_bootstrap_fixup(kmem_cache_node);
+
+ caches++;
+#else
+ /*
+ * kmem_cache has kmem_cache_node embedded and we moved it!
+ * Update the list heads
+ */
+ INIT_LIST_HEAD(&kmem_cache->local_node.partial);
+ list_splice(&temp_kmem_cache->local_node.partial, &kmem_cache->local_node.partial);
+#ifdef CONFIG_SLUB_DEBUG
+ INIT_LIST_HEAD(&kmem_cache->local_node.full);
+ list_splice(&temp_kmem_cache->local_node.full, &kmem_cache->local_node.full);
+#endif
As we can see there're used to distinguish the difference handling
between NUMA/non-NUMA configuration in the original commit. I think it
doesn't make any sense in current implementation which is placed above
kmem_cache_node = bootstrap(&boot_kmem_cache_node); So maybe it's better
to remove them now?
Link: http://lkml.kernel.org/r/5af26f58.1c69fb81.1be0e.c520SMTPIN_ADDED_BROKEN@mx.google.com
Signed-off-by: Canjiang Lu <canjiang.lu@samsung.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
05088e5de0