From: Arnd Bergmann <arnd@xxxxxxxx> Subject: mm/slab_common.c: work around clang bug #42570 Clang gets rather confused about two variables in the same special section when one of them is not initialized, leading to an assembler warning later: /tmp/slab_common-18f869.s: Assembler messages: /tmp/slab_common-18f869.s:7526: Warning: ignoring changed section attributes for .data..ro_after_init Adding an initialization to kmalloc_caches is rather silly here but does avoid the issue. Link: https://bugs.llvm.org/show_bug.cgi?id=42570 Link: http://lkml.kernel.org/r/20190712090455.266021-1-arnd@xxxxxxxx Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx> Acked-by: David Rientjes <rientjes@xxxxxxxxxx> Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: Christoph Lameter <cl@xxxxxxxxx> Cc: Pekka Enberg <penberg@xxxxxxxxxx> Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> Cc: Roman Gushchin <guro@xxxxxx> Cc: Shakeel Butt <shakeelb@xxxxxxxxxx> Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx> Cc: Andrey Konovalov <andreyknvl@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/slab_common.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/mm/slab_common.c~slab-work-around-clang-bug-42570 +++ a/mm/slab_common.c @@ -1028,7 +1028,8 @@ struct kmem_cache *__init create_kmalloc } struct kmem_cache * -kmalloc_caches[NR_KMALLOC_TYPES][KMALLOC_SHIFT_HIGH + 1] __ro_after_init; +kmalloc_caches[NR_KMALLOC_TYPES][KMALLOC_SHIFT_HIGH + 1] __ro_after_init = +{ /* initialization for https://bugs.llvm.org/show_bug.cgi?id=42570 */ }; EXPORT_SYMBOL(kmalloc_caches); /* _
