From: Arnd Bergmann arnd@arndb.de
[ Upstream commit a07057dce2823e10d64a2b73cefbf09d8645efe9 ]
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@arndb.de Signed-off-by: Arnd Bergmann arnd@arndb.de Acked-by: David Rientjes rientjes@google.com Reviewed-by: Andrew Morton akpm@linux-foundation.org Cc: Christoph Lameter cl@linux.com Cc: Pekka Enberg penberg@kernel.org Cc: Joonsoo Kim iamjoonsoo.kim@lge.com Cc: Stephen Rothwell sfr@canb.auug.org.au Cc: Roman Gushchin guro@fb.com Cc: Shakeel Butt shakeelb@google.com Cc: Vladimir Davydov vdavydov.dev@gmail.com Cc: Andrey Konovalov andreyknvl@google.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- mm/slab_common.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/slab_common.c b/mm/slab_common.c index 58251ba63e4a..cbd3411f644e 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -1003,7 +1003,8 @@ struct kmem_cache *__init create_kmalloc_cache(const char *name, }
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);
/*