percpu: fix spurious alignment WARN in legacy SMP percpu allocator

Impact: remove spurious WARN on legacy SMP percpu allocator

Commit f2a8205c4ef1af917d175c36a4097ae5587791c8 incorrectly added too
tight WARN_ON_ONCE() on alignments for UP and legacy SMP percpu
allocator.  Commit e317603694bfd17b28a40de9d65e1a4ec12f816e fixed it
for UP but legacy SMP allocator was forgotten.  Fix it.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Sachin P. Sant <sachinp@in.ibm.com>

diff --git a/mm/allocpercpu.c b/mm/allocpercpu.c
index 3653c57..1882923 100644 (file)
--- a/mm/allocpercpu.c
+++ b/mm/allocpercpu.c
@@ -120,7 +120,7 @@ void *__alloc_percpu(size_t size, size_t align)
         * on it.  Larger alignment should only be used for module
         * percpu sections on SMP for which this path isn't used.
         */
-       WARN_ON_ONCE(align > __alignof__(unsigned long long));
+       WARN_ON_ONCE(align > SMP_CACHE_BYTES);
 
        if (unlikely(!pdata))
                return NULL;