slab: fix slab flags for archs use alignment larger 64-bit

I think, this fix is necessary for all the architectures want to perform DMA into kmalloc caches and need a guaranteed alignment larger than the alignment of a 64-bit integer.
An example is sh architecture where ARCH_KMALLOC_MINALIGN is L1_CACHE_BYTES.

As side effect, these kind of objects cannot be visible within the /proc/slab_allocators file.

Signed-off-by Giuseppe Cavallaro <[email protected]>

---
 mm/slab.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

mm/slab.c +1 -1

index ddc41f3..031d785 100644
@@ -2262,7 +2262,7 @@ kmem_cache_create (const char *name, size_t size, size_t align,
 		ralign = align;
 	}
 	/* disable debug if necessary */
-	if (ralign > __alignof__(unsigned long long))
+	if (ralign > ARCH_KMALLOC_MINALIGN)
 		flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER);
 	/*
 	 * 4) Store it.