slab: make kmem_cache_flags accept 32-bit object size

Now that all sizes are properly typed, propagate "unsigned int" down the
callgraph.

Link: http://lkml.kernel.org/r/20180305200730.15812-19-adobriyan@gmail.com
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.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>

mm/slab.h

@@ -108,7 +108,7 @@ struct kmem_cache *
 __kmem_cache_alias(const char *name, unsigned int size, unsigned int align,
 		   slab_flags_t flags, void (*ctor)(void *));
 
-slab_flags_t kmem_cache_flags(unsigned long object_size,
+slab_flags_t kmem_cache_flags(unsigned int object_size,
 	slab_flags_t flags, const char *name,
 	void (*ctor)(void *));
 #else
@@ -117,7 +117,7 @@ __kmem_cache_alias(const char *name, unsigned int size, unsigned int align,
 		   slab_flags_t flags, void (*ctor)(void *))
 { return NULL; }
 
-static inline slab_flags_t kmem_cache_flags(unsigned long object_size,
+static inline slab_flags_t kmem_cache_flags(unsigned int object_size,
 	slab_flags_t flags, const char *name,
 	void (*ctor)(void *))
 {