slab: make create_boot_cache() work with 32-bit sizes

struct kmem_cache::size has always been "int", all those
"size_t size" are fake.

Link: http://lkml.kernel.org/r/20180305200730.15812-5-adobriyan@gmail.com
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/slab.h

@@ -97,8 +97,8 @@ struct kmem_cache *create_kmalloc_cache(const char *name, unsigned int size,
 			slab_flags_t flags, unsigned int useroffset,
 			unsigned int usersize);
 extern void create_boot_cache(struct kmem_cache *, const char *name,
-			size_t size, slab_flags_t flags, size_t useroffset,
-			size_t usersize);
+			unsigned int size, slab_flags_t flags,
+			unsigned int useroffset, unsigned int usersize);
 
 int slab_unmergeable(struct kmem_cache *s);
 struct kmem_cache *find_mergeable(size_t size, size_t align,

mm/slab_common.c

@@ -917,8 +917,9 @@ bool slab_is_available(void)
 
 #ifndef CONFIG_SLOB
 /* Create a cache during boot when no slab services are available yet */
-void __init create_boot_cache(struct kmem_cache *s, const char *name, size_t size,
-		slab_flags_t flags, size_t useroffset, size_t usersize)
+void __init create_boot_cache(struct kmem_cache *s, const char *name,
+		unsigned int size, slab_flags_t flags,
+		unsigned int useroffset, unsigned int usersize)
 {
 	int err;
 
@@ -933,7 +934,7 @@ void __init create_boot_cache(struct kmem_cache *s, const char *name, size_t siz
 	err = __kmem_cache_create(s, flags);
 
 	if (err)
-		panic("Creation of kmalloc slab %s size=%zu failed. Reason %d\n",
+		panic("Creation of kmalloc slab %s size=%u failed. Reason %d\n",
 					name, size, err);
 
 	s->refcount = -1;	/* Exempt from merging for now */