csky: Use the bitmap API to allocate bitmaps

Use bitmap_zalloc()/bitmap_free() instead of hand-writing them.

It is less verbose and it improves the semantic.

While at it, turn a bitmap_clear() into an equivalent bitmap_zero(). It is
also less verbose.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Guo Ren <guoren@kernel.org>

arch/csky/mm/asid.c

@@ -27,7 +27,7 @@ static void flush_context(struct asid_info *info)
 	u64 asid;
 
 	/* Update the list of reserved ASIDs and the ASID bitmap. */
-	bitmap_clear(info->map, 0, NUM_CTXT_ASIDS(info));
+	bitmap_zero(info->map, NUM_CTXT_ASIDS(info));
 
 	for_each_possible_cpu(i) {
 		asid = atomic64_xchg_relaxed(&active_asid(info, i), 0);
@@ -178,8 +178,7 @@ int asid_allocator_init(struct asid_info *info,
 	 */
 	WARN_ON(NUM_CTXT_ASIDS(info) - 1 <= num_possible_cpus());
 	atomic64_set(&info->generation, ASID_FIRST_VERSION(info));
-	info->map = kcalloc(BITS_TO_LONGS(NUM_CTXT_ASIDS(info)),
-			    sizeof(*info->map), GFP_KERNEL);
+	info->map = bitmap_zalloc(NUM_CTXT_ASIDS(info), GFP_KERNEL);
 	if (!info->map)
 		return -ENOMEM;