ipv4: Simplify the allocation of slab caches in ip_rt_init

Use the new KMEM_CACHE() macro instead of direct kmem_cache_create
to simplify the creation of SLAB caches.
And change cache name from 'ip_dst_cache' to 'rtable'.
Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/route.c

@@ -3693,9 +3693,8 @@ int __init ip_rt_init(void)
 		panic("IP: failed to allocate ip_rt_acct\n");
 #endif
 
-	ipv4_dst_ops.kmem_cachep =
-		kmem_cache_create("ip_dst_cache", sizeof(struct rtable), 0,
-				  SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
+	ipv4_dst_ops.kmem_cachep = KMEM_CACHE(rtable,
+					      SLAB_HWCACHE_ALIGN | SLAB_PANIC);
 
 	ipv4_dst_blackhole_ops.kmem_cachep = ipv4_dst_ops.kmem_cachep;