[PATCH] trivial: Fix name of biovec slab

From: Rusty Russell <rusty@rustcorp.com.au>

From:  "Chen, Kenneth W" <kenneth.w.chen@intel.com>

Pure cosmetic.  Largest biovec slab is printed as biovec-BIO_MAX_PAGES in
/proc/slabinfo.  It would be more informative to print actual number instead
of macro's name.

fs/bio.c

@@ -53,7 +53,7 @@ struct biovec_pool {
  * unsigned short
  */
 
-#define BV(x) { .nr_vecs = x, .name = "biovec-" #x }
+#define BV(x) { .nr_vecs = x, .name = "biovec-"__stringify(x) }
 static struct biovec_pool bvec_array[BIOVEC_NR_POOLS] = {
 	BV(1), BV(4), BV(16), BV(64), BV(128), BV(BIO_MAX_PAGES),
 };