net: make struct napi_alloc_cache::skb_count unsigned int

size_t is way too much for an integer not exceeding 64.

Space savings: 10 bytes!

add/remove: 0/0 grow/shrink: 0/3 up/down: 0/-10 (-10)
function old new delta
napi_consume_skb 165 163 -2
__kfree_skb_flush 56 53 -3
__kfree_skb_defer 97 92 -5
Total: Before=154865639, After=154865629, chg -0.00%

---

 net/core/skbuff.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -354,7 +354,7 @@ EXPORT_SYMBOL(build_skb);
 
 struct napi_alloc_cache {
 	struct page_frag_cache page;
-	size_t skb_count;
+	unsigned int skb_count;
 	void *skb_cache[NAPI_SKB_CACHE_SIZE];
 };
 

From: Alexey Dobriyan <[email protected]>
Date: Sat, 19 Nov 2016 03:47:56 +0300

Applied to net-next.