net: use 32-bit arithmetic while allocating net device

Alexey Dobriyan · davem330 · commit 52a59bd509e3 · 2017-09-22T21:25:52.000-07:00
Private part of allocation is never big enough to warrant size_t.

Space savings:

	add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-10 (-10)
	function                                     old     new   delta
	alloc_netdev_mqs                            1120    1110     -10

Signed-off-by: Alexey Dobriyan &lt;adobriyan@gmail.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
diff --git a/net/core/dev.c b/net/core/dev.c
@@ -7989,7 +7989,7 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
 		unsigned int txqs, unsigned int rxqs)
 {
 	struct net_device *dev;
-	size_t alloc_size;
+	unsigned int alloc_size;
 	struct net_device *p;
 
 	BUG_ON(strlen(name) >= sizeof(dev->name));

Original file line number	Diff line number	Diff line change
`@@ -7989,7 +7989,7 @@ struct net_device alloc_netdev_mqs(int sizeof_priv, const char name,`
`7989`	`7989`	`unsigned int txqs, unsigned int rxqs)`
`7990`	`7990`	`{`
`7991`	`7991`	`struct net_device *dev;`
`7992`		`- size_t alloc_size;`
	`7992`	`+ unsigned int alloc_size;`
`7993`	`7993`	`struct net_device *p;`
`7994`	`7994`
`7995`	`7995`	`BUG_ON(strlen(name) >= sizeof(dev->name));`