提交 35c7f6de 编写于 作者: E Eric Dumazet 提交者: David S. Miller

arp_tables: ifname_compare() can assume 16bit alignment

Arches without efficient unaligned access can still perform a loop
assuming 16bit alignment in ifname_compare()
Signed-off-by: NEric Dumazet <dada1@cosmosbay.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 8dd1d047
......@@ -76,6 +76,7 @@ static inline int arp_devaddr_compare(const struct arpt_devaddr_info *ap,
/*
* Unfortunatly, _b and _mask are not aligned to an int (or long int)
* Some arches dont care, unrolling the loop is a win on them.
* For other arches, we only have a 16bit alignement.
*/
static unsigned long ifname_compare(const char *_a, const char *_b, const char *_mask)
{
......@@ -95,10 +96,13 @@ static unsigned long ifname_compare(const char *_a, const char *_b, const char *
BUILD_BUG_ON(IFNAMSIZ > 4 * sizeof(unsigned long));
#else
unsigned long ret = 0;
const u16 *a = (const u16 *)_a;
const u16 *b = (const u16 *)_b;
const u16 *mask = (const u16 *)_mask;
int i;
for (i = 0; i < IFNAMSIZ; i++)
ret |= (_a[i] ^ _b[i]) & _mask[i];
for (i = 0; i < IFNAMSIZ/sizeof(u16); i++)
ret |= (a[i] ^ b[i]) & mask[i];
#endif
return ret;
}
......
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