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[TCP]: lower stack usage in cookie_hash() function 

400 bytes allocated on stack might be a litle bit too much. Using a
per_cpu var is more friendly.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
This commit is contained in:
Eric Dumazet 2008-02-07 10:40:19 +01:00 committed by YOSHIFUJI Hideaki
parent 988b705077
commit 11baab7ac3
1 changed files with 3 additions and 1 deletions
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4
net/ipv4/syncookies.c
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@ -35,10 +35,12 @@ module_init(init_syncookies);
#define COOKIEBITS 24 /* Upper bits store count */
#define COOKIEMASK (((__u32)1 << COOKIEBITS) - 1)
static DEFINE_PER_CPU(__u32, cookie_scratch)[16 + 5 + SHA_WORKSPACE_WORDS];
static u32 cookie_hash(__be32 saddr, __be32 daddr, __be16 sport, __be16 dport,
u32 count, int c)
{
__u32 tmp[16 + 5 + SHA_WORKSPACE_WORDS];
__u32 *tmp = __get_cpu_var(cookie_scratch);
memcpy(tmp + 3, syncookie_secret[c], sizeof(syncookie_secret[c]));
tmp[0] = (__force u32)saddr;