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

[linux-2.6-omap-h63xx.git] / net / ipv4 / syncookies.c

diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index f470fe4511dbf6a03205e3690ff616dfdf2c8ffa..177da14f6b1454d64d9ec70d30b15415d392fc5b 100644 (file)
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -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;