Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=fd74e6ccd522e2f26163eb5ac1abebcab2bd017c
Commit:     fd74e6ccd522e2f26163eb5ac1abebcab2bd017c
Parent:     eddc9ec53be2ecdbf4efe0efd4a83052594f0ac0
Author:     Stephen Hemminger <[EMAIL PROTECTED]>
AuthorDate: Mon Mar 12 16:25:32 2007 -0700
Committer:  David S. Miller <[EMAIL PROTECTED]>
CommitDate: Wed Apr 25 22:25:11 2007 -0700

    [BRIDGE]: faster compare for link local addresses
    
    Use logic operations rather than memcmp() to compare destination
    address with link local multicast addresses.
    
    Signed-off-by: Stephen Hemminger <[EMAIL PROTECTED]>
    Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
---
 net/bridge/br_input.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 35b94f9..a260679 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -112,7 +112,11 @@ static int br_handle_local_finish(struct sk_buff *skb)
  */
 static inline int is_link_local(const unsigned char *dest)
 {
-       return memcmp(dest, br_group_address, 5) == 0 && (dest[5] & 0xf0) == 0;
+       const u16 *a = (const u16 *) dest;
+       static const u16 *const b = (const u16 *const ) br_group_address;
+       static const u16 m = __constant_cpu_to_be16(0xfff0);
+
+       return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | ((a[2] ^ b[2]) & m)) == 0;
 }
 
 /*
-
To unsubscribe from this list: send the line "unsubscribe git-commits-head" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Reply via email to