netdev - [PATCH net-next] fib: use __fls() on non null argument

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Date:	Tue, 07 Aug 2012 15:30:53 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>
Subject: [PATCH net-next] fib: use __fls() on non null argument

From: Eric Dumazet <edumazet@...gle.com>

__fls(x) is a bit faster than fls(x), granted we know x is non null.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/ipv4/fib_trie.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index f0cdb30..0bb20c4 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1550,7 +1550,7 @@ int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
 		 * state.directly.
 		 */
 		if (pref_mismatch) {
-			int mp = KEYLENGTH - fls(pref_mismatch);
+			int mp = KEYLENGTH - __fls(pref_mismatch);
 
 			if (tkey_extract_bits(cn->key, mp, cn->pos - mp) != 0)
 				goto backtrace;


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