Commit 79cda75a authored Aug 07, 2012 by Eric Dumazet Committed by David S. Miller Aug 07, 2012

fib: use __fls() on non null argument



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

As Ben Hutchings pointed out, fls(x) = __fls(x) + 1

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 425f09ab

net/ipv4/fib_trie.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -1550,7 +1550,8 @@ int fib_table_lookup(struct fib_table tb, const struct flowi4 flp,
		* state.directly.
		*/
		if (pref_mismatch) {
		int mp = KEYLENGTH - fls(pref_mismatch);
		/* fls(x) = __fls(x) + 1 */
		int mp = KEYLENGTH - __fls(pref_mismatch) - 1;

		if (tkey_extract_bits(cn->key, mp, cn->pos - mp) != 0)
		goto backtrace;