Commit 30189806 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

ipv6: fib6_new_sernum() optimization 



Adopt atomic_try_cmpxchg() which is slightly more efficient.

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Cc: David Ahern <dsahern@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 57fc05e8

net/ipv6/ip6_fib.c

+3 −4
Original line number Diff line number Diff line
@@ -91,13 +91,12 @@ static void fib6_walker_unlink(struct net *net, struct fib6_walker *w) 


static int fib6_new_sernum(struct net *net)

{

	int new, old;

	int new, old = atomic_read(&net->ipv6.fib6_sernum);



	do {

		old = atomic_read(&net->ipv6.fib6_sernum);

		new = old < INT_MAX ? old + 1 : 1;

	} while (atomic_cmpxchg(&net->ipv6.fib6_sernum,

				old, new) != old);

	} while (!atomic_try_cmpxchg(&net->ipv6.fib6_sernum, &old, new));



	return new;

}