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authorEric Dumazet <edumazet@google.com>2022-11-15 09:10:57 +0000
committerDavid S. Miller <davem@davemloft.net>2022-11-16 12:42:00 +0000
commit30189806fbb945c4cb753878aab0aa5af07bc921 (patch)
tree4e86790355c780ba3915c9589640380192aad18b /net/ipv6
parent57fc05e8e82d015d5d58572e146ac8579a66efea (diff)
ipv6: fib6_new_sernum() optimization
Adopt atomic_try_cmpxchg() which is slightly more efficient. Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: David Ahern <dsahern@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/ip6_fib.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 413f66781e50..2438da5ff6da 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -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;
}