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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>
This commit is contained in:
Eric Dumazet 2022-11-15 09:10:57 +00:00 committed by David S. Miller
parent 57fc05e8e8
commit 30189806fb
1 changed files with 3 additions and 4 deletions
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7
net/ipv6/ip6_fib.c
View File

@ -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;
}