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net: net_{enable|disable}_timestamp() optimizations

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Adopting atomic_try_cmpxchg() makes the code cleaner.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2022-11-15 09:10:58 +00:00 committed by David S. Miller
parent 30189806fb
commit 6af645a5b2
1 changed files with 6 additions and 12 deletions
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18
net/core/dev.c
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@ -2073,13 +2073,10 @@ static DECLARE_WORK(netstamp_work, netstamp_clear);
void net_enable_timestamp(void)
{
#ifdef CONFIG_JUMP_LABEL
int wanted;
int wanted = atomic_read(&netstamp_wanted);
while (1) {
wanted = atomic_read(&netstamp_wanted);
if (wanted <= 0)
break;
if (atomic_cmpxchg(&netstamp_wanted, wanted, wanted + 1) == wanted)
while (wanted > 0) {
if (atomic_try_cmpxchg(&netstamp_wanted, &wanted, wanted + 1))
return;
}
atomic_inc(&netstamp_needed_deferred);
@ -2093,13 +2090,10 @@ EXPORT_SYMBOL(net_enable_timestamp);
void net_disable_timestamp(void)
{
#ifdef CONFIG_JUMP_LABEL
int wanted;
int wanted = atomic_read(&netstamp_wanted);
while (1) {
wanted = atomic_read(&netstamp_wanted);
if (wanted <= 1)
break;
if (atomic_cmpxchg(&netstamp_wanted, wanted, wanted - 1) == wanted)
while (wanted > 1) {
if (atomic_try_cmpxchg(&netstamp_wanted, &wanted, wanted - 1))
return;
}
atomic_dec(&netstamp_needed_deferred);