On Tue, Sep 06, 2022 at 04:11:58PM -0700, Eric Dumazet wrote:

WRITE_ONCE(sysctl_tcp_authopt, val),  or even better:

if (val)
     cmpxchg(&sysctl_tcp_authopt, 0, val);

What's the point of the cmpxchg? Since you're simply trying to prevent
sysctl_tcp_authopt from going back to zero, then the if clause
by itself is enough:

	if (val)
		WRITE_ONCE(sysctl_tcp_authopt, val);

Cheers,
-- 
Email: Herbert Xu [off-list ref]
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