Re: [PATCH 2/2] net/tcp: Disable TCP-MD5 static key on tcp_md5sig_info destruction

On Wed, Nov 2, 2022 at 2:49 PM Eric Dumazet [off-list ref] wrote:

Are you sure ?

static_branch_inc() is what we want here, it is a nice wrapper around
the correct internal details,
and ultimately boils to an atomic_inc(). It is safe for all contexts.

But if/when jump labels get refcount_t one day, we will not have to
change TCP stack because
it made some implementation assumptions.

Oh, I think I understand this better now.

Please provide a helper like

static inline void static_key_fast_inc(struct static_key *key)
{
       atomic_inc(&key->enabled);
}

Something like that.