On Thu, Feb 03, 2005 at 02:19:01PM -0800, David S. Miller wrote:
>
> They are for cases where you want strict ordering even for the
> non-return-value-giving atomic_t ops.
I see. I got atomic_dec and atomic_dec_and_test mixed up.
So the problem isn't as big as I thought which is good. sk_buff
is only in trouble because of the atomic_read optimisation which
really needs a memory barrier.
However, instead of adding a memory barrier which makes the optimisation
less useful, let's just get rid of the atomic_read.
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Thanks for the document, it's really helpful.
Cheers,
--
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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