RE: Fix ia64 bitops: Full barrier on smp_mb__after_clear_bit()
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- To: "Chen, Kenneth W" <kenneth.w.chen@xxxxxxxxx>
- Subject: RE: Fix ia64 bitops: Full barrier on smp_mb__after_clear_bit()
- From: Christoph Lameter <clameter@xxxxxxx>
- Date: Fri, 31 Mar 2006 13:15:50 -0800 (PST)
- Cc: "Luck, Tony" <tony.luck@xxxxxxxxx>, linux-ia64@xxxxxxxxxxxxxxx, nickpiggin@xxxxxxxxxxxx, Zoltan Menyhart <Zoltan.Menyhart@xxxxxxxx>, "Boehm, Hans" <hans.boehm@xxxxxx>, "Grundler, Grant G" <grant.grundler@xxxxxx>, David Mosberger-Tang <David.Mosberger@xxxxxxx>
- In-reply-to: <200603311950.k2VJoWg05558@xxxxxxxxxxxxxxxxxxxx>
- References: <200603311950.k2VJoWg05558@xxxxxxxxxxxxxxxxxxxx>
On Fri, 31 Mar 2006, Chen, Kenneth W wrote:
> > /*
> > * clear_bit doesn't imply a memory barrier
> > */
> > #define smp_mb__before_clear_bit() smp_mb()
> > #define smp_mb__after_clear_bit() smp_mb()
>
>
> Using a totally different architecture to justify a change for ia64
> specific implementation is a bit strange to me. PPC has their own
> architecture limitation to deal with, why mix that with ia64?
Because clear_bit() on IA64 does not imply a memory barrier either.
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