Messages in this thread | | | Date | Fri, 22 Feb 2008 14:35:41 +0100 | From | Ingo Molnar <> | Subject | Re: [PATCH [RT] 05/14] rearrange rt_spin_lock sleep |
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* Gregory Haskins <gregory.haskins.ml@gmail.com> wrote:
> My assumption is that the xchg() (inside update_current()) acts as an > effective wmb(). If xchg() does not have this property, then this > code is broken and patch 6/14 should also add a:
xchg() is a strong implicit memory barrier, it implies smp_mb(). (historic sidenote: it was the very first SMP primitive we had in Linux.)
Ingo
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