Re: [patch] spinlocks: remove 'volatile'

Arjan van de Ven
2006-07-08T09:52:27Z

On Sat, 2006-07-08 at 05:45 -0400, Joe Korty wrote:
> On Fri, Jul 07, 2006 at 11:54:10PM -0400, Albert Cahalan wrote:
> > That's all theoretical though. Today, gcc's volatile does
> > not follow the C standard on modern hardware. Bummer.
> > It'd be low-performance anyway though.
>
> But gcc would follow the standard if it emitted a 'lock'
> insn on every volatile reference.

nope that's not nearly enough for pci MMIO space for example, nor for
any of the weakly ordered architectures.