RE: [Xen-devel] Re: [PATCH] Fix cpu offline bug

["Liu, Jinsong" <jinsong.liu@xxxxxxxxx>]

Jan, I'm not quite clear your meaning.
Why and where need to insert barrier, or volatile cpu_state?

Thanks,
Jinsong

Jan Beulich wrote:
>>>> On 05.03.11, Keir Fraser <keir.xen@xxxxxxxxx> wrote: Urk, good
>>>> point! 
> 
> But your fix still allows what the comment says it is supposed to
> avoid - simply introducing a variable doesn't help afaict, you also
> need to insert a barrier() to avoid a second read (or "cpu_state"
> would need to be volatile).
> 
> Jan
> 
> 
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