Re: [PATCH v4 0/3] qspinlock: Introducing a 4-byte queue spinlock

[Linus Torvalds]

On Wed, Feb 19, 2014 at 11:24 AM, Waiman Long <waiman.long@xxxxxx> wrote:
>
> We do have a CONFIG_PARAVIRT macro that turns on or off PV support. The
> queue spinlock can be easily changed into an unfair lock which allows lock
> stealing. We could have a config option to make it unfair in the PARAVIRT
> environment, but I don't think Linus like the idea of an unfair lock.

I could care less for the paravirt case. As long as the native case
ends up being sane (even when CONFIG_PARAVIRT is set at compile time),
I'm fine.

When actually running in a paravirtualized environment, locks are
always going to have problems.

                  Linus
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