On Sun, Dec 20, 2015 at 05:07:19PM +0000, Andrew Cooper wrote:
>
> Very much +1 for fixing this.
>
> Those names would be fine, but they do add yet another set of options in
> an already-complicated area.
>
> An alternative might be to have the regular smp_{w,r,}mb() not revert
> back to nops if CONFIG_PARAVIRT, or perhaps if pvops have detected a
> non-native environment. (I don't know how feasible this suggestion is,
> however.)
So a regular SMP kernel emits the LOCK prefix and will patch it out with
a DS prefix (iirc) when it finds but a single CPU. So for those you
could easily do this.
However an UP kernel will not emit the LOCK and do no patching.
So if you're willing to make CONFIG_PARAVIRT depend on CONFIG_SMP or
similar, this is doable.
I don't see people going to allow emitting the LOCK prefix (and growing
the kernel text size) for UP kernels.
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