On Wed, 5 Sep 2012 12:26:49 +0300
"Michael S. Tsirkin" <m...@redhat.com> wrote:
> It's not guaranteed if another thread can modify the bitmap.
> Is this the case here? If yes we need at least ACCESS_ONCE.
In this patch, using the wrapper function to read out a register
value forces compilers not to do bad things. But I agree that
it is not a good API.
I would like to use fls() rather than ACCESS_ONCE if it's
really needed.
> > Anyway, I'm now thinking that we do not care about such
> > things here, and can just follow your advice, yes?
>
> Unless you see an issue with it ...
Although I read the code, I'm not sure.
But this code is apparently not so critical for performance
that we can simply use fls().
If I can remove likely() and use proper macros, that's enough
for me.
Thanks,
Takuya
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