RFR (XXS): 8033545: Missing volatile specifier in Bitmap::par_put_range_within_word

[Thomas Schatzl]

Hi Bengt,

  thanks for the review.

On Wed, 2014-02-05 at 10:08 +0100, Bengt Rutisson wrote:
> Hi Thomas and Matthias,
> 
> The change looks good.
> 
> But just to be clear. The original suggestion was to make pw volatile, 
> but instead you fixed it by using the return value of 
> Atomic::cmpxchg_ptr(). I think that is fine, but I wanted to make sure 

That's true, it has been solved differently, with the same effect.

Atomic:cmpxchg_ptr() already returns the original value, so there is no
need to reload it from the source (using the volatile pointer).
That's actually a very common pattern in other uses.

In the places I tracked down in the other CR this should (imo) be the
recommended way to fix the issues.

> that I understood the fix properly. Or did I miss something? If my 
> understanding is correct we should maybe update the CR with a comment 
> saying that it was fixed in a different way.

Will do.

> Thanks for filing the CR to track down similar issues.

Thanks,
Thomas