[ping][PATCH][s390][ppc] Add REQUEUE_PI support

[Siddhesh Poyarekar]

On Fri, Feb 15, 2013 at 05:50:50PM -0600, Ryan S. Arnold wrote:
> I don't really understand this code base well enough to give you a
> worthwhile review.
> 
> Does the test-suite cover all of the corner cases that this code exposes?

Yes, I had written test cases while fixing corner case bugs for PI
mutex backed condition variables on x86 and those should work for all
architectures that implement this.

> In principle I don't see a problem with the code, and I don't want to
> be overly conservative.  I think it can go in if there are no
> regressions and I'll have my team try to stress the mechanism a bit.

Thanks, I'll commit this today.  I'll send out a separate email on
libc-ports announcing this so that other architectures can implement
PI support using this code.

Siddhesh