Re: locking/atomic: Introduce atomic_try_cmpxchg()

[Peter Zijlstra]

On Fri, Mar 24, 2017 at 12:08:32PM -0700, Linus Torvalds wrote:
> On Fri, Mar 24, 2017 at 10:23 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> >
> > I tried a few variants, but nothing really made it better.
> 
> So I really hate how your thing has two return values, and fakes the
> second one using the pointer value. 

Inspired by C11 I'm afraid..

> So how about we change the interface entirely, with the goal being
> both type safety and good code generation?

I certainly like it better, but so far I'm having trouble reproducing
your results. What compiler version are you on?