Re: [PATCH -v4 1/2] lib, Make gen_pool memory allocator lockless

[Peter Zijlstra]

On Wed, 2010-11-17 at 19:47 +0800, huang ying wrote:
> On Wed, Nov 17, 2010 at 6:40 PM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> > On Wed, 2010-11-17 at 10:18 +0800, Huang Ying wrote:
> >>
> >> cmpxchg has been used in that way by ftrace and perf for a long time. So
> >> I agree to make it a requirement on future architecture ports.
> >
> > Neither mandate an architecture do this though, only that when an
> > architecture wants to support either feature and has NMIs (not all archs
> > have NMI equivalents) it has to be safe.
> 
> So we can make sure cmpxchg can be used in lock-less code on
> architectures with perf, irq_work or ftrace enabled?

It had better, otherwise stuff is broken.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/