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SubjectRe: [PATCH -v4 1/2] lib, Make gen_pool memory allocator lockless
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On Wed, Nov 17, 2010 at 6:49 PM, Peter Zijlstra <peterz@infradead.org> wrote:
> On Wed, 2010-11-17 at 14:05 +0800, Huang Ying wrote:
>> Hi, Peter,
>>
>> Do you think think irq_work should depend on that?  Or we just
>> reimplement irq_work based on lockless list and make irq_work depends on
>> lockless list?
>
> If you can make it use a lockless list thing that's fine.

I will try to do that.

> I'm not sure Andrew's CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG makes much sense
> for CONFIG_ARCH_HAVE_NMI=n though..

Sorry, I do not find ARCH_HAVE_NMI in any Kconfig, can you help me to
point out? I think cmpxchg can be used safely in lock-less code on
architectures without NMI.

> Anyway, make sure to consolidate net/rds/xlist.h and its users, having
> two lockless lists is one too many.

Sure.

>> At least as the first step, I prefer to just make lockless list depend
>> on CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG.
>
> But only if the platform has NMIs, otherwise its moot.

Yes.

Best Regards,
Huang Ying
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