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Re: [PATCH 01/14] locking/atomic: import atomic_dec_not_zero()

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [PATCH 01/14] locking/atomic: import atomic_dec_not_zero()
Date 2017-01-31 20:20 +0100
Message-ID <t5M89-4ww-3@gated-at.bofh.it> (permalink)
References <t5pbA-7p2-35@gated-at.bofh.it> <t5EaC-84y-21@gated-at.bofh.it> <t5KJ4-3yR-21@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Tue, Jan 31, 2017 at 06:41:28PM +0100, Fabian Frederick wrote:
> 
> 
> > On 31 January 2017 at 11:41 Peter Zijlstra <peterz@infradead.org> wrote:
> >
> >
> > On Mon, Jan 30, 2017 at 07:39:38PM +0100, Fabian Frederick wrote:
> > > complementary definition to atomic_inc_not_zero() featured in
> > > lib/fault-inject.c
> >
> > Why?
> 
> Maybe this commit message should be ok ?
> 
> complementary definition to atomic_inc_not_zero() featured in lib/fault-inject.c
> and is more readable than atomic_add_unless((v), -1, 0) used in different
> places.

I still don't see why such a primitive makes sense. Yes there's a few
usage sites, but from them I don't see a sensible pattern.

What sane pattern desires this?

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Thread

[PATCH 01/14] locking/atomic: import atomic_dec_not_zero() Fabian Frederick <fabf@skynet.be> - 2017-01-30 19:50 +0100
  Re: [PATCH 01/14] locking/atomic: import atomic_dec_not_zero() Ingo Molnar <mingo@kernel.org> - 2017-01-31 08:40 +0100
  Re: [PATCH 01/14] locking/atomic: import atomic_dec_not_zero() Peter Zijlstra <peterz@infradead.org> - 2017-01-31 11:50 +0100
    Re: [PATCH 01/14] locking/atomic: import atomic_dec_not_zero() Fabian Frederick <fabf@skynet.be> - 2017-01-31 18:50 +0100
      Re: [PATCH 01/14] locking/atomic: import atomic_dec_not_zero() Peter Zijlstra <peterz@infradead.org> - 2017-01-31 20:20 +0100
        Re: [PATCH 01/14] locking/atomic: import atomic_dec_not_zero() Fabian Frederick <fabf@skynet.be> - 2017-01-31 22:00 +0100
          Re: [PATCH 01/14] locking/atomic: import atomic_dec_not_zero() Peter Zijlstra <peterz@infradead.org> - 2017-02-01 10:30 +0100
            Re: [PATCH 01/14] locking/atomic: import atomic_dec_not_zero() Fabian Frederick <fabf@skynet.be> - 2017-02-01 20:30 +0100

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