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Re: [PATCH v5 0/8] Add generic support for relaxed atomics

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On Fri, Aug 07, 2015 at 04:13:03PM +0100, Peter Zijlstra wrote:
> On Thu, Aug 06, 2015 at 05:54:36PM +0100, Will Deacon wrote:
> > The series adds support for a family of relaxed atomics to the kernel.
> > More specifically:
> > 
> >   - acquire/release/relaxed flavours of xchg, cmpxchg and {add,sub}_return
> >   - atomic_read_acquire
> >   - atomic_set_release
> > 
> > This came out of a separate patch series porting the (barrier-heavy)
> > qrwlock code to arm64. Rather than have arch-specific hooks littered
> > around the place, it makes more sense to define a core set of relaxed
> > atomics that can be used regardless of architecture.
> > 
> > Changes since v4 are:
> > 
> >   * Drop the ret_t macro parameter in favour of typeof tricks (Peter Z)
> > 
> >   * Add a missing acquire to the qrwlock code, as it was based on a
> >     previous patch that I posted (Waiman Long)
> > 
> > Build tested on ARM, arm64, PowerPC and x86.
> 
> Queued it. There was a wee conflict with the atomic_{and,or,xor} bits
> for the ARM patch, but that was quickly sorted.

Great, thanks Peter! I'll port arm64 over for 4.4 (there's way too much
fun being had in asm/atomic.h right now).

> Does we want a Documentation/ update to reflect all this shiny new
> stuff?

Possibly. atomic_ops or memory-barriers?

Will
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[PATCH v5 0/8] Add generic support for relaxed atomics Will Deacon <will.deacon@arm.com> - 2015-08-06 19:00 +0200
  [PATCH v5 2/8] asm-generic: rework atomic-long.h to avoid bulk code duplication Will Deacon <will.deacon@arm.com> - 2015-08-06 19:00 +0200
    [tip:locking/core] locking, asm-generic:   Rework atomic-long.h to avoid bulk code duplication tip-bot for Will Deacon <tipbot@zytor.com> - 2015-08-12 14:40 +0200
  [PATCH v5 8/8] ARM: atomics: define our SMP atomics in terms of _relaxed operations Will Deacon <will.deacon@arm.com> - 2015-08-06 19:00 +0200
    [tip:locking/core] locking, ARM, atomics:   Define our SMP atomics in terms of _relaxed() operations tip-bot for Will Deacon <tipbot@zytor.com> - 2015-08-12 14:40 +0200
  [PATCH v5 5/8] locking/qrwlock: implement queue_write_unlock using smp_store_release Will Deacon <will.deacon@arm.com> - 2015-08-06 19:00 +0200
    [tip:locking/core] locking/qrwlock: Implement queue_write_unlock(  ) using smp_store_release() tip-bot for Will Deacon <tipbot@zytor.com> - 2015-08-12 14:40 +0200
  [PATCH v5 3/8] asm-generic: add relaxed/acquire/release variants for atomic_long_t Will Deacon <will.deacon@arm.com> - 2015-08-06 19:00 +0200
    [tip:locking/core] locking, asm-generic:   Add _{relaxed|acquire|release}() variants for 'atomic_long_t' tip-bot for Will Deacon <tipbot@zytor.com> - 2015-08-12 14:40 +0200
  [PATCH v5 1/8] atomics: add acquire/release/relaxed variants of some atomic operations Will Deacon <will.deacon@arm.com> - 2015-08-06 19:00 +0200
    [tip:locking/core] locking/atomics:   Add _{acquire|release|relaxed}() variants of some atomic operations tip-bot for Will Deacon <tipbot@zytor.com> - 2015-08-12 14:40 +0200
  [PATCH v5 6/8] locking/qrwlock: make use of acquire/release/relaxed atomics Will Deacon <will.deacon@arm.com> - 2015-08-06 19:00 +0200
    [tip:locking/core] locking/qrwlock:   Make use of _{acquire|release|relaxed}() atomics tip-bot for Will Deacon <tipbot@zytor.com> - 2015-08-12 14:40 +0200
  [PATCH v5 7/8] include/llist: use linux/atomic.h instead of asm/cmpxchg.h Will Deacon <will.deacon@arm.com> - 2015-08-06 19:00 +0200
    [tip:locking/core] locking, include/llist: Use linux/  atomic.h instead of asm/cmpxchg.h tip-bot for Will Deacon <tipbot@zytor.com> - 2015-08-12 14:40 +0200
  Re: [PATCH v5 0/8] Add generic support for relaxed atomics Peter Zijlstra <peterz@infradead.org> - 2015-08-07 17:20 +0200
    Re: [PATCH v5 0/8] Add generic support for relaxed atomics Will Deacon <will.deacon@arm.com> - 2015-08-07 18:30 +0200

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