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

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Message-ID: <20150807151303.GM16853@twins.programming.kicks-ass.net>
Date:	Fri, 7 Aug 2015 17:13:03 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Will Deacon <will.deacon@....com>
Cc:	linux-arch@...r.kernel.org, Waiman.Long@...com,
	linux-kernel@...r.kernel.org, paulmck@...ux.vnet.ibm.com,
	mingo@...nel.org
Subject: Re: [PATCH v5 0/8] Add generic support for relaxed atomics

On Thu, Aug 06, 2015 at 05:54:36PM +0100, Will Deacon wrote:
> Hi all,

> 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.

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