linux-kernel - Re: [PATCH] locking/atomics/powerpc: Move cmpxchg helpers to asm/cmpxchg.h and define the full set of cmpxchg APIs

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Message-ID: <20180506121129.baacc4fxgr72rzex@gmail.com>
Date:   Sun, 6 May 2018 14:11:29 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Boqun Feng <boqun.feng@...il.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        aryabinin@...tuozzo.com, catalin.marinas@....com,
        dvyukov@...gle.com, will.deacon@....com
Subject: Re: [PATCH] locking/atomics/powerpc: Move cmpxchg helpers to
 asm/cmpxchg.h and define the full set of cmpxchg APIs


* Boqun Feng <boqun.feng@...il.com> wrote:

> > The only change I made beyond a trivial build fix is that I also added the release 
> > atomics variants explicitly:
> > 
> > +#define atomic_cmpxchg_release(v, o, n) \
> > +	cmpxchg_release(&((v)->counter), (o), (n))
> > +#define atomic64_cmpxchg_release(v, o, n) \
> > +	cmpxchg_release(&((v)->counter), (o), (n))
> > 
> > It has passed a PowerPC cross-build test here, but no runtime tests.
> > 
> 
> Do you have the commit at any branch in tip tree? I could pull it and
> cross-build and check the assembly code of lib/atomic64_test.c, that way
> I could verify whether we mess something up.
> 
> > Does this patch look good to you?
> > 
> 
> Yep!

Great - I have pushed the commits out into the locking tree, they can be found in:

  git fetch git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git locking/core

The PowerPC preparatory commit from you is:

  0476a632cb3a: locking/atomics/powerpc: Move cmpxchg helpers to asm/cmpxchg.h and define the full set of cmpxchg APIs

Thanks,

	Ingo