linux-kernel - Re: [PATCH 11/13] powerpc: Remove comment about read_barrier

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Date:   Wed, 20 Nov 2019 21:37:52 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org
Cc:     Will Deacon <will@...nel.org>, Yunjae Lee <lyj7694@...il.com>,
        SeongJae Park <sj38.park@...il.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Josh Triplett <josh@...htriplett.org>,
        Matt Turner <mattst88@...il.com>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Richard Henderson <rth@...ddle.net>,
        Peter Zijlstra <peterz@...radead.org>,
        Alan Stern <stern@...land.harvard.edu>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Arnd Bergmann <arnd@...db.de>, Joe Perches <joe@...ches.com>,
        Boqun Feng <boqun.feng@...il.com>, linux-alpha@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH 11/13] powerpc: Remove comment about read_barrier_depends()

Will Deacon <will@...nel.org> writes:
> 'read_barrier_depends()' doesn't exist anymore so stop talking about it.
>
> Signed-off-by: Will Deacon <will@...nel.org>
> ---
>  arch/powerpc/include/asm/barrier.h | 2 --
>  1 file changed, 2 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/barrier.h b/arch/powerpc/include/asm/barrier.h
> index fbe8df433019..123adcefd40f 100644
> --- a/arch/powerpc/include/asm/barrier.h
> +++ b/arch/powerpc/include/asm/barrier.h
> @@ -18,8 +18,6 @@
>   * mb() prevents loads and stores being reordered across this point.
>   * rmb() prevents loads being reordered across this point.
>   * wmb() prevents stores being reordered across this point.
> - * read_barrier_depends() prevents data-dependent loads being reordered
> - *	across this point (nop on PPC).

Acked-by: Michael Ellerman <mpe@...erman.id.au>

cheers