netdev - Re: [mm PATCH v2 18/26] arch/powerpc: Add option to skip DMA sync as a part of mapping

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Message-ID: <87twbolytq.fsf@concordia.ellerman.id.au>
Date:   Fri, 04 Nov 2016 14:16:01 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Alexander Duyck <alexander.h.duyck@...el.com>, linux-mm@...ck.org,
        akpm@...ux-foundation.org
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
        netdev@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [mm PATCH v2 18/26] arch/powerpc: Add option to skip DMA sync as a part of mapping

Alexander Duyck <alexander.h.duyck@...el.com> writes:

> This change allows us to pass DMA_ATTR_SKIP_CPU_SYNC which allows us to
> avoid invoking cache line invalidation if the driver will just handle it
> via a sync_for_cpu or sync_for_device call.
>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: linuxppc-dev@...ts.ozlabs.org
> Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
> ---
>  arch/powerpc/kernel/dma.c |    9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)

LGTM.

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

cheers