linux-kernel - Re: [PATCH AUTOSEL 5.2 42/76] drm/msm: stop abusing dma

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Message-ID: <20190814020314.GG17747@sasha-vm>
Date:   Tue, 13 Aug 2019 22:03:14 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Rob Clark <robdclark@...omium.org>
Cc:     LKML <linux-kernel@...r.kernel.org>, stable@...r.kernel.org,
        Stephen Boyd <sboyd@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Sean Paul <seanpaul@...omium.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        freedreno <freedreno@...ts.freedesktop.org>
Subject: Re: [PATCH AUTOSEL 5.2 42/76] drm/msm: stop abusing dma_map/unmap
 for cache

On Fri, Aug 02, 2019 at 05:14:35PM -0700, Rob Clark wrote:
>Hi Sasha,
>
>It's probably best *not* to backport this patch.. drm/msm abuses the
>DMA API in a way that it is not intended be used, to work around the
>lack of cache sync API exported to kernel modules on arm/arm64.  I
>couldn't really guarantee that this patch does the right thing on
>older versions of DMA API, so best to leave things as they were.

Now dropped, thank you.

--
Thanks,
Sasha