From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thierry Reding <thierry.reding@gmail.com>
Subject: Re: [PATCH] host1x: cdma: use completion instead of semaphore
Date: Tue, 11 Dec 2018 11:08:32 +0100
Message-ID: <20181211100832.GE14426@ulmo>
References: <20181210215119.1903413-1-arnd@arndb.de>
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Sender: linux-kernel-owner@vger.kernel.org
To: Arnd Bergmann <arnd@arndb.de>
Cc: Mikko Perttunen <cyndis@kapsi.fi>, Dmitry Osipenko <digetx@gmail.com>, Emil Goode <emil.fsw@goode.io>, dri-devel@lists.freedesktop.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org
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On Mon, Dec 10, 2018 at 10:51:04PM +0100, Arnd Bergmann wrote:
> In this usage, the two are completely equivalent, but the
> completion documents better what is going on, and we generally
> try to avoid semaphores these days.
>=20
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  drivers/gpu/host1x/cdma.c | 6 +++---
>  drivers/gpu/host1x/cdma.h | 4 ++--
>  2 files changed, 5 insertions(+), 5 deletions(-)

My understanding is that potentially many userspace processes could be
blocking on this, which I think is the reason for it being a semaphore.
Is the completion going to work for those cases as well?

Thierry

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