linux-kernel - Re: [PATCH] host1x: cdma: use completion instead of semaphore

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Message-ID: <20181211100832.GE14426@ulmo>
Date:   Tue, 11 Dec 2018 11:08:32 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Mikko Perttunen <cyndis@...si.fi>,
        Dmitry Osipenko <digetx@...il.com>,
        Emil Goode <emil.fsw@...de.io>,
        dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] host1x: cdma: use completion instead of semaphore

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.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.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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