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[217.229.16.64]) by smtp.gmail.com with ESMTPSA id e53sm4000074ede.90.2018.12.11.02.27.10 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 11 Dec 2018 02:27:11 -0800 (PST) Date: Tue, 11 Dec 2018 11:27:10 +0100 From: Thierry Reding To: Arnd Bergmann Cc: Mikko Perttunen , Dmitry Osipenko , emil.fsw@goode.io, dri-devel , "open list:TEGRA ARCHITECTURE SUPPORT" , Linux Kernel Mailing List Subject: Re: [PATCH] host1x: cdma: use completion instead of semaphore Message-ID: <20181211102710.GH14426@ulmo> References: <20181210215119.1903413-1-arnd@arndb.de> <20181211100832.GE14426@ulmo> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="wayzTnRSUXKNfBqd" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --wayzTnRSUXKNfBqd Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Dec 11, 2018 at 11:11:38AM +0100, Arnd Bergmann wrote: > On Tue, Dec 11, 2018 at 11:08 AM Thierry Reding > wrote: > > > > 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 > > > --- > > > 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? >=20 > Yes, it behaves the exact same way here. Great, I'll queue this for v4.22. Thanks, Thierry --wayzTnRSUXKNfBqd Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEiOrDCAFJzPfAjcif3SOs138+s6EFAlwPkP4ACgkQ3SOs138+ s6HIbA/+JFwP435Ilng50f4ZLkabfeZnPpo3KewBVB3x9kqif203Z/fvqNPtnW61 bHltheckdQUJitANGYP2sehBL+bfld6jkFrguQVjLkinZ6LIAeNszxaQGS5RQxny a8L4IE/TGkpWmVhMFvfE2emcaGXBD5XwyU9eSYKnH+wMKAVqzpNIQW+I0vKVPLF6 60dPm/KJBZtDXrorAlv8NuZjcYZA66NQIjUS2aLw4zykjFiNdI8gc3DHzTrBYGHF OI//UPtbD1Z34jJ+yrMKXC1BMj8TI5jW6Ze6f6Go2t8GJpsELs9L897ti8/8AuDp AY3NJ2pNoLtJaurxomJJqXILDCj/uHNQ6dcKMtNxQTEbWjYVslAeo9sp9LSkGHLW fy/Oo6GiTw7dlQQ581Efao1L7zADnMxsOjsPN0QIAoFYTWrgyM5MaaVvqSO4ckxk cMpe2lLnB8Q0N8XuLVue7fwe9a634mqYgfwRsx3WE/SSkAO8GuHFtJlGquv/MDm7 q+a/Wlf8Si6j0N/S2psz9e5DAIbjTv3VyGxeEbAV/rR7OHOYTvdOwZI5Z+XWXuxs 8aQbo9ct8LhlCDB0SpRAc69p+CbdEzPJYw0m2Tce/qLDxY7+G0mb5nYQthARBHF4 JSY7iOpNm03GOC2/AiBxBJzndN5dTOC58cwDlRSRkfgopB2UCcg= =f3WX -----END PGP SIGNATURE----- --wayzTnRSUXKNfBqd--