Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Fri, 31 May 2019 17:22:06 +0100
From:   Catalin Marinas <catalin.marinas@arm.com>
To:     Andrey Konovalov <andreyknvl@google.com>
Cc:     Vincenzo Frascino <vincenzo.frascino@arm.com>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        Linux Memory Management List <linux-mm@kvack.org>,
        LKML <linux-kernel@vger.kernel.org>,
        amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
        linux-rdma@vger.kernel.org, linux-media@vger.kernel.org,
        kvm@vger.kernel.org,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@vger.kernel.org>,
        Will Deacon <will.deacon@arm.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Kees Cook <keescook@chromium.org>,
        Yishai Hadas <yishaih@mellanox.com>,
        Felix Kuehling <Felix.Kuehling@amd.com>,
        Alexander Deucher <Alexander.Deucher@amd.com>,
        Christian Koenig <Christian.Koenig@amd.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Jens Wiklander <jens.wiklander@linaro.org>,
        Alex Williamson <alex.williamson@redhat.com>,
        Leon Romanovsky <leon@kernel.org>,
        Dmitry Vyukov <dvyukov@google.com>,
        Kostya Serebryany <kcc@google.com>,
        Evgeniy Stepanov <eugenis@google.com>,
        Lee Smith <Lee.Smith@arm.com>,
        Ramana Radhakrishnan <Ramana.Radhakrishnan@arm.com>,
        Jacob Bramley <Jacob.Bramley@arm.com>,
        Ruben Ayrapetyan <Ruben.Ayrapetyan@arm.com>,
        Robin Murphy <robin.murphy@arm.com>,
        Luc Van Oostenryck <luc.vanoostenryck@gmail.com>,
        Dave Martin <Dave.Martin@arm.com>,
        Kevin Brodsky <kevin.brodsky@arm.com>,
        Szabolcs Nagy <Szabolcs.Nagy@arm.com>
Subject: Re: [PATCH v15 17/17] selftests, arm64: add a selftest for passing
 tagged pointers to kernel
Message-ID: <20190531162206.GB3568@arrakis.emea.arm.com>
References: <cover.1557160186.git.andreyknvl@google.com>
 <e31d9364eb0c2eba8ce246a558422e811d82d21b.1557160186.git.andreyknvl@google.com>
 <20190522141612.GA28122@arrakis.emea.arm.com>
 <CAAeHK+wUerHQOV2PuaTwTxcCucZHZodLwg48228SB+ymxEqT2A@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CAAeHK+wUerHQOV2PuaTwTxcCucZHZodLwg48228SB+ymxEqT2A@mail.gmail.com>
User-Agent: Mutt/1.10.1 (2018-07-13)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Fri, May 31, 2019 at 04:21:48PM +0200, Andrey Konovalov wrote:
> On Wed, May 22, 2019 at 4:16 PM Catalin Marinas <catalin.marinas@arm.com> wrote:
> > On Mon, May 06, 2019 at 06:31:03PM +0200, Andrey Konovalov wrote:
> > > This patch is a part of a series that extends arm64 kernel ABI to allow to
> > > pass tagged user pointers (with the top byte set to something else other
> > > than 0x00) as syscall arguments.
> > >
> > > This patch adds a simple test, that calls the uname syscall with a
> > > tagged user pointer as an argument. Without the kernel accepting tagged
> > > user pointers the test fails with EFAULT.
> >
> > That's probably sufficient for a simple example. Something we could add
> > to Documentation maybe is a small library that can be LD_PRELOAD'ed so
> > that you can run a lot more tests like LTP.
> 
> Should I add this into this series, or should this go into Vincenzo's patchset?

If you can tweak the selftest Makefile to build a library and force it
with LD_PRELOAD, you can keep it with this patch. It would be easier to
extend to other syscall tests, signal handling etc.

-- 
Catalin