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[217.140.101.70]) by mx.google.com with ESMTP id q19si1645124edd.425.2019.05.31.09.22.15 for ; Fri, 31 May 2019 09:22:15 -0700 (PDT) Received-SPF: pass (google.com: domain of catalin.marinas@arm.com designates 217.140.101.70 as permitted sender) client-ip=217.140.101.70; Authentication-Results: mx.google.com; spf=pass (google.com: domain of catalin.marinas@arm.com designates 217.140.101.70 as permitted sender) smtp.mailfrom=catalin.marinas@arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 72A16341; Fri, 31 May 2019 09:22:14 -0700 (PDT) Received: from arrakis.emea.arm.com (arrakis.cambridge.arm.com [10.1.196.78]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D9D693F59C; Fri, 31 May 2019 09:22:08 -0700 (PDT) Date: Fri, 31 May 2019 17:22:06 +0100 From: Catalin Marinas To: Andrey Konovalov Cc: Vincenzo Frascino , Linux ARM , Linux Memory Management List , LKML , 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" , Will Deacon , Mark Rutland , Andrew Morton , Greg Kroah-Hartman , Kees Cook , Yishai Hadas , Felix Kuehling , Alexander Deucher , Christian Koenig , Mauro Carvalho Chehab , Jens Wiklander , Alex Williamson , Leon Romanovsky , Dmitry Vyukov , Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Robin Murphy , Luc Van Oostenryck , Dave Martin , Kevin Brodsky , Szabolcs Nagy 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: <20190522141612.GA28122@arrakis.emea.arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, May 31, 2019 at 04:21:48PM +0200, Andrey Konovalov wrote: > On Wed, May 22, 2019 at 4:16 PM Catalin Marinas 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