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Wed, 04 Dec 2019 08:16:43 -0800 (PST) Date: Wed, 4 Dec 2019 08:16:41 -0800 From: Guenter Roeck To: Vincenzo Frascino Cc: linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-kselftest@vger.kernel.org, Catalin Marinas , Will Deacon , Arnd Bergmann , Russell King , Ralf Baechle , Paul Burton , Daniel Lezcano , Thomas Gleixner , Mark Salyzyn , Peter Collingbourne , Shuah Khan , Dmitry Safonov <0x7f454c46@gmail.com>, Rasmus Villemoes , Huw Davies , Shijith Thotton , Andre Przywara Subject: Re: [PATCH v7 16/25] arm: Add support for generic vDSO (causing crash) Message-ID: <20191204161641.GA28130@roeck-us.net> References: <20190621095252.32307-1-vincenzo.frascino@arm.com> <20190621095252.32307-17-vincenzo.frascino@arm.com> <20191204135159.GA7210@roeck-us.net> <6cdf4734-4065-09c1-8623-1bf523b38c1b@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <6cdf4734-4065-09c1-8623-1bf523b38c1b@arm.com> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Dec 04, 2019 at 01:58:25PM +0000, Vincenzo Frascino wrote: > Hi Guenter, > > On 12/4/19 1:51 PM, Guenter Roeck wrote: > > On Fri, Jun 21, 2019 at 10:52:43AM +0100, Vincenzo Frascino wrote: > >> The arm vDSO library requires some adaptations to use to take advantage > >> of the newly introduced generic vDSO library. > >> > >> Introduce the following changes: > >> - Modification vdso.c to be compliant with the common vdso datapage > >> - Use of lib/vdso for gettimeofday > >> - Implementation of elf note > >> > >> Cc: Russell King > >> Signed-off-by: Vincenzo Frascino > > > > This patch causes a crash with qemu's mcimx6ul-evk emulation while running > > imx_v6_v7_defconfig. > > > > Thank you for reporting this. Could you please provide some details on how I can > reproduce the scenario you are describing? > - Build imx_v6_v7_defconfig - Get root file system or initrd, for example from https://github.com/groeck/linux-build-test/tree/master/rootfs/arm - Run image. Example, with initrd: qemu-system-arm -M mcimx6ul-evk -kernel arch/arm/boot/zImage \ -no-reboot -initrd rootfs-armv7a.cpio \ -m 256 -display none -serial null \ --append 'rdinit=/sbin/init earlycon=ec_imx6q,mmio,0x21e8000,115200n8 console=ttymxc1,115200' -dtb arch/arm/boot/dts/imx6ul-14x14-evk.dtb \ -nographic -monitor null -serial stdio qemu has to be v3.1 or later to support the machine. Hope this helps, Guenter