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Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:44540) by pandora.armlinux.org.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jjf9b-0002OC-MK; Fri, 12 Jun 2020 09:35:11 +0100 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1jjf9a-00066D-TL; Fri, 12 Jun 2020 09:35:10 +0100 Date: Fri, 12 Jun 2020 09:35:10 +0100 From: Russell King - ARM Linux admin To: Arnd Bergmann Subject: Re: [PATCH v2 1/6] ARM: Use PAGE_SIZE for ELF_EXEC_PAGESIZE Message-ID: <20200612083510.GB1551@shell.armlinux.org.uk> References: <20200611134914.765827-1-gregory.clement@bootlin.com> <20200611134914.765827-2-gregory.clement@bootlin.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200612_013517_689496_4502F7A8 X-CRM114-Status: GOOD ( 13.02 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Gregory CLEMENT , Thomas Petazzoni , Linux ARM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Jun 12, 2020 at 10:22:17AM +0200, Arnd Bergmann wrote: > On Thu, Jun 11, 2020 at 3:49 PM Gregory CLEMENT > wrote: > > > > Currently ELF_EXEC_PAGESIZE is 4096 which is also the page size. In > > order to be able to use other size of page than 4K, use PAGE_SIZE > > instead of the hardcoded value. > > > > The use of PAGE_SIZE will be also aligned with what we find in other > > architectures such as arm64. > > > > This is inspired from fa0ca2726ea9 ("DSMP 64K support") and > > 4ef803e12baf ("mmu: large-page: Added support for multiple kernel page > > sizes") from > > https://github.com/MarvellEmbeddedProcessors/linux-marvell.git > > > > Signed-off-by: Gregory CLEMENT > > IIRC using page sizes above 16KB here also requires using a > non-ancient linker in user space that places sections on > ELF_EXEC_PAGESIZE boundaries, right? Doesn't that mean that this change breaks all existing userspace when ELF_EXEC_PAGESIZE is not 4k? -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last! _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel