Re: [PATCH 2/2] arm: apply more __ro_after_init
From: Russell King - ARM Linux <linux@armlinux.org.uk>
Date: 2016-08-10 23:02:53
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On Wed, Aug 10, 2016 at 09:31:05PM +0200, Arnd Bergmann wrote:
On Wednesday, August 10, 2016 11:12:53 AM CEST Russell King - ARM Linux wrote:quoted
There's the TLS emulation too, but that writes via the vectors mapping at 0xffff0ff0.Ok, so that should be safe. Can we change the fiq code to also use the high mapping and then take the __ro_after_init patch on top?
We can't - if the kernel is configured without the kuser helpers in the vectors page, it's mapped read-only. I'm not sure what the intersection is between platforms that can have FIQs and platforms that can disable the kuser helpers. -- RMK's Patch system: http://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up according to speedtest.net.