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Message-ID: <20151106204641.GT8644@n2100.arm.linux.org.uk> Date: Fri, 6 Nov 2015 20:46:41 +0000 From: Russell King - ARM Linux <linux@....linux.org.uk> To: Laura Abbott <labbott@...hat.com> Cc: Kees Cook <keescook@...omium.org>, Laura Abbott <labbott@...oraproject.org>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will.deacon@....com>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, LKML <linux-kernel@...r.kernel.org>, Linux-MM <linux-mm@...ck.org> Subject: Re: [PATCH] arm: Use kernel mm when updating section permissions On Fri, Nov 06, 2015 at 10:44:32AM -0800, Laura Abbott wrote: > with my test patch. I think setting both current->active_mm and &init_mm > is sufficient. Maybe explicitly setting swapper_pg_dir would be cleaner? Please, stop thinking like this. If you're trying to change the kernel section mappings after threads have been spawned, you need to change them for _all_ threads, which means you need to change them for every page table that's in existence at that time - you can't do just one table and hope everyone updates, it doesn't work like that. -- FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up according to speedtest.net. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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