linux-kernel - Re: [PATCH 5/6] ARM: ux500: Enable HIGHMEM on all mop500 platforms

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Date:	Tue, 31 Jul 2012 20:50:02 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	"Russell King - ARM Linux" <linux@....linux.org.uk>
Cc:	Lee Jones <lee.jones@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	ola.o.lilja@...ricsson.com, alsa-devel@...a-project.org,
	linus.walleij@...ricsson.com, broonie@...nsource.wolfsonmicro.com,
	olalilja@...oo.se, STEricsson_nomadik_linux@...t.st.com, lrg@...com
Subject: Re: [PATCH 5/6] ARM: ux500: Enable HIGHMEM on all mop500 platforms

On Tuesday 31 July 2012, Russell King - ARM Linux wrote:
> I still fail to see how not having highmem enabled would ever cause memory
> corruption errors (unless something dealing with memory in a very very
> wrong way - iow, not using one of the reservation or memory allocation
> methods provided by the kernel.)

The problem is that all users of ux500 systems pass a command line like

vmalloc=256M mem=128M@0 mali.mali_mem=32M@...M hwmem=168M@...M mem=48M@...M mem_issw=1M@...M mem=640M@...M

This is of course totally bogus and should not be done. If I understand
Lee correctly, one of the issues resulting from passing a command
line like this without enabling highmem is memory corruption.

"Doctor it hurts when I do this ..."

	Arnd
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