linux-kernel - Re: [PATCH 2/2] ARM: ux500: Enable HIGHMEM in the u8540 defconfig

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Message-ID: <20130531151850.GC12488@gmail.com>
Date:	Fri, 31 May 2013 16:18:50 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linus.walleij@...ricsson.com, srinidhi.kasagar@...ricsson.com
Subject: Re: [PATCH 2/2] ARM: ux500: Enable HIGHMEM in the u8540 defconfig

On Fri, 31 May 2013, Arnd Bergmann wrote:

> On Friday 31 May 2013 15:24:32 Lee Jones wrote:
> > In order to utilise all of the memory located on ux500 based devices
> > we have to enable HIGHMEM. Without it the kernel truncates memory down
> > to what's left after the PAGE_OFFSET has been applied, which doesn't
> > leave an awful lot, especially if we're running large rootfs' such
> > as full Linux desktop distributions or Android.
> > 
> > Signed-off-by: Lee Jones <lee.jones@...aro.org>
> 
> How much memory do those devices have? Enabling HIGHMEM is quite expensive.

Another 1GB.

> > diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> > index 5439925..808be06 100644
> > --- a/drivers/of/fdt.c
> > +++ b/drivers/of/fdt.c
> 
> You should probably resend the patch without the second half that got
> in it by accident.

I did already, thanks.

-- 
Lee Jones
Linaro ST-Ericsson Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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