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

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Date:	Fri, 31 May 2013 17:02:53 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Lee Jones <lee.jones@...aro.org>
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 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.

> 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.

	ARnd
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