linux-kernel - Re: [PATCH] x86: update vmlinux.lds.S to place .data section on a page boundary

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Date:	Thu, 28 Sep 2006 22:42:20 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Neil Horman <nhorman@...driver.com>
Cc:	linux-kernel@...r.kernel.org, mj@...ey.karlin.mff.cuni.cz,
	davej@...hat.com
Subject: Re: [PATCH] x86: update vmlinux.lds.S to place .data section on a page boundary

On Thu, Sep 28, 2006 at 04:12:49PM -0400, Neil Horman wrote:
> Patch to update vmlinux linker script so that .data section is on a page
> boundary.  without this change the kernel's .data section is on a non-4k
> boundary, and this prevents kexec from loading a new kernel.  Tested
> successfully by me.
NAK

> +  . = ALIGN(4096);

Do not use magic numbers like this.
Please replace 4096 with PAGE_SIZE - page.h is already included so it is
available.
This servers two purposes:
1) This make it more self documenting
2) It makes it more portable should we decide to do this in a general
way for all arch's.

And then maybe a comment why it is desireable to waste a lot of RAM
in some cases. For the embedded people wasting up to 4088 bytes
of RAM is not desireable.

	Sam
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