linux-kernel - RE: [ v4] powerpc: Force page alignment for initrd reserved memory

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Message-ID: <initrd-align-withdrawn@mdm.bga.com>
Date:	Mon, 23 May 2011 12:39:06 -0500
From:	Milton Miller <miltonm@....com>
To:	Dave Carroll <dcarroll@...ekcorp.com>
CC:	LPPC <linuxppc-dev@...ts.ozlabs.org>,
	Paul Mackerras <paulus@...ba.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Benjamin Herrenschmidt" <benh@...nel.crashing.org>
Subject: RE: [ v4] powerpc: Force page alignment for initrd reserved memory


On Mon, 23 May 2011 about 10:50:07 -0600, Dave Carroll wrote:
> I'm withdrawing this patch for the moment, due to two areas that need
> further research;
> 
> 1) An adjacent FDT blob, as mentioned by Milton Miller, and
> 

Ok ... by the way, see move_device_tree() in arch/powerpc/kernel/prom.c

> 2) Potential interaction with the crash kernel, as used in
>         init/initramfs.c

which already goes around the start and end of crashk_res, which
is adjusted to PAGE_ALIGN in reserve_crashkernel() in machine_kexec.c

 
> If anyone sees other interactions, please feel free to let me know ...
> 
> Thanks,
> -Dave Carroll

One interaction that I have ignored is preserve_initrd overlapping
crash kernel.  Loading the crash kernel destroys the preserved initrd.
But that is beyond the scope of your current patch (and probably a
seperate patch, with cross-architecture scope).

milton
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