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SubjectRe: [PATCH 0/2] arm64: support initrd outside of mapped RAM
Hi Mark,

As a heads-up, it looks like you missed a space when sending this; Arnd
and Ard got merged into:

"Arnd Bergmann <arnd@arndb.de>--cc=Ard Biesheuvel" <ard.biesheuvel@linaro.org>

I've corrected that for this reply.

On Tue, Jul 28, 2015 at 03:32:39PM +0100, Mark Salter wrote:
> When booting an arm64 kernel w/initrd using UEFI/grub, use of mem= will likely
> cut off part or all of the initrd. This leaves it outside the kernel linear
> map which leads to failure when unpacking. The x86 code has a similar need to
> relocate an initrd outside of mapped memory in some cases.
>
> The current x86 code uses early_memremap() to copy the original initrd from
> unmapped to mapped RAM. This patchset creates a generic copy_from_early_mem()
> utility based on that x86 code and has arm64 use it to relocate the initrd
> if necessary.

This sounds like a sane idea to me.

> Mark Salter (2):
> mm: add utility for early copy from unmapped ram
> arm64: support initrd outside kernel linear map
>
> arch/arm64/kernel/setup.c | 55 +++++++++++++++++++++++++++++++++++++
> include/asm-generic/early_ioremap.h | 6 ++++
> mm/early_ioremap.c | 22 +++++++++++++++
> 3 files changed, 83 insertions(+)

Any reason for not moving x86 over to the new generic version?

Mark.


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