[PATCH V3 0/3] mm: Add generic copy from early unmapped RAM
From: Mark Salter
Date: Sun Aug 16 2015 - 16:50:01 EST
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 and x86 share it in their
respective initrd relocation code.
Changes from V2:
* Fixed sparse warning in copy_from_early_mem()
* Removed unneeded MAX_MAP_CHUNK from x86 setup.c
* Moved #ifdef outside arm64 relocate_initrd() definition.
Changes from V1:
* Change cover letter subject to highlight the added generic code
* Add patch for x86 to use common copy_from_early_mem()
Mark Salter (3):
mm: add utility for early copy from unmapped ram
arm64: support initrd outside kernel linear map
x86: use generic early mem copy
arch/arm64/kernel/setup.c | 59 +++++++++++++++++++++++++++++++++++++
arch/x86/kernel/setup.c | 22 +-------------
include/asm-generic/early_ioremap.h | 6 ++++
mm/early_ioremap.c | 22 ++++++++++++++
4 files changed, 88 insertions(+), 21 deletions(-)
--
2.4.3
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