Messages in this thread | | | From | Mark Salter <> | Subject | [PATCH V4 0/3] mm: Add generic copy from early unmapped RAM | Date | Mon, 17 Aug 2015 13:01:04 -0400 |
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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 V3:
* Fixed arm64 build error with !CONFIG_BLK_DEV_INITRD case
* Fixed nonsensical comment in arm64 relocate_initrd()
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 | 62 +++++++++++++++++++++++++++++++++++++ arch/x86/kernel/setup.c | 22 +------------ include/asm-generic/early_ioremap.h | 6 ++++ mm/early_ioremap.c | 22 +++++++++++++ 4 files changed, 91 insertions(+), 21 deletions(-)
-- 2.4.3
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