Re: [RFC PATCH 0/4] EFI boot stub memory map fix

["H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>]

I would strongly disagree that option 2 is the cleaner solution.

Linn Crosetto <linn-VXdhtT5mjnY@public.gmane.org> wrote:
>I realize the EFI stub for ARM patches are in flight, 
>
>https://lkml.org/lkml/2013/8/9/554
>
>and overlap with some of the files but I wanted to send these out for
>comment.
>
>This series fixes a problem with EFI memory maps larger than 128
>entries when
>booting using the EFI boot stub, which results in overflowing the
>e820_map in
>boot_params and an eventual halt when checking the map size in
>sanitize_e820_map().
>
>The fix implemented is to add the EFI memory map from setup_arch() via
>a
>memory_setup hook.
>
>Two options were considered:
>
> 1. Use the SETUP_E820_EXT setup_data type to add the extra entries.
>
>2. Create a memory_setup function to be enabled when the EFI memory map
>is
>    needed.
>
>Option 2 appeared to be the cleaner solution, reducing duplication with
>existing code, given a reasonable mechanism for determining when to
>replace the default memory_setup function.
>
>
>Linn Crosetto (4):
>  efi: Decouple efi_memmap_init() and do_add_efi_memmap()
>  efi: Add memory_setup function efi_memory_setup()
>  efi: Add efi_memmap_needed()
>  x86: Fix EFI boot stub for large memory maps
>
>arch/x86/boot/compressed/eboot.c | 64
>++--------------------------------------
> arch/x86/kernel/setup.c          |  3 ++
> arch/x86/platform/efi/efi.c      | 51 +++++++++++++++++++++++---------
> include/linux/efi.h              |  2 ++
> 4 files changed, 45 insertions(+), 75 deletions(-)

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