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由 Matt Fleming 提交于
Maarten reported that his Macbook pro 8.2 stopped booting after commit f23cf8bd ("efi/x86: efistub: Move shared dependencies to <asm/efi.h>"), the main feature of which is changing the visibility of symbol 'efi_early' from local to global. By making 'efi_early' global we end up requiring an entry in the Global Offset Table. Unfortunately, while we do include code to fixup GOT entries in the early boot code, it's only called after we've executed the EFI boot stub. What this amounts to is that references to 'efi_early' in the EFI boot stub don't point to the correct place. Since we've got multiple boot entry points we need to be prepared to fixup the GOT in multiple places, while ensuring that we never do it more than once, otherwise the GOT entries will still point to the wrong place. Reported-by: NMaarten Lankhorst <maarten.lankhorst@canonical.com> Tested-by: NMaarten Lankhorst <maarten.lankhorst@canonical.com> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: NMatt Fleming <matt.fleming@intel.com>
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