• Ard Biesheuvel's avatar
    efi/arm: Revert deferred unmap of early memmap mapping · 33412b86
    Ard Biesheuvel authored
    Commit:
    
      3ea86495 ("efi/arm: preserve early mapping of UEFI memory map longer for BGRT")
    
    deferred the unmap of the early mapping of the UEFI memory map to
    accommodate the ACPI BGRT code, which looks up the memory type that
    backs the BGRT table to validate it against the requirements of the UEFI spec.
    
    Unfortunately, this causes problems on ARM, which does not permit
    early mappings to persist after paging_init() is called, resulting
    in a WARN() splat. Since we don't support the BGRT table on ARM anway,
    let's revert ARM to the old behaviour, which is to take down the
    early mapping at the end of efi_init().
    Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: linux-efi@vger.kernel.org
    Fixes: 3ea86495 ("efi/arm: preserve early mapping of UEFI memory ...")
    Link: http://lkml.kernel.org/r/20181114175544.12860-3-ard.biesheuvel@linaro.orgSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
    33412b86
memmap.c 8.85 KB