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    efi: Clean up the efi_call_phys_[prolog|epilog]() save/restore interaction · 744937b0
    Ingo Molnar 提交于
    Currently x86-64 efi_call_phys_prolog() saves into a global variable (save_pgd),
    and efi_call_phys_epilog() restores the kernel pagetables from that global
    variable.
    
    Change this to a cleaner save/restore pattern where the saving function returns
    the saved object and the restore function restores that.
    
    Apply the same concept to the 32-bit code as well.
    
    Plus this approach, as an added bonus, allows us to express the
    !efi_enabled(EFI_OLD_MEMMAP) situation in a clean fashion as well,
    via a 'NULL' return value.
    
    Cc: Tapasweni Pathak <tapaswenipathak@gmail.com>
    Signed-off-by: NIngo Molnar <mingo@kernel.org>
    Signed-off-by: NMatt Fleming <matt.fleming@intel.com>
    744937b0
efi.h 5.4 KB