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    SubjectRe: [PATCH] x86: fix Intel Mac booting with EFI

    * Hugh Dickins <> wrote:

    > Fedora reports that mem_init()'s zap_low_mappings(), extended to SMP
    > in 61165d7a035f6571c7576e7f51e7230157724c8d x86: fix app crashes after
    > SMP resume causes 32-bit Intel Mac machines to reboot very early when
    > booting with EFI.
    > The EFI code appears to manage low mappings for itself when needed;
    > but like many before it, confuses PSE with PAE. So it has only been
    > mapping half the space it needed when PSE but not PAE. This remained
    > unnoticed until we moved the SMP zap_low_mappings() before
    > efi_enter_virtual_mode(). Presumably could have been noticed years
    > ago if anyone ran a UP kernel on such machines?

    good spotting!

    Acked-by: Ingo Molnar <>


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