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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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