linux-kernel - Re: [4.4] broken conversion from efi to kernel page table

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Date:   Fri, 12 Jan 2018 11:04:57 +0100 (CET)
From:   Jiri Kosina <jikos@...nel.org>
To:     Pavel Tatashin <pasha.tatashin@...cle.com>
cc:     steven.sistare@...cle.com, linux-kernel@...r.kernel.org,
        tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        x86@...nel.org, gregkh@...uxfoundation.org, hughd@...gle.com,
        dave.hansen@...ux.intel.com, luto@...nel.org,
        torvalds@...ux-foundation.org
Subject: Re: [4.4] broken conversion from efi to kernel page table

On Thu, 11 Jan 2018, Pavel Tatashin wrote:

> This fixes boot panics, hangs which I reported in this thread:

Are you using EFI old_memmap?

If so, then

	https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=x86/pti&id=de53c3786a3ce162a1c815d0c04c766c23ec9c0a

("x86/pti: Unbreak EFI old_memmap") should be the cure.

If not, you might be missing this in in arch/x86/platform/efi/efi_64.c

-      efi_pgd = (pgd_t *)__get_free_page(gfp_mask);
+      efi_pgd = (pgd_t *)__get_free_pages(gfp_mask, PGD_ALLOCATION_ORDER);

Could you please let me know if either of this fixes your problem?

Thanks,

-- 
Jiri Kosina
SUSE Labs