From mboxrd@z Thu Jan  1 00:00:00 1970
From: Maniaxx <tripleshiftone-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: PROBLEM: Kernel panic on EFI BGRT early init code (kernel
 4.11/4.12rc2) [regression]
Date: Thu, 1 Jun 2017 21:13:20 +0200
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On 01.06.2017 at 03:57 wrote Dave Young:
> This means the efi_bgrt_init failed out originally before the early init BGRT
> patch. Checking the code the only difference is current code we have no
> below code:
> 
>         status = acpi_get_table("BGRT", 0,
>                                 (struct acpi_table_header **)&bgrt_tab);
>         if (ACPI_FAILURE(status))
>                 return;
> 
> So probably acpi_get_table has some more sanity checking and it failed
> early. Can you add a printk before above return to confirm it? Just test
> the old kernel without early init BGRT patch.

Doesn't fail early. I can see the printk.