linux-kernel - Re: [PATCH 4/4] efi/x86: add debug code to print cooked memmap

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Message-ID: <CAKv+Gu-cM4nBk8hFT8asYy7Q1g+woHLF24y+djYwVUY=1xV5gQ@mail.gmail.com>
Date:   Thu, 12 Jan 2017 16:18:21 +0000
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     Dave Young <dyoung@...hat.com>
Cc:     Matt Fleming <matt@...eblueprint.co.uk>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        Nicolai Stange <nicstange@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "hpa@...or.com" <hpa@...or.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Mika Penttilä <mika.penttila@...tfour.com>,
        bhsharma@...hat.com
Subject: Re: [PATCH 4/4] efi/x86: add debug code to print cooked memmap

On 12 January 2017 at 09:41, Dave Young <dyoung@...hat.com> wrote:
> It is not obvious if the reserved boot area are added correctly, add a
> efi_print_memmap to print the new memmap.
>
> Signed-off-by: Dave Young <dyoung@...hat.com>

This sounds useful regardless of the other patches in this series:

Acked-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>

Note that it is appropriate to keep this x86 specific, since we never
modify the memory map on ARM (except for the sorting that occurs in
the stub)

> ---
>  arch/x86/platform/efi/efi.c |    5 +++++
>  1 file changed, 5 insertions(+)
>
> --- linux-x86.orig/arch/x86/platform/efi/efi.c
> +++ linux-x86/arch/x86/platform/efi/efi.c
> @@ -873,6 +873,11 @@ static void __init __efi_enter_virtual_m
>                 return;
>         }
>
> +       if (efi_enabled(EFI_DBG)) {
> +               pr_info("EFI runtime memory map:\n");
> +               efi_print_memmap();
> +       }
> +
>         BUG_ON(!efi.systab);
>
>         if (efi_setup_page_tables(pa, 1 << pg_shift)) {
>
>