linux-kernel - Re: [RFC/RFT PATCH 2/6] x86/mm/fixmap: Add GHES fixmap entries

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Date:   Tue, 31 Oct 2017 20:09:47 +0100
From:   Borislav Petkov <bp@...e.de>
To:     James Morse <james.morse@....com>
Cc:     linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, x86@...nel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, Tony Luck <tony.luck@...el.com>,
        Tyler Baicar <tbaicar@...eaurora.org>,
        Dongjiu Geng <gengdongjiu@...wei.com>,
        Xie XiuQi <xiexiuqi@...wei.com>, torvalds@...ux-foundation.org
Subject: Re: [RFC/RFT PATCH 2/6] x86/mm/fixmap: Add GHES fixmap entries

On Tue, Oct 31, 2017 at 03:38:28PM +0000, James Morse wrote:
> GHES is switching to use fixmap for its dynamic mapping of CPER records,
> to avoid using ioremap_page_range() in IRQ/NMI context.
> 
> Signed-off-by: James Morse <james.morse@....com>
> ---
>  arch/x86/include/asm/fixmap.h | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/x86/include/asm/fixmap.h b/arch/x86/include/asm/fixmap.h
> index dcd9fb55e679..be3cc32db7f0 100644
> --- a/arch/x86/include/asm/fixmap.h
> +++ b/arch/x86/include/asm/fixmap.h
> @@ -104,6 +104,10 @@ enum fixed_addresses {
>  	FIX_GDT_REMAP_BEGIN,
>  	FIX_GDT_REMAP_END = FIX_GDT_REMAP_BEGIN + NR_CPUS - 1,
>  
> +	/* Used for GHES mapping from assorted contexts */
> +	FIX_APEI_GHES_IRQ,
> +	FIX_APEI_GHES_NMI,

Maybe I'm missing something but shouldn't those two be inside
CONFIG_ACPI_APEI_GHES ifdeffery?

Ditto for the ARM side.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--