linux-kernel - Re: [PATCH v5 13/32] x86/boot/e820: Add support to determine the E820 type of an address

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Date:   Fri, 5 May 2017 19:11:55 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Tom Lendacky <thomas.lendacky@....com>
Cc:     linux-arch@...r.kernel.org, linux-efi@...r.kernel.org,
        kvm@...r.kernel.org, linux-doc@...r.kernel.org, x86@...nel.org,
        kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com, linux-mm@...ck.org,
        iommu@...ts.linux-foundation.org, Rik van Riel <riel@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Toshimitsu Kani <toshi.kani@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Jonathan Corbet <corbet@....net>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Joerg Roedel <joro@...tes.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Larry Woodman <lwoodman@...hat.com>,
        Brijesh Singh <brijesh.singh@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dave Young <dyoung@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH v5 13/32] x86/boot/e820: Add support to determine the
 E820 type of an address

On Tue, Apr 18, 2017 at 04:18:31PM -0500, Tom Lendacky wrote:
> Add a function that will return the E820 type associated with an address
> range.

...

> @@ -110,9 +111,28 @@ bool __init e820__mapped_all(u64 start, u64 end, enum e820_type type)
>  		 * coverage of the desired range exists:
>  		 */
>  		if (start >= end)
> -			return 1;
> +			return entry;
>  	}
> -	return 0;
> +
> +	return NULL;
> +}
> +
> +/*
> + * This function checks if the entire range <start,end> is mapped with type.
> + */
> +bool __init e820__mapped_all(u64 start, u64 end, enum e820_type type)
> +{
> +	return __e820__mapped_all(start, end, type) ? 1 : 0;

	return !!__e820__mapped_all(start, end, type);

-- 
Regards/Gruss,
    Boris.

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