linux-kernel - Re: [PATCH] x86 efi: efi reverve boot service fix

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Date:	Wed, 16 Oct 2013 15:11:22 +0800
From:	Dave Young <dyoung@...hat.com>
To:	matt@...sole-pimps.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, mjg59@...f.ucam.org, hpa@...or.com,
	James.Bottomley@...senPartnership.com, vgoyal@...hat.com,
	linux-efi@...r.kernel.org
Subject: Re: [PATCH] x86 efi: efi reverve boot service fix

typo, fix hpa's mail address..

On 10/16/13 at 03:03pm, Dave Young wrote:
> 
> Current code check boot service region with kernel text region by: 
> start+size >= __pa_symbol(_text)
> The end of the above region should be start + size - 1 instead.
> 
> I see this problem in ovmf + Fedora 19 grub boot:
> text start: 1000000 md start: 800000 md size: 800000
> 
> Signed-off-by: Dave Young <dyoung@...hat.com>
> ---
>  arch/x86/platform/efi/efi.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- linux-2.6.orig/arch/x86/platform/efi/efi.c
> +++ linux-2.6/arch/x86/platform/efi/efi.c
> @@ -440,7 +440,7 @@ void __init efi_reserve_boot_services(vo
>  		 * - Not within any part of the kernel
>  		 * - Not the bios reserved area
>  		*/
> -		if ((start+size >= __pa_symbol(_text)
> +		if ((start + size - 1 >= __pa_symbol(_text)
>  				&& start <= __pa_symbol(_end)) ||
>  			!e820_all_mapped(start, start+size, E820_RAM) ||
>  			memblock_is_region_reserved(start, size)) {
--
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