linux-kernel - Re: [PATCH] Prevent reserving RAM in the region already reserved by BIOS

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Message-ID: <4BF42296.1030905@oracle.com>
Date:	Wed, 19 May 2010 10:40:38 -0700
From:	Yinghai <yinghai.lu@...cle.com>
To:	Mathieu Rondonneau <mathieu.rondonneau@...il.com>
CC:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] Prevent reserving RAM in the region already reserved
 by BIOS

On 05/18/2010 10:35 PM, Mathieu Rondonneau wrote:
> Does it make sense to prevent looking for stolen RAM below the ISA section.
> 
> 
> Signed-off-by: Mathieu Rondonneau <mathieu.rondonneau@...il.com>
> ---
>  arch/x86/kernel/e820.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
> index 7bca3c6..322c9c3 100644
> --- a/arch/x86/kernel/e820.c
> +++ b/arch/x86/kernel/e820.c
> @@ -1156,6 +1156,8 @@ void __init e820_reserve_resources_late(void)
>                         end = MAX_RESOURCE_SIZE;
>                 if (start >= end)
>                         continue;
> +               if (end < ISA_START_ADDRESS)
> +                       continue;
>                 printk(KERN_DEBUG "reserve RAM buffer: %016llx - %016llx ",
>                                start, end);
>                 reserve_region_with_split(&iomem_resource, start, end,

do you notice any changes in /proc/iomem?

YH
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