[PATCH] x86_64: Fix off by one in e820_mapped

[PATCH] x86_64: Fix off by one in e820_mapped

[Eric W. Biederman]

This allows a valid iommu placed immediately after memory
to work, to be recognized as after the last byte of memory
and not overlapping it.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
---

 arch/x86_64/kernel/e820.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

a0929b87b8d0d059a10eb3e61da3d679d64980e1
diff --git a/arch/x86_64/kernel/e820.c b/arch/x86_64/kernel/e820.c
--- a/arch/x86_64/kernel/e820.c
+++ b/arch/x86_64/kernel/e820.c
@@ -85,7 +85,7 @@ int __init e820_mapped(unsigned long sta
 		struct e820entry *ei = &e820.map[i]; 
 		if (type && ei->type != type) 
 			continue;
-		if (ei->addr >= end || ei->addr + ei->size < start) 
+		if (ei->addr >= end || ei->addr + ei->size <= start) 
 			continue; 
 		return 1; 
 	} 

Re: [PATCH] x86_64: Fix off by one in e820_mapped

[Andi Kleen]

On Fri, Jul 29, 2005 at 12:53:56PM -0600, Eric W. Biederman wrote:
> 
> This allows a valid iommu placed immediately after memory
> to work, to be recognized as after the last byte of memory
> and not overlapping it.

Looks good thanks. I see Andrew has already queued it up.

-Andi

> 
> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
> ---
> 
>  arch/x86_64/kernel/e820.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> a0929b87b8d0d059a10eb3e61da3d679d64980e1
> diff --git a/arch/x86_64/kernel/e820.c b/arch/x86_64/kernel/e820.c
> --- a/arch/x86_64/kernel/e820.c
> +++ b/arch/x86_64/kernel/e820.c
> @@ -85,7 +85,7 @@ int __init e820_mapped(unsigned long sta
>  		struct e820entry *ei = &e820.map[i]; 
>  		if (type && ei->type != type) 
>  			continue;
> -		if (ei->addr >= end || ei->addr + ei->size < start) 
> +		if (ei->addr >= end || ei->addr + ei->size <= start) 
>  			continue; 
>  		return 1; 
>  	}