linux-kernel - Re: [PATCH 3/3] access

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Date:	Tue, 05 Oct 2010 21:02:59 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Michel Lespinasse <walken@...gle.com>
CC:	linux-mm@...ck.org, Linus Torvalds <torvalds@...ux-foundation.org>,
	Ying Han <yinghan@...gle.com>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Nick Piggin <npiggin@...nel.dk>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 3/3] access_error API cleanup

On 10/05/2010 12:53 AM, Michel Lespinasse wrote:
> access_error() already takes error_code as an argument, so there is
> no need for an additional write flag.
> 
> Signed-off-by: Michel Lespinasse <walken@...gle.com>
> ---
>  arch/x86/mm/fault.c |    6 +++---
>  1 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
> index b355b92..844d46f 100644
> --- a/arch/x86/mm/fault.c
> +++ b/arch/x86/mm/fault.c
> @@ -915,9 +915,9 @@ spurious_fault(unsigned long error_code, unsigned long address)
>  int show_unhandled_signals = 1;
>  
>  static inline int
> -access_error(unsigned long error_code, int write, struct vm_area_struct *vma)
> +access_error(unsigned long error_code, struct vm_area_struct *vma)
>  {
> -	if (write) {
> +	if (error_code & PF_WRITE) {
>  		/* write, present and write, not present: */
>  		if (unlikely(!(vma->vm_flags & VM_WRITE)))
>  			return 1;
> @@ -1110,7 +1110,7 @@ retry:
>  	 * we can handle it..
>  	 */
>  good_area:
> -	if (unlikely(access_error(error_code, write, vma))) {
> +	if (unlikely(access_error(error_code, vma))) {
>  		bad_area_access_error(regs, error_code, address);
>  		return;
>  	}

Acked-by: H. Peter Anvin <hpa@...or.com>

I was going to put it into the x86 tree, but being part of a larger
series it gets messy.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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