linux-kernel - Re: 2.6.29 -mm merge plans

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Message-Id: <20090108172548.B932.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Thu,  8 Jan 2009 17:31:08 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Ying Han <yinghan@...gle.com>
Cc:	kosaki.motohiro@...fujitsu.com, Valdis.Kletnieks@...edu,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Mike Waychison <mikew@...gle.com>
Subject: Re: 2.6.29 -mm merge plans

> yes. the change is in the last few lines of the patch. I found out
> that the flags was set as FAULT_FLAG_WRITE no matter what(write/read)
> whence FAULT_FLAG_RETRY is set. the new patch changed the logic which
> only set the flag in the "write" case.
> 
> @@ -2713,8 +2720,10 @@ static int do_linear_fault(struct mm_struct *mm, struct
>  {
>        pgoff_t pgoff = (((address & PAGE_MASK)
>                        - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
> -       unsigned int flags = (write_access ? FAULT_FLAG_WRITE : 0);
> 
> +       int write = write_access & ~FAULT_FLAG_RETRY;
> +       unsigned int flags = (write ? FAULT_FLAG_WRITE : 0);

ok. it seems makes sense.
thanks.


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