linux-kernel - Re: [patch 1/5] access_process_vm device memory infrastructure

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Date:	Fri, 16 May 2008 10:20:49 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Rik van Riel <riel@...hat.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	ajackson@...hat.com, airlied@...hat.com, benh@...nel.crashing.org
Subject: Re: [patch 1/5] access_process_vm device memory infrastructure

On Thu, 2008-05-15 at 13:53 -0400, Rik van Riel wrote:
> plain text document attachment
> (01-access_process_vm-device-memory.patch)
> Add the generic_access_phys access function and put the hooks in place
> to allow access_process_vm to access device or PPC Cell SPU memory.
> 
> Signed-off-by: Rik van Riel <riel@...hat.com>
> Signed-off-by: Benjamin Herrensmidt <benh@...nel.crashing.org>
> 

> Index: ptrace-2.6.26-rc2-mm1/include/linux/mm.h
> ===================================================================
> --- ptrace-2.6.26-rc2-mm1.orig/include/linux/mm.h	2008-05-15 13:50:13.000000000 -0400
> +++ ptrace-2.6.26-rc2-mm1/include/linux/mm.h	2008-05-15 13:50:18.000000000 -0400
> @@ -169,6 +169,12 @@ struct vm_operations_struct {
>  	/* notification that a previously read-only page is about to become
>  	 * writable, if an error is returned it will cause a SIGBUS */
>  	int (*page_mkwrite)(struct vm_area_struct *vma, struct page *page);
> +
> +	/* called by access_process_vm when get_user_pages() fails, typically
> +	 * for use by special VMAs that can switch between memory and hardware
> +	 */
> +	int (*access)(struct vm_area_struct *vma, unsigned long addr,
> +		      void *buf, int len, int write);


This bit misses corresponding Documentation/ changes.

Other than that it looks good.

Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>

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