linux-kernel - Re: [PATCH 1/3] devmem: change vread()/vwrite() prototype to return success or error code

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Date:	Tue, 14 Sep 2010 13:42:34 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Andi Kleen <andi@...stfloor.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, Tejun Heo <tj@...nel.org>,
	Nick Piggin <npiggin@...e.de>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [PATCH 1/3] devmem: change vread()/vwrite() prototype to return
 success or error code

On Wed, 16 Sep 2009 09:39:40 +0800
Wu Fengguang <fengguang.wu@...el.com> wrote:

> Silently ignore all vmalloc area holes in vread()/vwrite(),
> and report success (or error code in future) to the caller.
> 
> The original intention is to fix a vwrite() related bug, where
> it could return 0 which cannot be handled correctly by its caller
> write_kmem(). Then KAMEZAWA recommends to change the prototype
> to make the semantics clear.
> 
> CC: Andi Kleen <andi@...stfloor.org>
> CC: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> CC: Christoph Lameter <cl@...ux-foundation.org>
> CC: Ingo Molnar <mingo@...e.hu>
> CC: Tejun Heo <tj@...nel.org>
> CC: Nick Piggin <npiggin@...e.de>
> CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>

Okay, maybe it's good to change for now.

I sometimes wonder we should use copy_to/from_user to access vmalloc area...
but we have IO_REMAP. So, maybe vread/vwrite is required one.

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Thanks,
-Kame

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