linux-kernel - Re: [PATCH 5/8] vmalloc: simplify vread()/vwrite()

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Message-ID: <20100121054932.GD24236@localhost>
Date:	Thu, 21 Jan 2010 13:49:32 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Nick Piggin <npiggin@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <andi@...stfloor.org>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [PATCH 5/8] vmalloc: simplify vread()/vwrite()

On Wed, Jan 20, 2010 at 10:21:06PM -0700, KAMEZAWA Hiroyuki wrote:
> On Thu, 21 Jan 2010 13:05:21 +0800
> Wu Fengguang <fengguang.wu@...el.com> wrote:
> 
> > On Mon, Jan 18, 2010 at 07:23:43PM -0700, KAMEZAWA Hiroyuki wrote:

> > I did some audit and find that
> > 
> > - set_memory_uc(), set_memory_array_uc(), set_pages_uc(),
> >   set_pages_array_uc() are called EFI code and various video drivers,
> >   all of them don't touch HIGHMEM RAM
> > 
> > - Kame: ioremap() won't allow remap of physical RAM
> > 
> > So kmap_atomic() is safe.  Let's just settle on this patch?
> > 
> I recommend you to keep check on VM_IOREMAP. That was checked far before
> I started to see Linux. Some _unknown_ driver can call get_vm_area() and
> map arbitrary pages there.

OK, I'll turn this patch into a less radical one.

Thanks,
Fengguang
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