linux-kernel - Re: Why get_user

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Message-ID: <20080630145215.7953b78b@bike.lwn.net>
Date:	Mon, 30 Jun 2008 14:52:15 -0600
From:	Jonathan Corbet <corbet@....net>
To:	"Pan, Weimin" <weimin.pan@...com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Why  get_user_pages fails?

On Mon, 30 Jun 2008 20:45:47 +0000
"Pan, Weimin" <weimin.pan@...com> wrote:

> Do I have a way to map a range of phy memory to user virtual address
> and have the page structures built for that memory region? I know
> remap_pfn_range() doesn't work.

The question is: why are you taking this memory out of the kernel's
view in the first place?  You're telling the kernel not to manage that
memory, and it's listening to you - but you shouldn't then complain that
it's not managing that memory.

Again, if you would post your code, others would be in a better
position to help you.

jon
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