linux-kernel - Re: [PATCH -mm] Revoke core code: fix nommu arch compiling error bug

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Message-ID: <Pine.LNX.4.64.0703261427490.12793@sbz-30.cs.Helsinki.FI>
Date:	Mon, 26 Mar 2007 14:30:34 +0300 (EEST)
From:	Pekka J Enberg <penberg@...helsinki.fi>
To:	David Howells <dhowells@...hat.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>, bryan.wu@...log.com,
	linux-kernel@...r.kernel.org, Hugh Dickins <hugh@...itas.com>
Subject: Re: [PATCH -mm] Revoke core code: fix nommu arch compiling error
 bug

Hi David,

On Mon, 26 Mar 2007, David Howells wrote:
> The reason is that, at the moment, VMAs are a global *shared* resource in
> NOMMU-mode.  Each process has a list of global VMAs that it subscribes to, but
> that's it.  This (a) slightly reduces the amount of metadata allocated
> (possibly), and (b) makes sharing of executables and libraries much easier.

On Mon, 26 Mar 2007, David Howells wrote:
> I wonder if revoke_mm() is something that you can't do in NOMMU-mode.  What
> does it do?

The revoke_mm() function scans all vmas of a mm and revokes those that 
are shared and point to the inode being revoked. So, NOMMU can't do that.

But what's more important is, can we do revoke_mapping() for NOMMU? AFAICT 
we can, we just need to scan all the global vmas, right?

				Pekka
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