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

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Message-ID: <20070326140350.3c465073@the-village.bc.nu>
Date:	Mon, 26 Mar 2007 14:03:50 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	David Howells <dhowells@...hat.com>
Cc:	Pekka J Enberg <penberg@...helsinki.fi>,
	Andrew Morton <akpm@...ux-foundation.org>, bryan.wu@...log.com,
	linux-kernel@...r.kernel.org, Hugh Dickins <hugh@...itas.com>,
	dhowells@...hat.com
Subject: Re: [PATCH -mm] Revoke core code: fix nommu arch compiling error
 bug

> With NOMMU as it stands, private mappings are private copies of the data, and
> have no impact on the page cache and get no updates from it.  It's as if you
> took a private writable mapping, touched every page and then mprotect()'d it.
> This isn't necessarily ideal, but we're limited by the lack on an MMU.

Given the MMUless kernel has no security model the easiest is probably to
simply not support revoke() of mmap areas on NOMMU (or maybe not to
support revoke at all)

Alan
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