linux-kernel - Re: [PATCH 14(16] pramfs: memory protection

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Message-ID: <20101012115639.GB20436@basil.fritz.box>
Date:	Tue, 12 Oct 2010 13:56:39 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Marco Stornelli <marco.stornelli@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux Embedded <linux-embedded@...r.kernel.org>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	Tim Bird <tim.bird@...sony.com>, linux-mm@...ck.org
Subject: Re: [PATCH 14(16] pramfs: memory protection

> per-arch?! Wow. Mmm...maybe I have to change something at fs level to
> avoid that. An alternative could be to use the follow_pte solution but
> avoid the protection via Kconfig if the fs is used on some archs (ia64
> or MIPS), with large pages and so on. An help of the kernel community
> to know all these particular cases is welcome.

It depends if the protection is a fundamental part of your design
(but if it is I would argue that's broken because it's really not very good
protection): If it's just an optional nice to have you can stub
it out on architectures that don't support it.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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