linux-kernel - Re: [RFC/PATCH] mm/futex: Fix futex writes on archs with SW tracking of dirty & young

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Message-ID: <CAMjpGUdXfzt5HuDgspf6Bijm3xOPcck_JR38-AV2FSK0t99MTQ@mail.gmail.com>
Date:	Wed, 27 Jul 2011 17:12:32 -0700
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	David Howells <dhowells@...hat.com>,
	Shan Hai <haishan.bai@...il.com>, paulus@...ba.org,
	tglx@...utronix.de, walken@...gle.com, cmetcalf@...era.com,
	tony.luck@...el.com, akpm@...ux-foundation.org,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	uclinux-dist-devel@...ckfin.uclinux.org
Subject: Re: [RFC/PATCH] mm/futex: Fix futex writes on archs with SW tracking
 of dirty & young

On Wed, Jul 27, 2011 at 03:20, Benjamin Herrenschmidt wrote:
> Hoping the BUG() isn't trippable by userspace but then it's no mmu, it's
> not like we care what userspace can do right :-)

side note ... common misconception that "no mmu" == "no memory
protection".  a few of the nommu processors have memory protection,
just no virtual<->physical translation.

thanks for the patch !
-mike
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