From: "Bryan O'Sullivan" <bos@pathscale.com>
To: Hugh Dickins <hugh@veritas.com>
Cc: Roland Dreier <rdreier@cisco.com>, Andrew Morton <akpm@osdl.org>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
torvalds@osdl.org, hch@infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: Remapping pages mapped to userspace (was: [PATCH 10 of 20] ipath - support for userspace apps using core driver)
Date: Fri, 17 Mar 2006 09:17:28 -0800 [thread overview]
Message-ID: <1142615848.28538.53.camel@serpentine.pathscale.com> (raw)
In-Reply-To: <Pine.LNX.4.61.0603171631240.32660@goblin.wat.veritas.com>
On Fri, 2006-03-17 at 17:13 +0000, Hugh Dickins wrote:
> You seem to be asking to "revoke" an mmap:
Yes. We'd like this ability, too.
> Though it looks like subsequent userspace accesses will then go to
> do_anonymous_page, giving ZERO_PAGE to read faults or a fresh anon
> page to write faults: I think I'd prefer it if pte_none accesses in
> a VM_PFNMAP area gave SIGBUS, but unsure if we can change that now.
It would be unfortunate if userspace were spinning on a chip register,
waiting for the register to transition from zero to non-zero, and we
replaced that mapping with an anonymous page. In that case, userspace
could potentially spin forever, having no way to detect the demise of
the device.
<b
next prev parent reply other threads:[~2006-03-17 17:17 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <71644dd19420ddb07a75.1141922823@localhost.localdomain>
2006-03-09 23:28 ` [PATCH 10 of 20] ipath - support for userspace apps using core driver Roland Dreier
2006-03-09 23:55 ` Bryan O'Sullivan
2006-03-10 0:01 ` Roland Dreier
2006-03-10 0:07 ` Bryan O'Sullivan
2006-03-10 0:32 ` Roland Dreier
2006-03-10 0:36 ` Bryan O'Sullivan
2006-03-10 0:37 ` Andrew Morton
2006-03-10 0:50 ` Bryan O'Sullivan
2006-03-16 0:56 ` Bryan O'Sullivan
2006-03-16 1:51 ` Roland Dreier
2006-03-16 2:11 ` Bryan O'Sullivan
2006-03-16 2:37 ` Roland Dreier
2006-03-16 2:52 ` Bryan O'Sullivan
2006-03-16 2:56 ` Bryan O'Sullivan
2006-03-16 3:28 ` Andrew Morton
2006-03-16 4:58 ` Bryan O'Sullivan
2006-03-16 5:38 ` Andrew Morton
2006-03-16 5:54 ` Roland Dreier
2006-03-16 6:17 ` Andrew Morton
2006-03-16 6:44 ` Nick Piggin
2006-03-16 9:39 ` Andrew Morton
2006-03-16 10:00 ` Nick Piggin
2006-03-16 7:25 ` Roland Dreier
2006-03-16 16:46 ` Linus Torvalds
2006-03-16 14:57 ` Hugh Dickins
2006-03-16 6:31 ` Nick Piggin
2006-03-16 14:34 ` Hugh Dickins
2006-03-17 0:37 ` Nick Piggin
2006-03-17 1:09 ` Roland Dreier
2006-03-17 15:27 ` Hugh Dickins
2006-03-17 22:21 ` Nick Piggin
2006-03-17 16:11 ` Bryan O'Sullivan
2006-03-17 16:28 ` Linus Torvalds
2006-03-17 16:40 ` Bryan O'Sullivan
2006-03-17 22:28 ` Nick Piggin
2006-03-17 22:14 ` Nick Piggin
2006-03-16 15:12 ` Bryan O'Sullivan
2006-03-16 17:08 ` Linus Torvalds
2006-03-16 17:46 ` Hugh Dickins
2006-03-16 17:53 ` Bryan O'Sullivan
2006-03-16 14:24 ` Hugh Dickins
2006-03-16 15:33 ` Bryan O'Sullivan
2006-03-16 17:23 ` Hugh Dickins
2006-03-16 17:40 ` Bryan O'Sullivan
2006-03-16 19:52 ` Bryan O'Sullivan
2006-03-16 20:10 ` Hugh Dickins
2006-03-16 20:35 ` Linus Torvalds
2006-03-16 20:43 ` Bryan O'Sullivan
2006-03-21 20:52 ` Bryan O'Sullivan
2006-03-21 23:20 ` Hugh Dickins
2006-03-22 15:58 ` Bryan O'Sullivan
2006-03-22 16:19 ` Linus Torvalds
2006-03-22 16:43 ` Bryan O'Sullivan
2006-03-22 17:46 ` Hugh Dickins
2006-03-22 17:53 ` Bryan O'Sullivan
2006-03-16 23:37 ` Roland Dreier
2006-03-16 23:51 ` Remapping pages mapped to userspace (was: [PATCH 10 of 20] ipath - support for userspace apps using core driver) Roland Dreier
2006-03-16 23:56 ` Bryan O'Sullivan
2006-03-17 1:10 ` Remapping pages mapped to userspace Roland Dreier
2006-03-17 1:12 ` Roland Dreier
2006-03-17 1:28 ` Alan Cox
2006-03-17 2:16 ` Roland Dreier
2006-03-17 17:13 ` Remapping pages mapped to userspace (was: [PATCH 10 of 20] ipath - support for userspace apps using core driver) Hugh Dickins
2006-03-17 17:17 ` Bryan O'Sullivan [this message]
2006-03-17 17:30 ` Linus Torvalds
2006-03-17 18:20 ` Hugh Dickins
2006-03-17 22:58 ` Remapping pages mapped to userspace Roland Dreier
2006-03-16 15:08 ` [PATCH 10 of 20] ipath - support for userspace apps using core driver Bryan O'Sullivan
2006-03-16 17:27 ` Hugh Dickins
2006-03-16 17:44 ` Bryan O'Sullivan
2006-03-16 16:52 ` Bryan O'Sullivan
2006-03-16 3:58 ` Linus Torvalds
2006-03-16 4:53 ` Roland Dreier
2006-03-16 2:28 ` Linus Torvalds
2006-03-09 23:33 ` Roland Dreier
2006-03-09 23:56 ` Bryan O'Sullivan
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