From: Andi Kleen <ak@muc.de>
To: Jeff Dike <jdike@karaya.com>
Cc: john stultz <johnstul@us.ibm.com>,
Linus Torvalds <torvalds@transmeta.com>, andrea <andrea@suse.de>,
lkml <linux-kernel@vger.kernel.org>,
george anzinger <george@mvista.com>,
Stephen Hemminger <shemminger@osdl.org>, Andi Kleen <ak@muc.de>
Subject: Re: [PATCH] linux-2.5.43_vsyscall_A0
Date: Sat, 19 Oct 2002 05:10:02 +0200 [thread overview]
Message-ID: <20021019031002.GA16404@averell> (raw)
In-Reply-To: <200210190352.WAA05769@ccure.karaya.com>
On Sat, Oct 19, 2002 at 05:52:53AM +0200, Jeff Dike wrote:
> johnstul@us.ibm.com said:
> > Since no one really brought up any issues with the code itself
> > (correct me if I'm wrong), here is the i386 vsyscall gettimeofday port
> > I sent last night, synced up and ready for integration.
>
> This vsyscall implementation breaks UML. Any app that's run inside UML
> that uses vsyscalls will get the host's vsyscalls rather than the UML
> vsyscalls.
Ugh.
Guess you'll have some problems then with UML on x86-64, which always uses
vgettimeofday. But it's only used for gettimeofday() currently, perhaps it's
not that bad when the UML child runs with the host's time.
I guess it would be possible to add some support for UML
to map own code over the vsyscall reserved locations. UML would need
to use the syscalls then. But it'll be likely ugly.
-Andi
next prev parent reply other threads:[~2002-10-19 3:04 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-18 22:57 [PATCH] linux-2.5.43_vsyscall_A0 john stultz
2002-10-18 22:58 ` [EXAMPLE CODE] linux-2.5.43_vsyscall_A0 john stultz
2002-10-19 3:52 ` [PATCH] linux-2.5.43_vsyscall_A0 Jeff Dike
2002-10-19 3:10 ` Andi Kleen [this message]
2002-10-19 4:49 ` Jeff Dike
2002-10-19 4:02 ` Andi Kleen
2002-10-19 4:16 ` Andrea Arcangeli
2002-10-20 2:59 ` Andi Kleen
2002-10-20 6:44 ` Elladan
2002-10-20 9:27 ` [discuss] " Andi Kleen
2002-10-20 10:58 ` Elladan
2002-10-20 11:20 ` Andi Kleen
2002-10-20 14:51 ` Andrea Arcangeli
2002-10-21 16:49 ` george anzinger
2002-10-20 13:19 ` Andreas Jaeger
2002-10-20 14:59 ` Andrea Arcangeli
2002-10-19 4:10 ` Andrea Arcangeli
2002-10-19 4:45 ` Andi Kleen
2002-10-19 5:01 ` Andrea Arcangeli
2002-10-19 23:43 ` Jeff Dike
2002-10-20 0:15 ` Andrea Arcangeli
2002-10-20 2:03 ` Jeff Dike
2002-10-20 2:33 ` Andrea Arcangeli
2002-10-22 5:07 ` Jeff Dike
2002-10-22 4:15 ` Andi Kleen
2002-10-22 4:29 ` Andrew Morton
2002-10-22 9:39 ` Alan Cox
2002-10-22 16:12 ` Andrew Morton
2002-10-22 5:08 ` Andrea Arcangeli
2002-10-22 5:27 ` Andrea Arcangeli
2002-10-22 7:24 ` Elladan
2002-10-22 7:40 ` Andrea Arcangeli
2002-10-23 5:12 ` Elladan
2002-10-23 5:43 ` Elladan
2002-10-23 17:51 ` Gerrit Huizenga
2002-10-21 15:43 ` Stephen Hemminger
2002-10-21 16:26 ` Andi Kleen
2002-10-21 17:10 ` john stultz
2002-10-19 19:14 ` Bill Davidsen
2002-10-20 1:50 ` Rik van Riel
2002-10-20 2:56 ` Andi Kleen
2002-10-24 11:24 ` Pavel Machek
2002-10-24 11:24 ` Pavel Machek
2002-10-19 22:36 ` Ton Hospel
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