From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: torvalds@transmeta.com (Linus Torvalds)
Cc: linux-kernel@vger.kernel.org
Subject: Re: BUG: Global FPU corruption in 2.2
Date: Tue, 24 Apr 2001 17:25:20 +0100 (BST) [thread overview]
Message-ID: <E14s5cx-0002PI-00@the-village.bc.nu> (raw)
In-Reply-To: <9c48gv$fbk$1@penguin.transmeta.com> from "Linus Torvalds" at Apr 24, 2001 09:10:07 AM
> >1.) If I'm not mistaken switch_to changes current->flags without
> >atomic operations and without any locks and sys_ptrace changes
> >child->flags only protected by the big kernel lock.
>
> ptrace only operates on processes that are stopped. So there are no
> locking issues - we've synchronized on a much higher level than a
> spinlock or semaphore.
In the 2.2 case the ptrace flags themselves are in the same flag set as
the PF_ flags. In 2.4 that was fixed. That means there are some bizarre cases
where current->flags might not be handled perfectly.
next prev parent reply other threads:[~2001-04-24 16:24 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-04-19 16:05 BUG: Global FPU corruption in 2.2 Victor Zandy
2001-04-19 20:18 ` Michal Jaegermann
2001-04-20 18:50 ` Victor Zandy
2001-04-20 19:07 ` Richard B. Johnson
2001-04-20 19:20 ` Victor Zandy
2001-04-20 19:44 ` Richard B. Johnson
2001-04-20 19:23 ` Ulrich Drepper
2001-04-20 19:37 ` Richard B. Johnson
2001-04-20 20:20 ` Victor Zandy
2001-04-20 21:44 ` Ulrich Drepper
2001-04-22 1:46 ` Richard B. Johnson
2001-04-22 2:18 ` Alan Cox
2001-04-22 2:30 ` Richard B. Johnson
2001-04-22 18:39 ` David Konerding
2001-04-22 18:59 ` Alan Cox
2001-04-22 20:59 ` kees
2001-04-23 16:11 ` Christian Ehrhardt
2001-04-24 16:10 ` Linus Torvalds
2001-04-24 16:25 ` Alan Cox [this message]
2001-04-24 16:56 ` Christian Ehrhardt
2001-04-24 20:15 ` Michal Jaegermann
2001-04-24 19:49 ` BUG: USB/Reboot Collectively Unconscious
2001-04-24 21:41 ` Alan Cox
2001-04-25 12:37 ` Collectively Unconscious
2001-04-30 22:46 ` Alan Cox
2001-04-27 12:18 ` Collectively Unconscious
2001-04-23 18:44 ` BUG: Global FPU corruption in 2.2 Erik Paulson
2001-04-24 5:33 alad
2001-04-24 7:56 alad
2001-04-24 8:56 alad
2001-04-24 13:05 Victor Zandy
2001-04-24 16:24 ` Linus Torvalds
2001-04-24 16:47 ` Christian Ehrhardt
2001-04-24 18:09 ` Victor Zandy
2001-04-24 18:21 Victor Zandy
2001-04-24 18:37 ` Alan Cox
2001-04-24 19:17 ` Victor Zandy
2001-04-24 19:51 ` Alan Cox
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