From: Andi Kleen <andi@firstfloor.org>
To: Mike Galbraith <bitbucket@online.de>
Cc: Andi Kleen <andi@firstfloor.org>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Ben Hutchings <ben@decadent.org.uk>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Steven Rostedt <rostedt@rostedt.homelinux.com>,
723180@bugs.debian.org, Brian Silverman <bsilver16384@gmail.com>,
LKML <linux-kernel@vger.kernel.org>,
linux-rt-users@vger.kernel.org
Subject: Re: [PATCH] Revert "x86: Disable IST stacks for debug/int 3/stack fault for PREEMPT_RT"
Date: Sun, 5 Jan 2014 19:04:47 +0100 [thread overview]
Message-ID: <20140105180446.GX20765@two.firstfloor.org> (raw)
In-Reply-To: <1388897147.5342.36.camel@marge.simpson.net>
On Sun, Jan 05, 2014 at 05:45:47AM +0100, Mike Galbraith wrote:
> On Sat, 2014-01-04 at 19:18 +0100, Andi Kleen wrote:
> > On Fri, Jan 03, 2014 at 02:55:48PM +0100, Sebastian Andrzej Siewior wrote:
> > > where do I start. Let me explain what is going on here. The code
> > > sequence
> >
> > Yes the IST stacks are needed for correctness, even in more cases than
> > the example below. You cannot just disable them, just because you don't
> > like them.
>
> You had a better reason than dislike.
Ah true it was me. Good point. I forgot all about that.
Probably it needs some form of the NMI style paranoid_* switch.
-Andi
next prev parent reply other threads:[~2014-01-05 18:04 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20130917061329.4872.51468.reportbug@dell-inspiron-linux.dlinkrouter>
[not found] ` <1379427451.23881.48.camel@deadeye.wl.decadent.org.uk>
[not found] ` <CAP01z6LVxoA6kDJeL8NuO2aA22BjMvXSk9ZY7z9cOK1=k56vpg@mail.gmail.com>
[not found] ` <1379905562.3913.8.camel@deadeye.wl.decadent.org.uk>
[not found] ` <CAP01z6+j6moUio9pc3G3iz+ebJCdKEvngddxnxazRP+NXwLkyg@mail.gmail.com>
2013-09-25 13:24 ` Double fault when single-stepping compat task with PREEMPT_RT Ben Hutchings
2013-12-15 19:33 ` Sebastian Andrzej Siewior
2014-01-03 13:55 ` [PATCH] Revert "x86: Disable IST stacks for debug/int 3/stack fault for PREEMPT_RT" Sebastian Andrzej Siewior
2014-01-04 18:18 ` Andi Kleen
2014-01-05 4:45 ` Mike Galbraith
2014-01-05 5:05 ` Mike Galbraith
2014-01-05 18:04 ` Andi Kleen [this message]
2014-01-06 11:32 ` Sebastian Andrzej Siewior
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