linux-kernel - Re: [patch] sched: fix b5d9d734 blunder in task_new

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1259086901.15249.121.camel@marge.simson.net>
Date:	Tue, 24 Nov 2009 19:21:41 +0100
From:	Mike Galbraith <efault@....de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [patch] sched: fix b5d9d734 blunder in task_new_fair()

On Tue, 2009-11-24 at 18:54 +0100, Peter Zijlstra wrote:
> On Tue, 2009-11-24 at 18:35 +0100, Peter Zijlstra wrote:
> > On Tue, 2009-11-24 at 18:07 +0100, Mike Galbraith wrote:
> > > >       if (p->sched_class->task_new) {
> > > >               /* can detect migration through: task_cpu(p) != smp_processor_id() */
> > > 
> > > What if the parent was migrated before we got here?
> > 
> > Well, the only case it really matters for is the child_runs_first crap,
> > which is basically broken on SMP anyway, so I don't think we care too
> > much if we race here.
> > 
> > Unless I missed some detail that is ;-)
> 
> 
> Also, we're running all this from the parent context, and we have
> preemption disabled, we're not going anywhere.

In sched_fork() and wake_up_new_process(), but in between?

	-Mike

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/