linux-kernel - Re: pm-hibernate : possible circular locking dependency detected

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: <200904081247.08712.rusty@rustcorp.com.au>
Date:	Wed, 8 Apr 2009 12:47:08 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Ingo Molnar <mingo@...e.hu>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Ming Lei <tom.leiming@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Linux-pm mailing list" <linux-pm@...ts.linux-foundation.org>,
	Linux Kernel List <linux-kernel@...r.kernel.org>,
	Gautham R Shenoy <ego@...ibm.com>
Subject: Re: pm-hibernate : possible circular locking dependency detected

On Tuesday 07 April 2009 16:35:53 Peter Zijlstra wrote:
> On Tue, 2009-04-07 at 13:56 +0930, Rusty Russell wrote:
> > Looks like this will be fixed by Andrew's work-on-cpu-in-own-thread
> > patch which I just put out the pull request for.
> 
> Would it make sense to teach it about a short-circuit like:
> 
> work_on_cpu() {
> 
>   if (cpumask_weight(current->cpus_allowed) == 1 && 
>       smp_processor_id() == cpu)
>     return do_work_right_here();

Does that happen much?  I guess put a counter in and see?

Rusty.
--
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/