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
| ||
|
Date: Fri, 26 Mar 2010 03:18:14 +0000 From: Jamie Lokier <jamie@...reable.org> To: Peter Zijlstra <peterz@...radead.org> Cc: Nick Piggin <npiggin@...e.de>, Jan Kara <jack@...e.cz>, Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [rfc][patch] mm: lockdep page lock Peter Zijlstra wrote: > On Tue, 2010-03-16 at 13:21 +1100, Nick Piggin wrote: > > > > > > Agreed (btw. Peter is there any way to turn lock debugging back on? > > it's annoying when cpufreq hotplug code or something early breaks and > > you have to reboot in order to do any testing). > > Not really, the only way to do that is to get the full system back into > a known (zero) lock state and then fully reset the lockdep state. How about: Set a variable nr_pending = number of CPUs, run a task on each CPU which disables interrupts, atomically decrements nr_pending and then spins waiting for it to become negative (raw, not counted in lockdep), and whichever one takes it to zero, that task knows there are no locks held, and can reset the lockdep state. Then sets it to -1 to wake everyone. -- Jamie -- 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/
Powered by blists - more mailing lists