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Date: Mon, 14 Dec 2009 17:23:22 -0800 From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> To: Peter Zijlstra <peterz@...radead.org> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Thomas Gleixner <tglx@...utronix.de>, LKML <linux-kernel@...r.kernel.org>, Dipankar Sarma <dipankar@...ibm.com>, Ingo Molnar <mingo@...e.hu>, Oleg Nesterov <oleg@...sign.ru>, Al Viro <viro@...iv.linux.org.uk>, James Morris <jmorris@...ei.org>, David Howells <dhowells@...hat.com>, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: [patch 0/9] Fix various __task_cred related invalid RCU assumptions On Mon, Dec 14, 2009 at 03:30:39PM +0100, Peter Zijlstra wrote: > On Mon, 2009-12-14 at 06:16 -0800, Paul E. McKenney wrote: > > > > I think you can use lock_is_held(&rcu_lock_map), except you need to deal > > > with the !debug_locks case, because lockdep stops once debug_locks > > > becomes false, which means lock_is_held() will return rubbish. > > > > OK, so I need to do something like the following, then? > > > > debug_locks ? lock_is_held(&rcu_lock_map) : 1 > > Depending on what the safe return value is, yeah. If you want an assert > like function, false is usually the safe one. > > #define lockdep_assert_held(l) WARN_ON(debug_locks && !lockdep_is_held(l)) > > is the one in-tree user of this. Sounds good, thank you for the tip!!! Thanx, Paul -- 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/
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