Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754041Ab0FIV6R (ORCPT ); Wed, 9 Jun 2010 17:58:17 -0400 Received: from mail-wy0-f174.google.com ([74.125.82.174]:60311 "EHLO mail-wy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752221Ab0FIV6P (ORCPT ); Wed, 9 Jun 2010 17:58:15 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=date:from:to:cc:subject:message-id:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; b=WI3Dlf5EFOf49BSudTRpRsqhgruA/meJIYdCPIktmZIZyXI88LVs4Z2adhnJWTUA7b xC2q9PGibEfFI+bL8PSyhQfn4rV7zlEXPzryHqL6EyDMtiO/0DsfVc4YwERLx7hQmPsl qFw5qETMAbatwFbH6rceD2nhGdgAX8KP6lLHs= Date: Wed, 9 Jun 2010 23:58:13 +0200 From: Frederic Weisbecker To: Jason Baron Cc: linux-kernel@vger.kernel.org, mingo@elte.hu, mathieu.desnoyers@polymtl.ca, hpa@zytor.com, tglx@linutronix.de, rostedt@goodmis.org, andi@firstfloor.org, roland@redhat.com, rth@redhat.com, mhiramat@redhat.com, avi@redhat.com, davem@davemloft.net, vgoyal@redhat.com, sam@ravnborg.org Subject: Re: [PATCH 01/13] jump label v9: notifier atomic call chain notrace Message-ID: <20100609215810.GA12752@nowhere> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1048 Lines: 27 On Wed, Jun 09, 2010 at 05:38:52PM -0400, Jason Baron wrote: > From: Mathieu Desnoyers > > In LTTng, being able to use the atomic notifier from cpu idle entry to > ensure the tracer flush the last events in the current subbuffer > requires the rcu read-side to be marked "notrace", otherwise it can end > up calling back into lockdep and the tracer. > > Also apply to the the die notifier. > > Signed-off-by: Mathieu Desnoyers > Signed-off-by: Jason Baron > Reviewed-by: Masami Hiramatsu > --- I don't understand the purpose of this patch. The only notifier I see that is used by jmp label is the module notifier, and I don't see how it can do bad things if we don't use the notrace version. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/