From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754248AbYJAQMf (ORCPT ); Wed, 1 Oct 2008 12:12:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752386AbYJAQMX (ORCPT ); Wed, 1 Oct 2008 12:12:23 -0400 Received: from smtp.polymtl.ca ([132.207.4.11]:38227 "EHLO smtp.polymtl.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752087AbYJAQMW (ORCPT ); Wed, 1 Oct 2008 12:12:22 -0400 Message-Id: <20081001160425.105054982@polymtl.ca> References: <20081001160324.889716972@polymtl.ca> User-Agent: quilt/0.46-1 Date: Wed, 01 Oct 2008 12:03:26 -0400 From: Mathieu Desnoyers To: Ingo Molnar , linux-kernel@vger.kernel.org Cc: Mathieu Desnoyers , Rusty Russell , akpm@linux-foundation.org, "Frank Ch. Eigler" Subject: [patch 2/5] Markers : marker_synchronize_unregister() Content-Disposition: inline; filename=markers-synchronize_marker_unregister.patch X-Poly-FromMTA: (test.casi.polymtl.ca [132.207.72.60]) at Wed, 1 Oct 2008 16:10:56 +0000 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Create marker_synchronize_unregister() which must be called before the end of exit() to make sure every probe callers have exited the non preemptible section and thus are not executing the probe code anymore. Signed-off-by: Mathieu Desnoyers CC: Ingo Molnar CC: Rusty Russell CC: akpm@linux-foundation.org CC: "Frank Ch. Eigler" --- include/linux/marker.h | 7 +++++++ 1 file changed, 7 insertions(+) Index: linux-2.6-lttng/include/linux/marker.h =================================================================== --- linux-2.6-lttng.orig/include/linux/marker.h 2008-07-31 09:12:52.000000000 -0400 +++ linux-2.6-lttng/include/linux/marker.h 2008-07-31 09:19:31.000000000 -0400 @@ -142,4 +142,11 @@ extern int marker_probe_unregister_priva extern void *marker_get_private_data(const char *name, marker_probe_func *probe, int num); +/* + * marker_synchronize_unregister must be called between the last marker probe + * unregistration and the end of module exit to make sure there is no caller + * executing a probe when it is freed. + */ +#define marker_synchronize_unregister() synchronize_sched() + #endif -- Mathieu Desnoyers Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68