From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932131Ab0EYJO1 (ORCPT ); Tue, 25 May 2010 05:14:27 -0400 Received: from e28smtp09.in.ibm.com ([122.248.162.9]:49422 "EHLO e28smtp09.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756320Ab0EYJOW (ORCPT ); Tue, 25 May 2010 05:14:22 -0400 Date: Tue, 25 May 2010 14:43:56 +0530 From: "K.Prasad" To: "linuxppc-dev@ozlabs.org" , Paul Mackerras , Linux Kernel Mailing List Cc: David Gibson , Roland McGrath , Frederic Weisbecker , Michael Neuling , Alan Stern , shaggy@linux.vnet.ibm.com, Benjamin Herrenschmidt , "K.Prasad" Subject: [Patch 1/4] Allow arch-specific cleanup before breakpoint unregistration Message-ID: <20100525091356.GB29003@in.ibm.com> References: <20100525083055.342788418@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline; filename=arch_unregister_hbp_02 User-Agent: Mutt/1.5.19 (2009-01-05) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Certain architectures (such as PowerPC Book III S) have a need to cleanup data-structures before the breakpoint is unregistered. This patch introduces an arch-specific hook in release_bp_slot() along with a weak definition in the form of a stub funciton. Signed-off-by: K.Prasad --- kernel/hw_breakpoint.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) Index: linux-2.6.ppc64_test/kernel/hw_breakpoint.c =================================================================== --- linux-2.6.ppc64_test.orig/kernel/hw_breakpoint.c +++ linux-2.6.ppc64_test/kernel/hw_breakpoint.c @@ -242,6 +242,17 @@ toggle_bp_slot(struct perf_event *bp, bo } /* + * Function to perform processor-specific cleanup during unregistration + */ +__weak void arch_unregister_hw_breakpoint(struct perf_event *bp) +{ + /* + * A weak stub function here for those archs that don't define + * it inside arch/.../kernel/hw_breakpoint.c + */ +} + +/* * Contraints to check before allowing this new breakpoint counter: * * == Non-pinned counter == (Considered as pinned for now) @@ -339,6 +350,7 @@ void release_bp_slot(struct perf_event * { mutex_lock(&nr_bp_mutex); + arch_unregister_hw_breakpoint(bp); __release_bp_slot(bp); mutex_unlock(&nr_bp_mutex);