From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760796AbZBMQa0 (ORCPT ); Fri, 13 Feb 2009 11:30:26 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1761336AbZBMQ2n (ORCPT ); Fri, 13 Feb 2009 11:28:43 -0500 Received: from e23smtp07.au.ibm.com ([202.81.31.140]:52279 "EHLO e23smtp07.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1761307AbZBMQ2l (ORCPT ); Fri, 13 Feb 2009 11:28:41 -0500 Date: Fri, 13 Feb 2009 20:28:00 +0530 From: "K.Prasad" To: Ingo Molnar Cc: Andrew Morton , Alan Stern , Roland McGrath , richardj_moore@uk.ibm.com, jason.wessel@windriver.com Subject: [Patch 7/10] Modify signal handling code to refrain from re-enabling HW Breakpoints Message-ID: <20090213145800.GG32064@in.ibm.com> Reply-To: prasad@linux.vnet.ibm.com References: <20090213145301.GA31546@in.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090213145301.GA31546@in.ibm.com> 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 Modify signal handling code to refrain from re-enabling HW Breakpoints From: Alan Stern This patch disables re-enabling of Hardware Breakpoint registers through the signal handling code. This is now done during hw_breakpoint_handler(). Signed-off-by: K.Prasad Signed-off-by: Alan Stern --- arch/x86/kernel/signal.c | 9 --------- 1 file changed, 9 deletions(-) Index: linux-2.6-tip.hbkpt/arch/x86/kernel/signal.c =================================================================== --- linux-2.6-tip.hbkpt.orig/arch/x86/kernel/signal.c +++ linux-2.6-tip.hbkpt/arch/x86/kernel/signal.c @@ -803,15 +803,6 @@ static void do_signal(struct pt_regs *re signr = get_signal_to_deliver(&info, &ka, regs, NULL); if (signr > 0) { - /* - * Re-enable any watchpoints before delivering the - * signal to user space. The processor register will - * have been cleared if the watchpoint triggered - * inside the kernel. - */ - if (current->thread.debugreg7) - set_debugreg(current->thread.debugreg7, 7); - /* Whee! Actually deliver the signal. */ if (handle_signal(signr, &info, &ka, oldset, regs) == 0) { /*