From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761092AbZEMQPd (ORCPT ); Wed, 13 May 2009 12:15:33 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1760887AbZEMQOh (ORCPT ); Wed, 13 May 2009 12:14:37 -0400 Received: from e23smtp03.au.ibm.com ([202.81.31.145]:37347 "EHLO e23smtp03.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760898AbZEMQOg (ORCPT ); Wed, 13 May 2009 12:14:36 -0400 Date: Wed, 13 May 2009 21:44:28 +0530 From: "K.Prasad" To: Alan Stern Cc: Steven Rostedt , Frederic Weisbecker , Ingo Molnar , Linux Kernel Mailing List , Andrew Morton , Benjamin Herrenschmidt , maneesh@linux.vnet.ibm.com, Roland McGrath , Masami Hiramatsu , "K.Prasad" Subject: [Patch 07/12] Modify signal handling code to refrain from re-enabling HW Breakpoints Message-ID: <20090513161428.GH13911@in.ibm.com> References: <20090513160546.592373797@prasadkr_t60p.in.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline; filename=modify_signal_07 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 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: arch/x86/kernel/signal.c =================================================================== --- arch/x86/kernel/signal.c.orig +++ arch/x86/kernel/signal.c @@ -799,15 +799,6 @@ 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) { /*