Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756697AbZCEEkv (ORCPT ); Wed, 4 Mar 2009 23:40:51 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754974AbZCEEki (ORCPT ); Wed, 4 Mar 2009 23:40:38 -0500 Received: from e23smtp08.au.ibm.com ([202.81.31.141]:52223 "EHLO e23smtp08.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753647AbZCEEkh (ORCPT ); Wed, 4 Mar 2009 23:40:37 -0500 Date: Thu, 5 Mar 2009 10:10:28 +0530 From: prasad@linux.vnet.ibm.com To: mingo@elte.hu Cc: Andrew Morton , Linux Kernel Mailing List , Alan Stern , Roland McGrath , "K.Prasad" Subject: [patch 07/11] Modify signal handling code to refrain from re-enabling HW Breakpoints Message-ID: <20090305044028.GH17747@in.ibm.com> References: <20090305043440.189041194@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline; filename=7 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: 1371 Lines: 38 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/arch/x86/kernel/signal.c =================================================================== --- linux-2.6-tip.orig/arch/x86/kernel/signal.c +++ linux-2.6-tip/arch/x86/kernel/signal.c @@ -795,15 +795,6 @@ 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) { /* -- 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/