Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760965AbZCXP2w (ORCPT ); Tue, 24 Mar 2009 11:28:52 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759548AbZCXP1X (ORCPT ); Tue, 24 Mar 2009 11:27:23 -0400 Received: from e28smtp01.in.ibm.com ([59.145.155.1]:51458 "EHLO e28smtp01.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760226AbZCXP1W (ORCPT ); Tue, 24 Mar 2009 11:27:22 -0400 Date: Tue, 24 Mar 2009 20:56:50 +0530 From: "K.Prasad" To: Ingo Molnar , Linux Kernel Mailing List Cc: Alan Stern , Andrew Morton , Benjamin Herrenschmidt , Frederic Weisbecker , maneesh@linux.vnet.ibm.com, Roland McGrath , Steven Rostedt , "K.Prasad" Subject: [Patch 07/11] Modify signal handling code to refrain from re-enabling HW Breakpoints Message-ID: <20090324152650.GH17918@in.ibm.com> References: <20090324152028.754123712@K.Prasad> 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 @@ -800,15 +800,6 @@ 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/