From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S967401AbcA1TqW (ORCPT ); Thu, 28 Jan 2016 14:46:22 -0500 Received: from mail-oi0-f68.google.com ([209.85.218.68]:35518 "EHLO mail-oi0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161197AbcA1TqS (ORCPT ); Thu, 28 Jan 2016 14:46:18 -0500 From: Jeffrey Merkey To: linux-kernel@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org, akpm@linux-foundation.org, linux.mdb@gmail.com, dzickus@redhat.com, dyoung@redhat.com, mnfhuang@gmail.com Subject: [PATCH 02/31] Add debugger entry points for X86 Date: Thu, 28 Jan 2016 12:46:14 -0700 Message-Id: <1454010374-28459-1-git-send-email-jeffmerkey@gmail.com> X-Mailer: git-send-email 1.8.3.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch series adds an export which can be set by system debuggers to direct the hard lockup and soft lockup detector to trigger a breakpoint exception and enter a debugger if one is active. It is assumed that if someone sets this variable, then an breakpoint handler of some sort will be actively loaded or registered via the notify die handler chain. This addition is extremely useful for debugging hard and soft lockups real time and quickly from a console debugger. Signed-off-by: Jeffrey Merkey --- arch/x86/include/asm/kdebug.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/x86/include/asm/kdebug.h b/arch/x86/include/asm/kdebug.h index e5f5dc9..cbe9004 100644 --- a/arch/x86/include/asm/kdebug.h +++ b/arch/x86/include/asm/kdebug.h @@ -3,6 +3,11 @@ #include +static inline void arch_breakpoint(void) +{ + asm(" int $3"); +} + struct pt_regs; /* Grossly misnamed. */ -- 1.8.3.1