Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756307Ab0BOTre (ORCPT ); Mon, 15 Feb 2010 14:47:34 -0500 Received: from mx1.redhat.com ([209.132.183.28]:17169 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756287Ab0BOTrc (ORCPT ); Mon, 15 Feb 2010 14:47:32 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit From: Roland McGrath To: Michael Stefaniuc X-Fcc: ~/Mail/linus Cc: prasad@linux.vnet.ibm.com, Frederic Weisbecker , Alan Stern , linux-kernel@vger.kernel.org, Maneesh Soni , Alexandre Julliard , "Rafael J. Wysocki" , Maciej Rutecki Subject: Re: Regression in ptrace (Wine) starting with 2.6.33-rc1 In-Reply-To: Michael Stefaniuc's message of Monday, 15 February 2010 20:37:31 +0100 <4B79A27B.6080607@redhat.com> References: <4B743149.4000707@redhat.com> <20100211182224.GC4915@nowhere> <4B745F5C.5050001@redhat.com> <20100213173323.GB3778@in.ibm.com> <4B7719AC.6040901@redhat.com> <20100214171535.GA5065@nowhere> <4B785952.8020706@redhat.com> <20100214204130.GD5479@nowhere> <4B7881AC.5070209@redhat.com> <20100215115713.GA8907@in.ibm.com> <4B79A27B.6080607@redhat.com> X-Zippy-Says: I predict that by 1993 everyone will live in and around LAS VEGAS and wear BEATLE HAIRCUTS! Message-Id: <20100215194724.8B5F519@magilla.sf.frob.com> Date: Mon, 15 Feb 2010 11:47:24 -0800 (PST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 881 Lines: 21 > - The other one with 'locally'/'globally' enabled breakpoints. There is no "local/global" enablement. That distinction is meaningless given the way the kernel uses the hardware. Which of those bits you set has no material effect on the watchpoint/trap behavior. The only regression is in the observed bit pattern read back from dr7. To be 100% compatible, the hw_breakpoint ptrace-compatibility front-end should record the state of the useless bits to report back, so the only differences from the bit pattern written are whatever ones the real hardware would have shown from writing dr7 and reading it back. Thanks, Roland -- 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/