Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753209AbZJZP5T (ORCPT ); Mon, 26 Oct 2009 11:57:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753158AbZJZP5T (ORCPT ); Mon, 26 Oct 2009 11:57:19 -0400 Received: from hrndva-omtalb.mail.rr.com ([71.74.56.125]:61072 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753155AbZJZP5S (ORCPT ); Mon, 26 Oct 2009 11:57:18 -0400 Subject: Re: [PATCH -v6 05/13] tracing: enable HAVE_FUNCTION_TRACE_MCOUNT_TEST for MIPS From: Steven Rostedt Reply-To: rostedt@goodmis.org To: Sergei Shtylyov Cc: Wu Zhangjin , linux-mips@linux-mips.org, linux-kernel@vger.kernel.org, Frederic Weisbecker , Thomas Gleixner , Ralf Baechle , Richard Sandiford , Nicholas Mc Guire , David Daney , Adam Nemet , Patrik Kluba In-Reply-To: <4AE5C344.4020104@ru.mvista.com> References: <747deea2f18d5ccffe842df95a9dd1c86251a958.1256569489.git.wuzhangjin@gmail.com> <3f47087b70a965fd679b17a59521671296457df1.1256569489.git.wuzhangjin@gmail.com> <07dc907ec62353b1aca99b2850d3b2e4b734189a.1256569489.git.wuzhangjin@gmail.com> <374da7039d2e1b97083edd8bcd7811356884d427.1256569489.git.wuzhangjin@gmail.com> <4AE5C344.4020104@ru.mvista.com> Content-Type: text/plain Organization: Kihon Technologies Inc. Date: Mon, 26 Oct 2009 11:57:20 -0400 Message-Id: <1256572640.26028.302.camel@gandalf.stny.rr.com> Mime-Version: 1.0 X-Mailer: Evolution 2.26.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1837 Lines: 73 On Mon, 2009-10-26 at 18:41 +0300, Sergei Shtylyov wrote: > Hello. > > Wu Zhangjin wrote: > > > There is an exisiting common ftrace_test_stop_func() in > > kernel/trace/ftrace.c, which is used to check the global variable > > ftrace_trace_stop to determine whether stop the function tracing. > > > This patch implepment the MIPS specific one to speedup the procedure. > > > Thanks goes to Zhang Le for Cleaning it up. > > > Signed-off-by: Wu Zhangjin > > [...] > > > diff --git a/arch/mips/kernel/mcount.S b/arch/mips/kernel/mcount.S > > index 0c39bc8..5dfaca8 100644 > > --- a/arch/mips/kernel/mcount.S > > +++ b/arch/mips/kernel/mcount.S > > @@ -64,6 +64,10 @@ > > .endm > > > > NESTED(_mcount, PT_SIZE, ra) > > + lw t0, function_trace_stop > > + bnez t0, ftrace_stub > > + nop > > 1) unless .set noreorder is specified in this file, explicit nop is not needed; >From patch 4: +++ b/arch/mips/kernel/mcount.S @@ -0,0 +1,89 @@ +/* + * MIPS specific _mcount support + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive for + * more details. + * + * Copyright (C) 2009 Lemote Inc. & DSLab, Lanzhou University, China + * Author: Wu Zhangjin + */ + +#include +#include +#include + + .text + .set noreorder + .set noat -- Steve > > 2) delay slot instruction is usually denoted by adding extra space on its > left, like this: > > bnez t0, ftrace_stub > nop -- 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/