Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752949AbZJZPmH (ORCPT ); Mon, 26 Oct 2009 11:42:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752912AbZJZPmH (ORCPT ); Mon, 26 Oct 2009 11:42:07 -0400 Received: from gateway-1237.mvista.com ([206.112.117.35]:39287 "HELO imap.sh.mvista.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with SMTP id S1752571AbZJZPmG (ORCPT ); Mon, 26 Oct 2009 11:42:06 -0400 Message-ID: <4AE5C344.4020104@ru.mvista.com> Date: Mon, 26 Oct 2009 18:41:56 +0300 From: Sergei Shtylyov Organization: MontaVista Software Inc. User-Agent: Mozilla/5.0 (X11; U; Linux i686; rv:1.7.2) Gecko/20040803 X-Accept-Language: ru, en-us, en-gb MIME-Version: 1.0 To: Wu Zhangjin Cc: linux-mips@linux-mips.org, linux-kernel@vger.kernel.org, Frederic Weisbecker , rostedt@goodmis.org, Thomas Gleixner , Ralf Baechle , Richard Sandiford , Nicholas Mc Guire , David Daney , Adam Nemet , Patrik Kluba Subject: Re: [PATCH -v6 05/13] tracing: enable HAVE_FUNCTION_TRACE_MCOUNT_TEST for MIPS 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> In-Reply-To: <374da7039d2e1b97083edd8bcd7811356884d427.1256569489.git.wuzhangjin@gmail.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1164 Lines: 42 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; 2) delay slot instruction is usually denoted by adding extra space on its left, like this: bnez t0, ftrace_stub nop WBR, Sergei -- 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/