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Date:	Mon, 26 Oct 2009 18:41:56 +0300
From:	Sergei Shtylyov <>
To:	Wu Zhangjin <>
	Frederic Weisbecker <>,,
	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


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

WBR, Sergei
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