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Date:	Tue, 27 Oct 2009 01:35:40 +0800
From:	Wu Zhangjin <>
	Frederic Weisbecker <>,
	Thomas Gleixner <>,
	Ralf Baechle <>,
	Richard Sandiford <>,
	Nicholas Mc Guire <>,
	David Daney <>,
	Adam Nemet <>,
	Patrik Kluba <>
Subject: Re: [PATCH -v6 07/13] tracing: add dynamic function tracer support
 for MIPS

On Mon, 2009-10-26 at 12:45 -0400, Steven Rostedt wrote:
> On Tue, 2009-10-27 at 00:35 +0800, Wu Zhangjin wrote:
> > If remove the long jump, we at least to change the $mcount_regex in
> > scripts/, the addr + 12 in arch/mips/include/asm/ftrace.h
> > and the _mcount & ftrace_caller in mcount.S and the ftrace_make_nop &
> > ftrace_make_call in arch/mips/kernel/ftrace.c back to the -v4 version.
> > 
> > I think this method of supporting module is not that BAD, no obvious
> > overhead added except the "lui...addiu..." and two more "nop"
> > instructions. and it's very understandable, so, just use this version?
> You don't nop the lui and addiu do you? If you do you will crash the
> machine.

Not test it yet, Seems what you have mentioned in another thread:

b  1f

is a good idea, it will only left one "lui" and one "b 1f" instruction

(I'm sleepy now, the time is Tue Oct 27 01:34:51 CST 2009 in China, See

	Wu Zhangjin

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