linux-kernel - Re: [PATCH v2 2/6] mips dynamic function tracer support

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Message-Id: <1243613166.18071.1.camel@falcon>
Date:	Sat, 30 May 2009 00:06:06 +0800
From:	Wu Zhangjin <wuzhangjin@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
	Ralf Baechle <ralf@...ux-mips.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nicholas Mc Guire <der.herr@...r.at>
Subject: Re: [PATCH v2 2/6] mips dynamic function tracer support

On Fri, 2009-05-29 at 11:24 -0400, Steven Rostedt wrote:
> On Fri, 29 May 2009, wuzhangjin@...il.com wrote:
> > diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl
> > index 409596e..a5d2ace 100755
> > --- a/scripts/recordmcount.pl
> > +++ b/scripts/recordmcount.pl
> > @@ -213,6 +213,17 @@ if ($arch eq "x86_64") {
> >      if ($is_module eq "0") {
> >          $cc .= " -mconstant-gp";
> >      }
> > +
> > +} elsif ($arch eq "mips") {
> > +	$mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s_mcount\$";
> > +	$ld .= " -melf".$bits."btsmip";
> > +
> > +	$cc .= " -mno-abicalls -fno-pic ";
> > +
> > +    if ($bits == 64) {
> > +		$type = ".dword";
> > +    }
> > +
> >  } else {
> >      die "Arch $arch is not supported with CONFIG_FTRACE_MCOUNT_RECORD";
> >  }
> > @@ -441,12 +452,12 @@ if ($#converts >= 0) {
> >      #
> >      # Step 5: set up each local function as a global
> >      #
> > -    `$objcopy $globallist $inputfile $globalobj`;
> > +    `$objcopy $globallist $inputfile $globalobj 2>&1 >/dev/null`;
> >  
> >      #
> >      # Step 6: Link the global version to our list.
> >      #
> > -    `$ld -r $globalobj $mcount_o -o $globalmix`;
> > +    `$ld -r $globalobj $mcount_o -o $globalmix 2>&1 >/dev/null`;
> 
> We still need to find out why these are giving errors. I don't like the 
> idea of hiding errors that might be useful. The better way is to change 
> the code to avoid having any warnings or errors.

get it :-)
I'm tuning it currently. 

thanks!
Wu Zhangjin
> 
> -- Steve
> 
> 
> >  
> >      #
> >      # Step 7: Convert the local functions back into local symbols
> > @@ -454,7 +465,7 @@ if ($#converts >= 0) {
> >      `$objcopy $locallist $globalmix $inputfile`;
> >  
> >      # Remove the temp files
> > -    `$rm $globalobj $globalmix`;
> > +    `$rm $globalobj $globalmix 2>&1 >/dev/null`;
> >  
> >  } else {
> >  
> > -- 
> > 1.6.0.4
> > 
> > 

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