linux-kernel - Re: drivers/staging/meilhaus build broken with ftrace

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Message-ID: <alpine.DEB.2.00.0908061849260.2840@gandalf.stny.rr.com>
Date:	Thu, 6 Aug 2009 18:51:26 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Greg KH <gregkh@...e.de>
cc:	Roland Dreier <rdreier@...co.com>,
	Matt Fleming <matt@...sole-pimps.org>,
	David Kiliani <mail@...idkiliani.de>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: drivers/staging/meilhaus build broken with ftrace

On Thu, 6 Aug 2009, Steven Rostedt wrote:
> Yes the module did something funky, but what broke recordmcount.pl was not 
> something that is not allowed. The code broke because a weak function was 
> the only function in a section. This patch keeps it from crashing.
> 
> Hmm, maybe I should make it warn, because a weak function by itself in a 
> section will not be traced.

Now the question is, is this a crucial enough change to push for 31, or 
should we leave this for 32?

This patch is small enough for 31, but to add a warning would require a 
little more code rework. I can queue this up for 31 and then have the 
warning ready for 32.

-- Steve
> 
> diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl
> index d29baa2..979da4b 100755
> --- a/scripts/recordmcount.pl
> +++ b/scripts/recordmcount.pl
> @@ -393,7 +393,7 @@ while (<IN>) {
>  	    $read_function = 0;
>  	}
>  	# print out any recorded offsets
> -	update_funcs() if ($text_found);
> +	update_funcs() if (defined($ref_func));
>  
>  	# reset all markers and arrays
>  	$text_found = 0;
> @@ -441,7 +441,7 @@ while (<IN>) {
>  }
>  
>  # dump out anymore offsets that may have been found
> -update_funcs() if ($text_found);
> +update_funcs() if (defined($ref_func));
>  
>  # If we did not find any mcount callers, we are done (do nothing).
>  if (!$opened) {
> 
--
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