linux-kernel - Re: Please revert fc4c73554c9d93b3e495f2f7acae1323b0d5db84. Re: [PATCH 1/2] ftrace: Fix the conditional that updates $ref

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Date:	Wed, 5 Aug 2009 15:33:48 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Dave Airlie <airlied@...il.com>
cc:	Matt Fleming <matt@...sole-pimps.org>, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	linux-kernel@...r.kernel.org, Dave Jones <davej@...emonkey.org.uk>
Subject: Re: Please revert fc4c73554c9d93b3e495f2f7acae1323b0d5db84. Re:
 [PATCH  1/2] ftrace: Fix the conditional that updates $ref_func


On Wed, 5 Aug 2009, Dave Airlie wrote:

> On Fri, Jul 24, 2009 at 2:16 AM, Matt Fleming<matt@...sole-pimps.org> wrote:
> > Fix the conditional that checks if we already have a $ref_func and that
> > the new function is weak. The code as previously checking whether either
> > condition was false, and we really need to only update $ref_func is both
> > cconditions are false.
> >
> 
> This breaks the powerpc build on Fedora.
> 
> When building on ppc64 this commit causes the links of drivers/hwmon/lm93.o
> to fail.
> 
> It introduces an undefined symbol
>                  U .LM93_IN_FROM_REG
> 
> that isn't produced when this patch is reverted
> 
> This was found when the Fedora kernel failed to build when I pulled in
> -rc5-git3.
> 
> can be seen at the end of:
> http://koji.fedoraproject.org/koji/getfile?taskID=1582002&name=build.log
> 
> So can we revert this (at this stage in -rc5 or maybe fix it).
> 

I was not able to reproduce it, but could you see if this patch fixes the 
issue?

-- Steve

diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl
index d29baa2..a6bfecb 100755
--- a/scripts/recordmcount.pl
+++ b/scripts/recordmcount.pl
@@ -402,7 +402,6 @@ while (<IN>) {
 
     # section found, now is this a start of a function?
     } elsif ($read_function && /$function_regex/) {
-	$text_found = 1;
 	$text = $2;
 
 	# if this is either a local function or a weak function
@@ -412,11 +411,13 @@ while (<IN>) {
 	    $ref_func = $text;
 	    $read_function = 0;
 	    $offset = hex $1;
+	    $text_found = 1;
 	} else {
 	    # if we already have a function, and this is weak, skip it
 	    if (!defined($ref_func) && !defined($weak{$text})) {
 		$ref_func = $text;
 		$offset = hex $1;
+		$text_found = 1;
 	    }
 	}
     } elsif ($read_headers && /$mcount_section/) {
--
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