ftrace: Only update $offset when we update $ref_func

The value of $offset should be the offset of $ref_func from the
beginning of the object file. Therefore, we should set both variables
together.

This fixes a bug I was hitting on sh where $offset (which is used to
calcualte the addends for the __mcount_loc entries) was being set
multiple times and didn't correspond to $ref_func's offset in the object
file. The addends in __mcount_loc were calculated incorrectly, resulting
in ftrace dynamically modifying addresses that weren't mcount call
sites.

Signed-off-by: Matt Fleming <matt@console-pimps.org>
LKML-Reference: <1248365775-25196-2-git-send-email-matt@console-pimps.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl
index 16c5563..d29baa2 100755 (executable)
--- a/scripts/recordmcount.pl
+++ b/scripts/recordmcount.pl
@@ -403,7 +403,6 @@ while (<IN>) {
     # section found, now is this a start of a function?
     } elsif ($read_function && /$function_regex/) {
        $text_found = 1;
-       $offset = hex $1;
        $text = $2;
 
        # if this is either a local function or a weak function
@@ -412,10 +411,12 @@ while (<IN>) {
        if (!defined($locals{$text}) && !defined($weak{$text})) {
            $ref_func = $text;
            $read_function = 0;
+           $offset = hex $1;
        } else {
            # if we already have a function, and this is weak, skip it
            if (!defined($ref_func) && !defined($weak{$text})) {
                $ref_func = $text;
+               $offset = hex $1;
            }
        }
     } elsif ($read_headers && /$mcount_section/) {