From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753393AbZGWVCg (ORCPT ); Thu, 23 Jul 2009 17:02:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753851AbZGWVCX (ORCPT ); Thu, 23 Jul 2009 17:02:23 -0400 Received: from hrndva-omtalb.mail.rr.com ([71.74.56.124]:37239 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753490AbZGWVCW (ORCPT ); Thu, 23 Jul 2009 17:02:22 -0400 Message-Id: <20090723210220.880275669@goodmis.org> References: <20090723210047.294710482@goodmis.org> User-Agent: quilt/0.46-1 Date: Thu, 23 Jul 2009 17:00:51 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Ingo Molnar , Andrew Morton , Thomas Gleixner , Frederic Weisbecker , Matt Fleming Subject: [PATCH 4/4] ftrace: Only update $offset when we update $ref_func Content-Disposition: inline; filename=0004-ftrace-Only-update-offset-when-we-update-ref_func.patch Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Matt Fleming 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 $ref_func's offset in the object file. The addends in __mcount_loc were calculated incorrectly, resulting in ftrace dynamically modifying addresses that weren't mcount call sites. Signed-off-by: Matt Fleming LKML-Reference: <1248365775-25196-2-git-send-email-matt@console-pimps.org> Signed-off-by: Steven Rostedt --- scripts/recordmcount.pl | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl index 16c5563..d29baa2 100755 --- a/scripts/recordmcount.pl +++ b/scripts/recordmcount.pl @@ -403,7 +403,6 @@ while () { # section found, now is this a start of a function? } elsif ($read_function && /$function_regex/) { $text_found = 1; - $offset = hex $1; $text = $2; # if this is either a local function or a weak function @@ -412,10 +411,12 @@ while () { if (!defined($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/) { -- 1.6.3.3 --