linux-kernel - [tip:perf/urgent] perf probe: Finder fails to resolve function name to address

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Message-ID: <tip-ba28c59bc9ed8fb7b9a753cd88ee54a2c4f6265b@git.kernel.org>
Date:	Sat, 31 Mar 2012 00:44:17 -0700
From:	tip-bot for Prashanth Nageshappa <prashanth@...ux.vnet.ibm.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, linux-kernel@...r.kernel.org, hpa@...or.com,
	mingo@...nel.org, prashanth@...ux.vnet.ibm.com, ananth@...ibm.com,
	masami.hiramatsu.pt@...achi.com, rostedt@...dmis.org,
	srikar@...ux.vnet.ibm.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perf/urgent] perf probe:
  Finder fails to resolve function name to address

Commit-ID:  ba28c59bc9ed8fb7b9a753cd88ee54a2c4f6265b
Gitweb:     http://git.kernel.org/tip/ba28c59bc9ed8fb7b9a753cd88ee54a2c4f6265b
Author:     Prashanth Nageshappa <prashanth@...ux.vnet.ibm.com>
AuthorDate: Mon, 26 Mar 2012 15:36:49 +0530
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 28 Mar 2012 11:56:49 -0300

perf probe: Finder fails to resolve function name to address

If DIE entries corresponding to declarations appear before definition
entry, probe finder returns error instead of continuing to look further
for a definition entry.

This patch ensures we reach to the DIE entry corresponding to the
definition and get the function address.

V2: A simpler solution based on Masami's suggestion.

Signed-off-by: Prashanth Nageshappa <prashanth@...ux.vnet.ibm.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Ananth N Mavinakayanahalli <ananth@...ibm.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Link: http://lkml.kernel.org/r/4F703FB9.9020407@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/probe-finder.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 2cc162d..d448984 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -972,10 +972,12 @@ static int probe_point_search_cb(Dwarf_Die *sp_die, void *data)
 	struct dwarf_callback_param *param = data;
 	struct probe_finder *pf = param->data;
 	struct perf_probe_point *pp = &pf->pev->point;
+	Dwarf_Attribute attr;
 
 	/* Check tag and diename */
 	if (dwarf_tag(sp_die) != DW_TAG_subprogram ||
-	    !die_compare_name(sp_die, pp->function))
+	    !die_compare_name(sp_die, pp->function) ||
+	    dwarf_attr(sp_die, DW_AT_declaration, &attr))
 		return DWARF_CB_OK;
 
 	/* Check declared file */
--
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