linux-kernel - [PATCH -tip 2/5] [BUGFIX] perf probe: Fix line walker to check CU correctly

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Date:	Sun, 10 Jul 2011 19:00:21 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Ingo Molnar <mingo@...e.hu>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, yrl.pp-manager.tt@...achi.com,
	Masami Hiramatsu <masami.hiramatsu@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: [PATCH -tip 2/5] [BUGFIX] perf probe: Fix line walker to check CU
 correctly

Fix line walker to check whether a given DIE is CU or not.
Actually this function accepts CU, subprogram and
inlined_subroutine DIEs.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu@...il.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
---

 tools/perf/util/probe-finder.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 1a35637..52b87f3 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -599,8 +599,9 @@ static int __die_walk_culines_cb(Dwarf_Die *sp_die, void *data)
 }
 
 /*
- * Walk on lines inside given PDIE. If the PDIE is subprogram, walk only on
- * the lines inside the subprogram, otherwise PDIE must be a CU DIE.
+ * Walk on lines inside given PDIE. If the PDIE is subprogram or
+ * inlined_subprogram, walk only on the lines inside the DIE,
+ * otherwise PDIE must be a CU DIE.
  */
 static int die_walk_lines(Dwarf_Die *pdie, line_walk_handler_t handler,
 			  void *data)
@@ -614,12 +615,12 @@ static int die_walk_lines(Dwarf_Die *pdie, line_walk_handler_t handler,
 	size_t nlines, i;
 
 	/* Get the CU die */
-	if (dwarf_tag(pdie) == DW_TAG_subprogram)
+	if (dwarf_tag(pdie) != DW_TAG_compile_unit)
 		cu_die = dwarf_diecu(pdie, &die_mem, NULL, NULL);
 	else
 		cu_die = pdie;
 	if (!cu_die) {
-		pr_debug2("Failed to get CU from subprogram\n");
+		pr_debug2("Failed to get CU from given DIE\n");
 		return -EINVAL;
 	}
 

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