linux-kernel - [PATCH v3 2/6] perf probe: Fix list result when neither dwarf nor map can't find symbol

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Date:	Wed, 26 Aug 2015 10:57:41 +0000
From:	Wang Nan <wangnan0@...wei.com>
To:	<acme@...nel.org>, <masami.hiramatsu.pt@...achi.com>,
	<rostedt@...dmis.org>
CC:	<mingo@...hat.com>, <namhyung@...nel.org>, <pi3orama@....com>,
	<lizefan@...wei.com>, <linux-kernel@...r.kernel.org>,
	Wang Nan <wangnan0@...wei.com>
Subject: [PATCH v3 2/6] perf probe: Fix list result when neither dwarf nor map can't find symbol

'perf probe -l' reports error if it is unable find symbol through
address. Here is an example.

 # echo 'p:probe_libc/abs_5 /lib64/libc.so.6:0x5' >
          /sys/kernel/debug/tracing/uprobe_events
 # cat /sys/kernel/debug/tracing/uprobe_events
  p:probe_libc/abs_5 /lib64/libc.so.6:0x0000000000000005
 # perf probe -l
   Error: Failed to show event list

Also, this situation triggers a logical inconsistency in
convert_to_perf_probe_point() that, it returns ENOMEM but actually
it never try strdup().

This patch removes !tp->module && !is_kprobe condition, so it
always uses address to build function name if symbol not found.

Test result:

 # perf probe -l
   probe_libc:abs_5     (on 0x5 in /lib64/libc.so.6)

Signed-off-by: Wang Nan <wangnan0@...wei.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
---
 tools/perf/util/probe-event.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 6c7e538..f7bacbb 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -1866,7 +1866,7 @@ static int convert_to_perf_probe_point(struct probe_trace_point *tp,
 	if (tp->symbol) {
 		pp->function = strdup(tp->symbol);
 		pp->offset = tp->offset;
-	} else if (!tp->module && !is_kprobe) {
+	} else {
 		ret = e_snprintf(buf, 128, "0x%" PRIx64, (u64)tp->address);
 		if (ret < 0)
 			return ret;
-- 
1.8.3.4

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