linux-kernel - [tip:perf/core] tracing/uprobes: Do not print '0x (null)' when offset is 0

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Message-ID: <tip-a2fb3382edbea83c6f2bf6ac15e3673b2e254aad@git.kernel.org>
Date:	Thu, 27 Aug 2015 23:43:09 -0700
From:	tip-bot for Wang Nan <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	rostedt@...dmis.org, wangnan0@...wei.com,
	linux-kernel@...r.kernel.org, namhyung@...nel.org,
	lizefan@...wei.com, mingo@...nel.org, tglx@...utronix.de,
	acme@...hat.com, hpa@...or.com, masami.hiramatsu.pt@...achi.com
Subject: [tip:perf/core] tracing/uprobes: Do not print '0x (null)'
  when offset is 0

Commit-ID:  a2fb3382edbea83c6f2bf6ac15e3673b2e254aad
Gitweb:     http://git.kernel.org/tip/a2fb3382edbea83c6f2bf6ac15e3673b2e254aad
Author:     Wang Nan <wangnan0@...wei.com>
AuthorDate: Wed, 26 Aug 2015 10:57:46 +0000
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 26 Aug 2015 10:43:01 -0300

tracing/uprobes: Do not print '0x (null)' when offset is 0

When manually added uprobe point with zero address, 'uprobe_events'
output '(null)' instead of 0x00000000:

  # echo p:probe_libc/abs_0 /path/to/lib.bin:0x0 arg1=%ax > \
            /sys/kernel/debug/tracing/uprobe_events

  # cat /sys/kernel/debug/tracing/uprobe_events
    p:probe_libc/abs_0 /path/to/lib.bin:0x          (null) arg1=%ax

 This patch fixes this behavior:

  # cat /sys/kernel/debug/tracing/uprobe_events
  p:probe_libc/abs_0 /path/to/lib.bin:0x0000000000000000

Signed-off-by: Wang Nan <wangnan0@...wei.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Zefan Li <lizefan@...wei.com>
Cc: pi3orama@....com
Link: http://lkml.kernel.org/r/1440586666-235233-8-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 kernel/trace/trace_uprobe.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index f97479f..d2f6d0b 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -601,7 +601,22 @@ static int probes_seq_show(struct seq_file *m, void *v)
 
 	seq_printf(m, "%c:%s/%s", c, tu->tp.call.class->system,
 			trace_event_name(&tu->tp.call));
-	seq_printf(m, " %s:0x%p", tu->filename, (void *)tu->offset);
+	seq_printf(m, " %s:", tu->filename);
+
+	/* Don't print "0x  (null)" when offset is 0 */
+	if (tu->offset) {
+		seq_printf(m, "0x%p", (void *)tu->offset);
+	} else {
+		switch (sizeof(void *)) {
+		case 4:
+			seq_printf(m, "0x00000000");
+			break;
+		case 8:
+		default:
+			seq_printf(m, "0x0000000000000000");
+			break;
+		}
+	}
 
 	for (i = 0; i < tu->tp.nr_args; i++)
 		seq_printf(m, " %s=%s", tu->tp.args[i].name, tu->tp.args[i].comm);
--
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