[PATCH] trace_uprobe: Display correct offset in uprobe_events

Ravi Bangoria
2018-01-06T05:41:44Z

Recently, how the pointers being printed with %p has been changed
by commit ad67b74d2469 ("printk: hash addresses printed with %p").
This is causing a regression while showing offset in the
uprobe_events file. Instead of %p, use %px to display offset.

Before patch:

# perf probe -vv -x /tmp/a.out main
Opening /sys/kernel/debug/tracing//uprobe_events write=1
Writing event: p:probe_a/main /tmp/a.out:0x58c

# cat /sys/kernel/debug/tracing/uprobe_events
p:probe_a/main /tmp/a.out:0x0000000049a0f352

After patch:

# cat /sys/kernel/debug/tracing/uprobe_events
p:probe_a/main /tmp/a.out:0x000000000000058c

Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
---
kernel/trace/trace_uprobe.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 40592e7b3568..268029ae1be6 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -608,7 +608,7 @@ static int probes_seq_show(struct seq_file *m, void *v)

/* Don't print "0x (null)" when offset is 0 */
if (tu->offset) {
- seq_printf(m, "0x%p", (void *)tu->offset);
+ seq_printf(m, "0x%px", (void *)tu->offset);
} else {
switch (sizeof(void *)) {
case 4:
--
2.13.6