[PATCH 3/3] selftests/ftrace: Fix probepoint testcase to ignore __pfx_* symbols

["Masami Hiramatsu (Google)" <mhiramat@kernel.org>]

From: Masami Hiramatsu (Google) <mhiramat@kernel.org>

Fix kprobe probepoint testcase to ignore __pfx_* prefix symbols. Those are
introduced by commit b341b20d648b ("x86: Add prefix symbols for function
padding") for identifying PADDING_BYTES of NOPs. Since kprobe events can
not probe these prefix symbols, this testcase has to skip those symbols.

Fixes: b341b20d648b ("x86: Add prefix symbols for function padding")
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
---
 .../selftests/ftrace/test.d/kprobe/probepoint.tc   |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/probepoint.tc b/tools/testing/selftests/ftrace/test.d/kprobe/probepoint.tc
index 624269c8d534..68425987a5dd 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/probepoint.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/probepoint.tc
@@ -21,7 +21,7 @@ set_offs() { # prev target next
 
 # We have to decode symbol addresses to get correct offsets.
 # If the offset is not an instruction boundary, it cause -EILSEQ.
-set_offs `grep -A1 -B1 ${TARGET_FUNC} /proc/kallsyms | cut -f 1 -d " " | xargs`
+set_offs `grep -v __pfx_ /proc/kallsyms | grep -A1 -B1 ${TARGET_FUNC} | cut -f 1 -d " " | xargs`
 
 UINT_TEST=no
 # printf "%x" -1 returns (unsigned long)-1.