linux-kernel - [PATCH] tracing/selftests: Ignore __pfx

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Date:   Tue, 7 Feb 2023 13:51:47 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     LKML <linux-kernel@...r.kernel.org>,
        Linux Trace Kernel <linux-trace-kernel@...r.kernel.org>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        Shuah Khan <shuah@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH] tracing/selftests: Ignore __pfx_ symbols in kprobe test

From: "Steven Rostedt (Google)" <rostedt@...dmis.org>

The kprobe probepoint.tc test started failing because of the added __pfx_
symbols that were added because of -fpatchable-function-entry=X,Y causing
unwinders to see them as part of the previous functions. But kprobes can
not be added on top of them. The selftest looks for tracefs_create_dir and
picks it and the previous and following functions to add at their address.
This caused it to include __pfx_tracefs_create_dir which is invalid to
attach a kprobe to and caused the test to fail.

Fixes: 9f2899fe36a62 ("objtool: Add option to generate prefix symbols")
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 tools/testing/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..e1b7506c1b11 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.
-- 
2.39.0