linux-kernel - [PATCH] tracing: disable kcov on trace

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Message-Id: <20220523063033.1778974-1-liu3101@purdue.edu>
Date:   Mon, 23 May 2022 06:30:33 +0000
From:   Congyu Liu <liu3101@...due.edu>
To:     dvyukov@...gle.com, andreyknvl@...il.com, rostedt@...dmis.org,
        mingo@...hat.com
Cc:     kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org,
        Congyu Liu <liu3101@...due.edu>
Subject: [PATCH] tracing: disable kcov on trace_preemptirq.c

Functions in trace_preemptirq.c could be invoked from early interrupt
code that bypasses kcov trace function's in_task() check. Disable kcov
on this file to reduce random code coverage.

Signed-off-by: Congyu Liu <liu3101@...due.edu>
---
 kernel/trace/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index d77cd8032213..0d261774d6f3 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -31,6 +31,10 @@ ifdef CONFIG_GCOV_PROFILE_FTRACE
 GCOV_PROFILE := y
 endif
 
+# Functions in this file could be invoked from early interrupt
+# code and produce random code coverage.
+KCOV_INSTRUMENT_trace_preemptirq.o := n
+
 CFLAGS_bpf_trace.o := -I$(src)
 
 CFLAGS_trace_benchmark.o := -I$(src)
-- 
2.34.1