Commit 6e39903c73df for kernel

commit 6e39903c73df08b256322d04c4dfe4a82ec63a45
Author: Fushuai Wang <wangfushuai@baidu.com>
Date:   Fri Jan 9 11:36:20 2026 +0800

    selftests/tracing: Fix test_multiple_writes stall

    When /sys/kernel/tracing/buffer_size_kb is less than 12KB,
    the test_multiple_writes test will stall and wait for more
    input due to insufficient buffer space.

    Check current buffer_size_kb value before the test. If it is
    less than 12KB, it temporarily increase the buffer to 12KB,
    and restore the original value after the tests are completed.

    Link: https://lore.kernel.org/r/20260109033620.25727-1-fushuai.wang@linux.dev
    Fixes: 37f46601383a ("selftests/tracing: Add basic test for trace_marker_raw file")
    Suggested-by: Steven Rostedt <rostedt@goodmis.org>
    Signed-off-by: Fushuai Wang <wangfushuai@baidu.com>
    Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
    Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

diff --git a/tools/testing/selftests/ftrace/test.d/00basic/trace_marker_raw.tc b/tools/testing/selftests/ftrace/test.d/00basic/trace_marker_raw.tc
index 7daf7292209e..a2c42e13f614 100644
--- a/tools/testing/selftests/ftrace/test.d/00basic/trace_marker_raw.tc
+++ b/tools/testing/selftests/ftrace/test.d/00basic/trace_marker_raw.tc
@@ -89,6 +89,7 @@ test_buffer() {
 	# The id must be four bytes, test that 3 bytes fails a write
 	if echo -n abc > ./trace_marker_raw ; then
 		echo "Too small of write expected to fail but did not"
+		echo ${ORIG} > buffer_size_kb
 		exit_fail
 	fi

@@ -99,9 +100,24 @@ test_buffer() {

 	if write_buffer 0xdeadbeef $size ; then
 		echo "Too big of write expected to fail but did not"
+		echo ${ORIG} > buffer_size_kb
 		exit_fail
 	fi
 }

+ORIG=`cat buffer_size_kb`
+
+# test_multiple_writes test needs at least 12KB buffer
+NEW_SIZE=12
+
+if [ ${ORIG} -lt ${NEW_SIZE} ]; then
+	echo ${NEW_SIZE} > buffer_size_kb
+fi
+
 test_buffer
-test_multiple_writes
+if ! test_multiple_writes; then
+	echo ${ORIG} > buffer_size_kb
+	exit_fail
+fi
+
+echo ${ORIG} > buffer_size_kb