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Tianchen DingandShuah Khan
65f26d15f7
On ARM64 kernels with 64K pages, the trace_marker_raw test fails because
bash's printf builtin uses stdio buffering which splits output into
multiple small write() calls to the tracefs file. Since each individual
write is within TRACE_MARKER_MAX_SIZE (4096), they all succeed, causing
the "too big" write test to incorrectly pass.
Fix by writing through dd with iflag=fullblock to guarantee a single
atomic write() syscall to trace_marker_raw.
Link: https://lore.kernel.org/r/20260601023251.1916483-1-dtcccc@linux.alibaba.com
Fixes: 37f4660138 ("selftests/tracing: Add basic test for trace_marker_raw file")
Signed-off-by: Tianchen Ding <dtcccc@linux.alibaba.com>
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>