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Extend trace_printk coverage to verify that UTF-8 literal text is emitted successfully and that '%' parsing still rejects non-ASCII bytes once format parsing starts. Use an explicitly invalid format string for the negative case so the ASCII-only parser expectation is visible from the test code itself. Signed-off-by: Yihan Ding <dingyihan@uniontech.com> Acked-by: Paul Chaignon <paul.chaignon@gmail.com> Link: https://lore.kernel.org/r/20260416120142.1420646-3-dingyihan@uniontech.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>