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The trace_printk() macro uses a local variable _______STR to detect whether variadic arguments are present. This name can shadow outer variables. Replace the local variable with sizeof applied directly to the stringified arguments: if (sizeof __stringify((__VA_ARGS__)) > 3) This eliminates the shadowing risk entirely without introducing any additional includes or local variables. Verified with objdump on samples/trace_printk that all four cases branch correctly: __trace_bputs, __trace_puts, __trace_bprintk, and __trace_printk. Link: https://patch.msgid.link/20260502075535.34997-1-tiffany019230@gmail.com Suggested-by: David Laight <david.laight.linux@gmail.com> Signed-off-by: Qian-Yu Lin <tiffany019230@gmail.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>