tracing: Add MODULE_DESCRIPTION() to preemptirq_delay_test

Fix the 'make W=1' warning:

WARNING: modpost: missing MODULE_DESCRIPTION() in kernel/trace/preemptirq_delay_test.o

Link: https://lore.kernel.org/linux-trace-kernel/[email protected]

Cc: [email protected]
Cc: Mathieu Desnoyers <[email protected]>
Fixes: f96e857 ("lib: Add module for testing preemptoff/irqsoff latency tracers")
Acked-by: Masami Hiramatsu (Google) <[email protected]>
Signed-off-by: Jeff Johnson <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>

Author: Jeff Johnson

kernel/trace/preemptirq_delay_test.c

@@ -215,4 +215,5 @@ static void __exit preemptirq_delay_exit(void)
 
 module_init(preemptirq_delay_init)
 module_exit(preemptirq_delay_exit)
+MODULE_DESCRIPTION("Preempt / IRQ disable delay thread to test latency tracers");
 MODULE_LICENSE("GPL v2");