tracing: in_irq() cleanup

Replace the obsolete and ambiguos macro in_irq() with new
macro in_hardirq().

Link: https://lkml.kernel.org/r/20210930000342.6016-1-changbin.du@gmail.com

Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Changbin Du <changbin.du@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

kernel/trace/trace.h

@@ -890,7 +890,7 @@ static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
 		 * is set, and called by an interrupt handler, we still
 		 * want to trace it.
 		 */
-		if (in_irq())
+		if (in_hardirq())
 			trace_recursion_set(TRACE_IRQ_BIT);
 		else
 			trace_recursion_clear(TRACE_IRQ_BIT);

kernel/trace/trace_functions_graph.c

@@ -120,7 +120,7 @@ static inline int ftrace_graph_ignore_irqs(void)
 	if (!ftrace_graph_skip_irqs || trace_recursion_test(TRACE_IRQ_BIT))
 		return 0;
 
-	return in_irq();
+	return in_hardirq();
 }
 
 int trace_graph_entry(struct ftrace_graph_ent *trace)