include/linux/stacktrace.h: declare struct task_struct

include/linux/stacktrace.h:13: warning:
'struct task_struct' declared inside parameter list

(This might be a hard error on sparc64, which uses this header and has
-Werror)

Reported-by: "Randy.Dunlap" <[e-mail]>
Acked-by: Ingo Molnar <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Arjan van de Ven <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

include/linux/stacktrace.h

···
 #ifndef __LINUX_STACKTRACE_H
 #define __LINUX_STACKTRACE_H
 
+struct task_struct;
+
 #ifdef CONFIG_STACKTRACE
 struct stack_trace {
 	unsigned int nr_entries, max_entries;