Simplify issig().

We always call it twice with JUSTLOOKING and then FORREAL.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Pawel Jakub Dawidek <pawel@dawidek.net>
Closes #16225

include/os/freebsd/spl/sys/sig.h

@@ -39,20 +39,14 @@
 #include <sys/signalvar.h>
 #include <sys/debug.h>
 
-#define	FORREAL		0
-#define	JUSTLOOKING	1
-
 static __inline int
-issig(int why)
+issig(void)
 {
 	struct thread *td = curthread;
 	struct proc *p;
 	int sig;
 
-	ASSERT(why == FORREAL || why == JUSTLOOKING);
 	if (SIGPENDING(td)) {
-		if (why == JUSTLOOKING)
-			return (1);
 		p = td->td_proc;
 		PROC_LOCK(p);
 		mtx_lock(&p->p_sigacts->ps_mtx);

include/os/linux/spl/sys/signal.h

@@ -30,9 +30,6 @@
 #include <linux/sched/signal.h>
 #endif
 
-#define	FORREAL		0	/* Usual side-effects */
-#define	JUSTLOOKING	1	/* Don't stop the process */
-
-extern int issig(int why);
+extern int issig(void);
 
 #endif /* SPL_SIGNAL_H */

include/sys/zfs_context.h

@@ -249,8 +249,7 @@ extern struct proc p0;
 extern kthread_t *zk_thread_create(const char *name, void (*func)(void *),
     void *arg, size_t stksize, int state);
 
-#define	issig(why)	(FALSE)
-#define	ISSIG(thr, why)	(FALSE)
+#define	issig()		(FALSE)
 
 #define	KPREEMPT_SYNC		(-1)