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(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)
 

module/os/linux/spl/spl-thread.c

@@ -152,26 +152,16 @@ spl_kthread_create(int (*func)(void *), void *data, const char namefmt[], ...)
 EXPORT_SYMBOL(spl_kthread_create);
 
 /*
- * The "why" argument indicates the allowable side-effects of the call:
- *
- * FORREAL:  Extract the next pending signal from p_sig into p_cursig;
- * stop the process if a stop has been requested or if a traced signal
- * is pending.
- *
- * JUSTLOOKING:  Don't stop the process, just indicate whether or not
- * a signal might be pending (FORREAL is needed to tell for sure).
+ * Extract the next pending signal from p_sig into p_cursig; stop the process
+ * if a stop has been requested or if a traced signal is pending.
  */
 int
-issig(int why)
+issig(void)
 {
-	ASSERT(why == FORREAL || why == JUSTLOOKING);
 
 	if (!signal_pending(current))
 		return (0);
 
-	if (why != FORREAL)
-		return (1);
-
 	struct task_struct *task = current;
 	spl_kernel_siginfo_t __info;
 	sigset_t set;

module/zfs/dmu_diff.c

@@ -116,7 +116,7 @@ diff_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
 	dmu_diffarg_t *da = arg;
 	int err = 0;
 
-	if (issig(JUSTLOOKING) && issig(FORREAL))
+	if (issig())
 		return (SET_ERROR(EINTR));
 
 	if (zb->zb_level == ZB_DNODE_LEVEL ||

module/zfs/dmu_objset.c

@@ -2365,7 +2365,7 @@ dmu_objset_space_upgrade(objset_t *os)
 		if (err != 0)
 			return (err);
 
-		if (issig(JUSTLOOKING) && issig(FORREAL))
+		if (issig())
 			return (SET_ERROR(EINTR));
 
 		objerr = dmu_bonus_hold(os, obj, FTAG, &db);

module/zfs/dmu_recv.c

@@ -3386,7 +3386,7 @@ dmu_recv_stream(dmu_recv_cookie_t *drc, offset_t *voffp)
 	 * stream, then we free drc->drc_rrd and exit.
 	 */
 	while (rwa->err == 0) {
-		if (issig(JUSTLOOKING) && issig(FORREAL)) {
+		if (issig()) {
 			err = SET_ERROR(EINTR);
 			break;
 		}

module/zfs/dmu_redact.c

@@ -912,7 +912,7 @@ perform_redaction(objset_t *os, redaction_list_t *rl,
 			object = prev_obj;
 		}
 		while (err == 0 && object <= rec->end_object) {
-			if (issig(JUSTLOOKING) && issig(FORREAL)) {
+			if (issig()) {
 				err = EINTR;
 				break;
 			}

module/zfs/dmu_send.c

@@ -2552,7 +2552,7 @@ dmu_send_impl(struct dmu_send_params *dspp)
 	while (err == 0 && !range->eos_marker) {
 		err = do_dump(&dsc, range);
 		range = get_next_range(&srt_arg->q, range);
-		if (issig(JUSTLOOKING) && issig(FORREAL))
+		if (issig())
 			err = SET_ERROR(EINTR);
 	}
 

module/zfs/zcp.c

@@ -780,8 +780,7 @@ zcp_lua_counthook(lua_State *state, lua_Debug *ar)
 	 * Check if we were canceled while waiting for the
 	 * txg to sync or from our open context thread
 	 */
-	if (ri->zri_canceled ||
-	    (!ri->zri_sync && issig(JUSTLOOKING) && issig(FORREAL))) {
+	if (ri->zri_canceled || (!ri->zri_sync && issig())) {
 		ri->zri_canceled = B_TRUE;
 		(void) lua_pushstring(state, "Channel program was canceled.");
 		(void) lua_error(state);

module/zfs/zfs_ioctl.c

@@ -2336,7 +2336,7 @@ zfs_ioc_snapshot_list_next(zfs_cmd_t *zc)
 	}
 
 	while (error == 0) {
-		if (issig(JUSTLOOKING) && issig(FORREAL)) {
+		if (issig()) {
 			error = SET_ERROR(EINTR);
 			break;
 		}

module/zfs/zfs_vnops.c

@@ -1419,7 +1419,7 @@ zfs_clone_range(znode_t *inzp, uint64_t *inoffp, znode_t *outzp,
 		len -= size;
 		done += size;
 
-		if (issig(JUSTLOOKING) && issig(FORREAL)) {
+		if (issig()) {
 			error = SET_ERROR(EINTR);
 			break;
 		}