Retire unused spl_{mutex,rwlock}_{init_fini}

These functions are unused and can be removed along
with the spl-mutex.c and spl-rwlock.c source files.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Tomohiro Kusumi <kusumi.tomohiro@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes openzfs#9029

include/spl/sys/mutex.h

@@ -181,7 +181,4 @@ spl_mutex_lockdep_on_maybe(kmutex_t *mp)			\
 	/* NOTE: do not dereference mp after this point */	\
 }
 
-int spl_mutex_init(void);
-void spl_mutex_fini(void);
-
 #endif /* _SPL_MUTEX_H */

include/spl/sys/rwlock.h

@@ -196,10 +196,6 @@ RW_READ_HELD(krwlock_t *rwp)
 	downgrade_write(SEM(rwp));					\
 	spl_rw_lockdep_on_maybe(rwp);					\
 })
-
 /* END CSTYLED */
 
-int spl_rw_init(void);
-void spl_rw_fini(void);
-
 #endif /* _SPL_RWLOCK_H */

module/spl/Makefile.in

@@ -16,10 +16,8 @@ $(MODULE)-objs += spl-kmem.o
 $(MODULE)-objs += spl-kmem-cache.o
 $(MODULE)-objs += spl-kobj.o
 $(MODULE)-objs += spl-kstat.o
-$(MODULE)-objs += spl-mutex.o
 $(MODULE)-objs += spl-proc.o
 $(MODULE)-objs += spl-procfs-list.o
-$(MODULE)-objs += spl-rwlock.o
 $(MODULE)-objs += spl-taskq.o
 $(MODULE)-objs += spl-thread.o
 $(MODULE)-objs += spl-tsd.o

module/spl/spl-generic.c

@@ -694,51 +694,41 @@ spl_init(void)
 	if ((rc = spl_kvmem_init()))
 		goto out1;
 
-	if ((rc = spl_mutex_init()))
-		goto out2;
-
-	if ((rc = spl_rw_init()))
-		goto out3;
-
 	if ((rc = spl_tsd_init()))
-		goto out4;
+		goto out2;
 
 	if ((rc = spl_taskq_init()))
-		goto out5;
+		goto out3;
 
 	if ((rc = spl_kmem_cache_init()))
-		goto out6;
+		goto out4;
 
 	if ((rc = spl_vn_init()))
-		goto out7;
+		goto out5;
 
 	if ((rc = spl_proc_init()))
-		goto out8;
+		goto out6;
 
 	if ((rc = spl_kstat_init()))
-		goto out9;
+		goto out7;
 
 	if ((rc = spl_zlib_init()))
-		goto out10;
+		goto out8;
 
 	return (rc);
 
-out10:
-	spl_kstat_fini();
-out9:
-	spl_proc_fini();
 out8:
-	spl_vn_fini();
+	spl_kstat_fini();
 out7:
-	spl_kmem_cache_fini();
+	spl_proc_fini();
 out6:
-	spl_taskq_fini();
+	spl_vn_fini();
 out5:
-	spl_tsd_fini();
+	spl_kmem_cache_fini();
 out4:
-	spl_rw_fini();
+	spl_taskq_fini();
 out3:
-	spl_mutex_fini();
+	spl_tsd_fini();
 out2:
 	spl_kvmem_fini();
 out1:
@@ -755,8 +745,6 @@ spl_fini(void)
 	spl_kmem_cache_fini();
 	spl_taskq_fini();
 	spl_tsd_fini();
-	spl_rw_fini();
-	spl_mutex_fini();
 	spl_kvmem_fini();
 }