Prefer VERIFY0P(n) over VERIFY3P(n, ==, NULL)

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Sponsored-by: https://despairlabs.com/sponsor/
Closes #17591

module/os/linux/zfs/abd_os.c

@@ -863,9 +863,9 @@ abd_iter_advance(struct abd_iter *aiter, size_t amount)
 	 * Ensure that last chunk is not in use. abd_iterate_*() must clear
 	 * this state (directly or abd_iter_unmap()) before advancing.
 	 */
-	ASSERT3P(aiter->iter_mapaddr, ==, NULL);
+	ASSERT0P(aiter->iter_mapaddr);
 	ASSERT0(aiter->iter_mapsize);
-	ASSERT3P(aiter->iter_page, ==, NULL);
+	ASSERT0P(aiter->iter_page);
 	ASSERT0(aiter->iter_page_doff);
 	ASSERT0(aiter->iter_page_dsize);
 
@@ -897,7 +897,7 @@ abd_iter_map(struct abd_iter *aiter)
 	void *paddr;
 	size_t offset = 0;
 
-	ASSERT3P(aiter->iter_mapaddr, ==, NULL);
+	ASSERT0P(aiter->iter_mapaddr);
 	ASSERT0(aiter->iter_mapsize);
 
 	/* There's nothing left to iterate over, so do nothing */

module/os/linux/zfs/vdev_disk.c

@@ -552,7 +552,7 @@ vdev_bio_associate_blkg(struct bio *bio)
 #endif
 
 	ASSERT3P(q, !=, NULL);
-	ASSERT3P(bio->bi_blkg, ==, NULL);
+	ASSERT0P(bio->bi_blkg);
 
 	if (q->root_blkg && vdev_blkg_tryget(q->root_blkg))
 		bio->bi_blkg = q->root_blkg;
@@ -574,7 +574,7 @@ vdev_bio_set_dev(struct bio *bio, struct block_device *bdev)
 	bio->bi_bdev = bdev;
 
 	ASSERT3P(q, !=, NULL);
-	ASSERT3P(bio->bi_blkg, ==, NULL);
+	ASSERT0P(bio->bi_blkg);
 
 	if (q->root_blkg && vdev_blkg_tryget(q->root_blkg))
 		bio->bi_blkg = q->root_blkg;
@@ -806,7 +806,7 @@ vbio_completion(struct bio *bio)
 	 * here; instead we stash vbio on the zio and take care of it in the
 	 * done callback.
 	 */
-	ASSERT3P(zio->io_bio, ==, NULL);
+	ASSERT0P(zio->io_bio);
 	zio->io_bio = vbio;
 
 	zio_delay_interrupt(zio);

module/os/linux/zfs/zfs_ctldir.c

@@ -494,9 +494,9 @@ zfsctl_inode_alloc(zfsvfs_t *zfsvfs, uint64_t id,
 	if (!creation)
 		now = current_time(ip);
 	zp = ITOZ(ip);
-	ASSERT3P(zp->z_dirlocks, ==, NULL);
-	ASSERT3P(zp->z_acl_cached, ==, NULL);
-	ASSERT3P(zp->z_xattr_cached, ==, NULL);
+	ASSERT0P(zp->z_dirlocks);
+	ASSERT0P(zp->z_acl_cached);
+	ASSERT0P(zp->z_xattr_cached);
 	zp->z_id = id;
 	zp->z_unlinked = B_FALSE;
 	zp->z_atime_dirty = B_FALSE;

module/os/linux/zfs/zfs_vfsops.c

@@ -883,7 +883,7 @@ zfsvfs_setup(zfsvfs_t *zfsvfs, boolean_t mounting)
 	 * operations out since we closed the ZIL.
 	 */
 	if (mounting) {
-		ASSERT3P(zfsvfs->z_kstat.dk_kstats, ==, NULL);
+		ASSERT0P(zfsvfs->z_kstat.dk_kstats);
 		error = dataset_kstats_create(&zfsvfs->z_kstat, zfsvfs->z_os);
 		if (error)
 			return (error);

module/os/linux/zfs/zfs_vnops_os.c

@@ -3157,7 +3157,7 @@ top:
 		 * zfs_link_create() to add back the same entry, but with a new
 		 * dnode (szp), should not fail.
 		 */
-		ASSERT3P(tzp, ==, NULL);
+		ASSERT0P(tzp);
 		goto commit_link_tzp;
 	}
 

module/os/linux/zfs/zfs_znode_os.c

@@ -144,9 +144,9 @@ zfs_znode_cache_destructor(void *buf, void *arg)
 	rw_destroy(&zp->z_xattr_lock);
 	zfs_rangelock_fini(&zp->z_rangelock);
 
-	ASSERT3P(zp->z_dirlocks, ==, NULL);
-	ASSERT3P(zp->z_acl_cached, ==, NULL);
-	ASSERT3P(zp->z_xattr_cached, ==, NULL);
+	ASSERT0P(zp->z_dirlocks);
+	ASSERT0P(zp->z_acl_cached);
+	ASSERT0P(zp->z_xattr_cached);
 }
 
 static int
@@ -531,8 +531,8 @@ zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz,
 
 	zp = ITOZ(ip);
 	ASSERT0P(zp->z_dirlocks);
-	ASSERT3P(zp->z_acl_cached, ==, NULL);
-	ASSERT3P(zp->z_xattr_cached, ==, NULL);
+	ASSERT0P(zp->z_acl_cached);
+	ASSERT0P(zp->z_xattr_cached);
 	zp->z_unlinked = B_FALSE;
 	zp->z_atime_dirty = B_FALSE;
 	zp->z_is_ctldir = B_FALSE;

module/os/linux/zfs/zpl_xattr.c

@@ -1494,7 +1494,7 @@ zpl_posix_acl_free(void *arg)
 				acl_rel_head = NULL;
 				if (cmpxchg(&acl_rel_tail, &a->next,
 				    &acl_rel_head) == &a->next) {
-					ASSERT3P(a->next, ==, NULL);
+					ASSERT0P(a->next);
 					a->next = freelist;
 					freelist = a;
 					break;
@@ -1544,7 +1544,7 @@ zpl_posix_acl_release_impl(struct posix_acl *acl)
 	a->time = ddi_get_lbolt();
 	/* atomically points tail to us and get the previous tail */
 	prev = xchg(&acl_rel_tail, &a->next);
-	ASSERT3P(*prev, ==, NULL);
+	ASSERT0P(*prev);
 	*prev = a;
 	/* if it was empty before, schedule the free task */
 	if (prev == &acl_rel_head)

module/os/linux/zfs/zvol_os.c

@@ -1426,7 +1426,7 @@ zvol_os_free(zvol_state_t *zv)
 	ASSERT(!RW_LOCK_HELD(&zv->zv_suspend_lock));
 	ASSERT(!MUTEX_HELD(&zv->zv_state_lock));
 	ASSERT0(zv->zv_open_count);
-	ASSERT3P(zv->zv_zso->zvo_disk->private_data, ==, NULL);
+	ASSERT0P(zv->zv_zso->zvo_disk->private_data);
 
 	rw_destroy(&zv->zv_suspend_lock);
 	zfs_rangelock_fini(&zv->zv_rangelock);
@@ -1649,11 +1649,11 @@ zvol_os_create_minor(const char *name)
 	blk_queue_flag_set(QUEUE_FLAG_SCSI_PASSTHROUGH, zv->zv_zso->zvo_queue);
 #endif
 
-	ASSERT3P(zv->zv_kstat.dk_kstats, ==, NULL);
+	ASSERT0P(zv->zv_kstat.dk_kstats);
 	error = dataset_kstats_create(&zv->zv_kstat, zv->zv_objset);
 	if (error)
 		goto out_dmu_objset_disown;
-	ASSERT3P(zv->zv_zilog, ==, NULL);
+	ASSERT0P(zv->zv_zilog);
 	zv->zv_zilog = zil_open(os, zvol_get_data, &zv->zv_kstat.dk_zil_sums);
 	if (spa_writeable(dmu_objset_spa(os))) {
 		if (zil_replay_disable)