diff --git a/cmd/zfs/zfs_main.c b/cmd/zfs/zfs_main.c
index 5be1263e9..22426ebfd 100644
--- a/cmd/zfs/zfs_main.c
+++ b/cmd/zfs/zfs_main.c
@@ -764,7 +764,7 @@ zfs_do_create(int argc, char **argv)
 		zfs_prop_t resv_prop;
 		char *strval;
 
-		if (p = strchr(argv[0], '/'))
+		if ((p = strchr(argv[0], '/')))
 			*p = '\0';
 		zpool_handle = zpool_open(g_zfs, argv[0]);
 		if (p != NULL)
@@ -4035,7 +4035,7 @@ zfs_do_diff(int argc, char **argv)
 	if (copy == NULL)
 		usage(B_FALSE);
 
-	if (atp = strchr(copy, '@'))
+	if ((atp = strchr(copy, '@')))
 		*atp = '\0';
 
 	if ((zhp = zfs_open(g_zfs, copy, ZFS_TYPE_FILESYSTEM)) == NULL)
diff --git a/cmd/zpool/zpool_iter.c b/cmd/zpool/zpool_iter.c
index bf947d307..952d19172 100644
--- a/cmd/zpool/zpool_iter.c
+++ b/cmd/zpool/zpool_iter.c
@@ -131,7 +131,7 @@ pool_list_get(int argc, char **argv, zprop_list_t **proplist, int *err)
 		for (i = 0; i < argc; i++) {
 			zpool_handle_t *zhp;
 
-			if (zhp = zpool_open_canfail(g_zfs, argv[i])) {
+			if ((zhp = zpool_open_canfail(g_zfs, argv[i]))) {
 				if (add_pool(zhp, zlp) != 0)
 					*err = B_TRUE;
 			} else {
diff --git a/lib/libzfs/libzfs_dataset.c b/lib/libzfs/libzfs_dataset.c
index e2c4c1e16..32cdd636a 100644
--- a/lib/libzfs/libzfs_dataset.c
+++ b/lib/libzfs/libzfs_dataset.c
@@ -623,7 +623,7 @@ libzfs_mnttab_fini(libzfs_handle_t *hdl)
 	void *cookie = NULL;
 	mnttab_node_t *mtn;
 
-	while (mtn = avl_destroy_nodes(&hdl->libzfs_mnttab_cache, &cookie)) {
+	while ((mtn = avl_destroy_nodes(&hdl->libzfs_mnttab_cache, &cookie))) {
 		free(mtn->mtn_mt.mnt_special);
 		free(mtn->mtn_mt.mnt_mountp);
 		free(mtn->mtn_mt.mnt_fstype);
@@ -695,7 +695,7 @@ libzfs_mnttab_remove(libzfs_handle_t *hdl, const char *fsname)
 	mnttab_node_t *ret;
 
 	find.mtn_mt.mnt_special = (char *)fsname;
-	if (ret = avl_find(&hdl->libzfs_mnttab_cache, (void *)&find, NULL)) {
+	if ((ret = avl_find(&hdl->libzfs_mnttab_cache, (void *)&find, NULL))) {
 		avl_remove(&hdl->libzfs_mnttab_cache, ret);
 		free(ret->mtn_mt.mnt_special);
 		free(ret->mtn_mt.mnt_mountp);
@@ -2734,7 +2734,7 @@ create_parents(libzfs_handle_t *hdl, char *target, int prefixlen)
 	 * up to the prefixlen-long one.
 	 */
 	for (cp = target + prefixlen + 1;
-	    cp = strchr(cp, '/'); *cp = '/', cp++) {
+	    (cp = strchr(cp, '/')); *cp = '/', cp++) {
 		char *logstr;
 
 		*cp = '\0';
diff --git a/lib/libzfs/libzfs_diff.c b/lib/libzfs/libzfs_diff.c
index 9ef6fdcfb..5b3f93465 100644
--- a/lib/libzfs/libzfs_diff.c
+++ b/lib/libzfs/libzfs_diff.c
@@ -346,7 +346,7 @@ write_inuse_diffs(FILE *fp, differ_info_t *di, dmu_diff_record_t *dr)
 	int err;
 
 	for (o = dr->ddr_first; o <= dr->ddr_last; o++) {
-		if (err = write_inuse_diffs_one(fp, di, o))
+		if ((err = write_inuse_diffs_one(fp, di, o)))
 			return (err);
 	}
 	return (0);
diff --git a/lib/libzfs/libzfs_sendrecv.c b/lib/libzfs/libzfs_sendrecv.c
index c1d3b5632..c6d684c4c 100644
--- a/lib/libzfs/libzfs_sendrecv.c
+++ b/lib/libzfs/libzfs_sendrecv.c
@@ -1297,7 +1297,7 @@ zfs_send(zfs_handle_t *zhp, const char *fromsnap, const char *tosnap,
 	if (flags.dedup) {
 		featureflags |= (DMU_BACKUP_FEATURE_DEDUP |
 		    DMU_BACKUP_FEATURE_DEDUPPROPS);
-		if (err = pipe(pipefd)) {
+		if ((err = pipe(pipefd))) {
 			zfs_error_aux(zhp->zfs_hdl, strerror(errno));
 			return (zfs_error(zhp->zfs_hdl, EZFS_PIPEFAILED,
 			    errbuf));
@@ -1305,7 +1305,7 @@ zfs_send(zfs_handle_t *zhp, const char *fromsnap, const char *tosnap,
 		dda.outputfd = outfd;
 		dda.inputfd = pipefd[1];
 		dda.dedup_hdl = zhp->zfs_hdl;
-		if (err = pthread_create(&tid, NULL, cksummer, &dda)) {
+		if ((err = pthread_create(&tid, NULL, cksummer, &dda))) {
 			(void) close(pipefd[0]);
 			(void) close(pipefd[1]);
 			zfs_error_aux(zhp->zfs_hdl, strerror(errno));
diff --git a/module/nvpair/nvpair.c b/module/nvpair/nvpair.c
index 00d44263c..c675684c8 100644
--- a/module/nvpair/nvpair.c
+++ b/module/nvpair/nvpair.c
@@ -2382,7 +2382,7 @@ nvlist_xpack(nvlist_t *nvl, char **bufp, size_t *buflen, int encoding,
 	 */
 	nv_priv_init(&nvpriv, nva, 0);
 
-	if (err = nvlist_size(nvl, &alloc_size, encoding))
+	if ((err = nvlist_size(nvl, &alloc_size, encoding)))
 		return (err);
 
 	if ((buf = nv_mem_zalloc(&nvpriv, alloc_size)) == NULL)
diff --git a/module/unicode/u8_textprep.c b/module/unicode/u8_textprep.c
index 34b0b9a8b..2532769c8 100644
--- a/module/unicode/u8_textprep.c
+++ b/module/unicode/u8_textprep.c
@@ -144,9 +144,10 @@
 #define	U8_16BIT_TABLE_INDICATOR	(0x8000U)
 
 /* The following are some convenience macros. */
-#define	U8_PUT_3BYTES_INTO_UTF32(u, b1, b2, b3) \
-	(u) = ((uint32_t)(b1) & 0x0F) << 12 | ((uint32_t)(b2) & 0x3F) << 6 | \
-		(uint32_t)(b3) & 0x3F;
+#define	U8_PUT_3BYTES_INTO_UTF32(u, b1, b2, b3)  \
+	(u) = ((((uint32_t)(b1) & 0x0F) << 12) | \
+	       (((uint32_t)(b2) & 0x3F) << 6)  | \
+		((uint32_t)(b3) & 0x3F));
 
 #define	U8_SIMPLE_SWAP(a, b, t) \
 	(t) = (a); \
diff --git a/module/zcommon/zfs_deleg.c b/module/zcommon/zfs_deleg.c
index 83d9edb21..a4aa77adb 100644
--- a/module/zcommon/zfs_deleg.c
+++ b/module/zcommon/zfs_deleg.c
@@ -182,8 +182,8 @@ zfs_deleg_verify_nvlist(nvlist_t *nvp)
 			    nvpair_name(perm_name));
 			if (error)
 				return (-1);
-		} while (perm_name = nvlist_next_nvpair(perms, perm_name));
-	} while (who = nvlist_next_nvpair(nvp, who));
+		} while ((perm_name = nvlist_next_nvpair(perms, perm_name)));
+	} while ((who = nvlist_next_nvpair(nvp, who)));
 	return (0);
 }
 
diff --git a/module/zfs/arc.c b/module/zfs/arc.c
index d38d9a367..c1b867174 100644
--- a/module/zfs/arc.c
+++ b/module/zfs/arc.c
@@ -3414,7 +3414,7 @@ arc_tempreserve_space(uint64_t reserve, uint64_t txg)
 	 * in order to compress/encrypt/etc the data.  We therefor need to
 	 * make sure that there is sufficient available memory for this.
 	 */
-	if (error = arc_memory_throttle(reserve, anon_size, txg))
+	if ((error = arc_memory_throttle(reserve, anon_size, txg)))
 		return (error);
 
 	/*
diff --git a/module/zfs/bplist.c b/module/zfs/bplist.c
index 066ccc6b1..5d1cf7e76 100644
--- a/module/zfs/bplist.c
+++ b/module/zfs/bplist.c
@@ -58,7 +58,7 @@ bplist_iterate(bplist_t *bpl, bplist_itor_t *func, void *arg, dmu_tx_t *tx)
 	bplist_entry_t *bpe;
 
 	mutex_enter(&bpl->bpl_lock);
-	while (bpe = list_head(&bpl->bpl_list)) {
+	while ((bpe = list_head(&bpl->bpl_list))) {
 		list_remove(&bpl->bpl_list, bpe);
 		mutex_exit(&bpl->bpl_lock);
 		func(arg, &bpe->bpe_blk, tx);
diff --git a/module/zfs/dbuf.c b/module/zfs/dbuf.c
index 82cfd1a2e..8fcc1b23d 100644
--- a/module/zfs/dbuf.c
+++ b/module/zfs/dbuf.c
@@ -1810,7 +1810,7 @@ dbuf_prefetch(dnode_t *dn, uint64_t blkid)
 		return;
 
 	/* dbuf_find() returns with db_mtx held */
-	if (db = dbuf_find(dn, 0, blkid)) {
+	if ((db = dbuf_find(dn, 0, blkid))) {
 		/*
 		 * This dbuf is already in the cache.  We assume that
 		 * it is already CACHED, or else about to be either
@@ -2395,7 +2395,7 @@ dbuf_sync_list(list_t *list, dmu_tx_t *tx)
 {
 	dbuf_dirty_record_t *dr;
 
-	while (dr = list_head(list)) {
+	while ((dr = list_head(list))) {
 		if (dr->dr_zio != NULL) {
 			/*
 			 * If we find an already initialized zio then we
diff --git a/module/zfs/dmu_objset.c b/module/zfs/dmu_objset.c
index bacd62c09..b3a830217 100644
--- a/module/zfs/dmu_objset.c
+++ b/module/zfs/dmu_objset.c
@@ -1016,7 +1016,7 @@ dmu_objset_sync_dnodes(list_t *list, list_t *newlist, dmu_tx_t *tx)
 {
 	dnode_t *dn;
 
-	while (dn = list_head(list)) {
+	while ((dn = list_head(list))) {
 		ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT);
 		ASSERT(dn->dn_dbuf->db_data_pending);
 		/*
@@ -1157,7 +1157,7 @@ dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx)
 	dmu_objset_sync_dnodes(&os->os_dirty_dnodes[txgoff], newlist, tx);
 
 	list = &DMU_META_DNODE(os)->dn_dirty_records[txgoff];
-	while (dr = list_head(list)) {
+	while ((dr = list_head(list)) != NULL) {
 		ASSERT(dr->dr_dbuf->db_level == 0);
 		list_remove(list, dr);
 		if (dr->dr_zio)
@@ -1228,7 +1228,7 @@ dmu_objset_do_userquota_updates(objset_t *os, dmu_tx_t *tx)
 
 	ASSERT(list_head(list) == NULL || dmu_objset_userused_enabled(os));
 
-	while (dn = list_head(list)) {
+	while ((dn = list_head(list)) != NULL) {
 		int flags;
 		ASSERT(!DMU_OBJECT_IS_SPECIAL(dn->dn_object));
 		ASSERT(dn->dn_phys->dn_type == DMU_OT_NONE ||
diff --git a/module/zfs/dmu_send.c b/module/zfs/dmu_send.c
index 3ddea95d0..dc93dea85 100644
--- a/module/zfs/dmu_send.c
+++ b/module/zfs/dmu_send.c
@@ -1201,8 +1201,9 @@ restore_write_byref(struct restorearg *ra, objset_t *os,
 		ref_os = os;
 	}
 
-	if (err = dmu_buf_hold(ref_os, drrwbr->drr_refobject,
-	    drrwbr->drr_refoffset, FTAG, &dbp, DMU_READ_PREFETCH))
+	err = dmu_buf_hold(ref_os, drrwbr->drr_refobject,
+	    drrwbr->drr_refoffset, FTAG, &dbp, DMU_READ_PREFETCH);
+	if (err)
 		return (err);
 
 	tx = dmu_tx_create(os);
diff --git a/module/zfs/dmu_tx.c b/module/zfs/dmu_tx.c
index d292438dc..91dc01e91 100644
--- a/module/zfs/dmu_tx.c
+++ b/module/zfs/dmu_tx.c
@@ -1125,7 +1125,7 @@ dmu_tx_commit(dmu_tx_t *tx)
 
 	ASSERT(tx->tx_txg != 0);
 
-	while (txh = list_head(&tx->tx_holds)) {
+	while ((txh = list_head(&tx->tx_holds))) {
 		dnode_t *dn = txh->txh_dnode;
 
 		list_remove(&tx->tx_holds, txh);
@@ -1173,7 +1173,7 @@ dmu_tx_abort(dmu_tx_t *tx)
 
 	ASSERT(tx->tx_txg == 0);
 
-	while (txh = list_head(&tx->tx_holds)) {
+	while ((txh = list_head(&tx->tx_holds))) {
 		dnode_t *dn = txh->txh_dnode;
 
 		list_remove(&tx->tx_holds, txh);
@@ -1227,7 +1227,7 @@ dmu_tx_do_callbacks(list_t *cb_list, int error)
 {
 	dmu_tx_callback_t *dcb;
 
-	while (dcb = list_head(cb_list)) {
+	while ((dcb = list_head(cb_list))) {
 		list_remove(cb_list, dcb);
 		dcb->dcb_func(dcb->dcb_data, error);
 		kmem_free(dcb, sizeof (dmu_tx_callback_t));
diff --git a/module/zfs/dmu_zfetch.c b/module/zfs/dmu_zfetch.c
index 37037c30f..4a1b1f4a7 100644
--- a/module/zfs/dmu_zfetch.c
+++ b/module/zfs/dmu_zfetch.c
@@ -665,7 +665,7 @@ dmu_zfetch(zfetch_t *zf, uint64_t offset, uint64_t size, int prefetched)
 		ZFETCHSTAT_BUMP(zfetchstat_hits);
 	} else {
 		ZFETCHSTAT_BUMP(zfetchstat_misses);
-		if (fetched = dmu_zfetch_colinear(zf, &zst)) {
+		if ((fetched = dmu_zfetch_colinear(zf, &zst))) {
 			ZFETCHSTAT_BUMP(zfetchstat_colinear_hits);
 		} else {
 			ZFETCHSTAT_BUMP(zfetchstat_colinear_misses);
diff --git a/module/zfs/dnode.c b/module/zfs/dnode.c
index 535f5408f..f26aef22c 100644
--- a/module/zfs/dnode.c
+++ b/module/zfs/dnode.c
@@ -1079,8 +1079,8 @@ dnode_hold_impl(objset_t *os, uint64_t object, int flag,
 			zrl_init(&dnh[i].dnh_zrlock);
 			dnh[i].dnh_dnode = NULL;
 		}
-		if (winner = dmu_buf_set_user(&db->db, children_dnodes, NULL,
-		    dnode_buf_pageout)) {
+		if ((winner = dmu_buf_set_user(&db->db, children_dnodes, NULL,
+		    dnode_buf_pageout))) {
 			kmem_free(children_dnodes, sizeof (dnode_children_t) +
 			    (epb - 1) * sizeof (dnode_handle_t));
 			children_dnodes = winner;
@@ -1625,7 +1625,7 @@ dnode_free_range(dnode_t *dn, uint64_t off, uint64_t len, dmu_tx_t *tx)
 		int shift = epbs + dn->dn_datablkshift;
 
 		first = blkid >> epbs;
-		if (db = dbuf_hold_level(dn, 1, first, FTAG)) {
+		if ((db = dbuf_hold_level(dn, 1, first, FTAG))) {
 			dbuf_will_dirty(db, tx);
 			dbuf_rele(db, FTAG);
 		}
diff --git a/module/zfs/dnode_sync.c b/module/zfs/dnode_sync.c
index 2ee990a3b..0b5535db6 100644
--- a/module/zfs/dnode_sync.c
+++ b/module/zfs/dnode_sync.c
@@ -435,7 +435,7 @@ dnode_undirty_dbufs(list_t *list)
 {
 	dbuf_dirty_record_t *dr;
 
-	while (dr = list_head(list)) {
+	while ((dr = list_head(list))) {
 		dmu_buf_impl_t *db = dr->dr_dbuf;
 		uint64_t txg = dr->dr_txg;
 
@@ -635,7 +635,7 @@ dnode_sync(dnode_t *dn, dmu_tx_t *tx)
 	}
 
 	/* process all the "freed" ranges in the file */
-	while (rp = avl_last(&dn->dn_ranges[txgoff])) {
+	while ((rp = avl_last(&dn->dn_ranges[txgoff]))) {
 		dnode_sync_free_range(dn, rp->fr_blkid, rp->fr_nblks, tx);
 		/* grab the mutex so we don't race with dnode_block_freed() */
 		mutex_enter(&dn->dn_mtx);
diff --git a/module/zfs/dsl_deleg.c b/module/zfs/dsl_deleg.c
index 529fb052f..4d7ec80a1 100644
--- a/module/zfs/dsl_deleg.c
+++ b/module/zfs/dsl_deleg.c
@@ -96,13 +96,13 @@ dsl_deleg_can_allow(char *ddname, nvlist_t *nvp, cred_t *cr)
 	if ((error = dsl_deleg_access(ddname, ZFS_DELEG_PERM_ALLOW, cr)) != 0)
 		return (error);
 
-	while (whopair = nvlist_next_nvpair(nvp, whopair)) {
+	while ((whopair = nvlist_next_nvpair(nvp, whopair))) {
 		nvlist_t *perms;
 		nvpair_t *permpair = NULL;
 
 		VERIFY(nvpair_value_nvlist(whopair, &perms) == 0);
 
-		while (permpair = nvlist_next_nvpair(perms, permpair)) {
+		while ((permpair = nvlist_next_nvpair(perms, permpair))) {
 			const char *perm = nvpair_name(permpair);
 
 			if (strcmp(perm, ZFS_DELEG_PERM_ALLOW) == 0)
@@ -133,7 +133,7 @@ dsl_deleg_can_unallow(char *ddname, nvlist_t *nvp, cred_t *cr)
 	(void) snprintf(idstr, sizeof (idstr), "%lld",
 	    (longlong_t)crgetuid(cr));
 
-	while (whopair = nvlist_next_nvpair(nvp, whopair)) {
+	while ((whopair = nvlist_next_nvpair(nvp, whopair))) {
 		zfs_deleg_who_type_t type = nvpair_name(whopair)[0];
 
 		if (type != ZFS_DELEG_USER &&
@@ -161,7 +161,7 @@ dsl_deleg_set_sync(void *arg1, void *arg2, dmu_tx_t *tx)
 		    DMU_OT_DSL_PERMS, DMU_OT_NONE, 0, tx);
 	}
 
-	while (whopair = nvlist_next_nvpair(nvp, whopair)) {
+	while ((whopair = nvlist_next_nvpair(nvp, whopair))) {
 		const char *whokey = nvpair_name(whopair);
 		nvlist_t *perms;
 		nvpair_t *permpair = NULL;
@@ -176,7 +176,7 @@ dsl_deleg_set_sync(void *arg1, void *arg2, dmu_tx_t *tx)
 			    whokey, 8, 1, &jumpobj, tx) == 0);
 		}
 
-		while (permpair = nvlist_next_nvpair(perms, permpair)) {
+		while ((permpair = nvlist_next_nvpair(perms, permpair))) {
 			const char *perm = nvpair_name(permpair);
 			uint64_t n = 0;
 
@@ -202,7 +202,7 @@ dsl_deleg_unset_sync(void *arg1, void *arg2, dmu_tx_t *tx)
 	if (zapobj == 0)
 		return;
 
-	while (whopair = nvlist_next_nvpair(nvp, whopair)) {
+	while ((whopair = nvlist_next_nvpair(nvp, whopair))) {
 		const char *whokey = nvpair_name(whopair);
 		nvlist_t *perms;
 		nvpair_t *permpair = NULL;
@@ -224,7 +224,7 @@ dsl_deleg_unset_sync(void *arg1, void *arg2, dmu_tx_t *tx)
 		if (zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj) != 0)
 			continue;
 
-		while (permpair = nvlist_next_nvpair(perms, permpair)) {
+		while ((permpair = nvlist_next_nvpair(perms, permpair))) {
 			const char *perm = nvpair_name(permpair);
 			uint64_t n = 0;
 
@@ -261,7 +261,7 @@ dsl_deleg_set(const char *ddname, nvlist_t *nvp, boolean_t unset)
 		return (ENOTSUP);
 	}
 
-	while (whopair = nvlist_next_nvpair(nvp, whopair))
+	while ((whopair = nvlist_next_nvpair(nvp, whopair)))
 		blocks_modified++;
 
 	error = dsl_sync_task_do(dd->dd_pool, NULL,
diff --git a/module/zfs/dsl_dir.c b/module/zfs/dsl_dir.c
index 545dce9a0..2e52f9c73 100644
--- a/module/zfs/dsl_dir.c
+++ b/module/zfs/dsl_dir.c
@@ -881,7 +881,7 @@ dsl_dir_tempreserve_clear(void *tr_cookie, dmu_tx_t *tx)
 	if (tr_cookie == NULL)
 		return;
 
-	while (tr = list_head(tr_list)) {
+	while ((tr = list_head(tr_list))) {
 		if (tr->tr_dp) {
 			dsl_pool_tempreserve_clear(tr->tr_dp, tr->tr_size, tx);
 		} else if (tr->tr_ds) {
@@ -1285,8 +1285,8 @@ dsl_dir_rename_check(void *arg1, void *arg2, dmu_tx_t *tx)
 		if (closest_common_ancestor(dd, ra->newparent) == dd)
 			return (EINVAL);
 
-		if (err = dsl_dir_transfer_possible(dd->dd_parent,
-		    ra->newparent, myspace))
+		if ((err = dsl_dir_transfer_possible(dd->dd_parent,
+		    ra->newparent, myspace)))
 			return (err);
 	}
 
diff --git a/module/zfs/dsl_pool.c b/module/zfs/dsl_pool.c
index a3c1457df..6a0e3632c 100644
--- a/module/zfs/dsl_pool.c
+++ b/module/zfs/dsl_pool.c
@@ -322,7 +322,7 @@ dsl_pool_sync(dsl_pool_t *dp, uint64_t txg)
 	start = gethrtime();
 
 	zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
-	while (ds = txg_list_remove(&dp->dp_dirty_datasets, txg)) {
+	while ((ds = txg_list_remove(&dp->dp_dirty_datasets, txg))) {
 		/*
 		 * We must not sync any non-MOS datasets twice, because
 		 * we may have taken a snapshot of them.  However, we
@@ -350,7 +350,7 @@ dsl_pool_sync(dsl_pool_t *dp, uint64_t txg)
 	 * whose ds_bp will be rewritten when we do this 2nd sync.
 	 */
 	zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
-	while (ds = txg_list_remove(&dp->dp_dirty_datasets, txg)) {
+	while ((ds = txg_list_remove(&dp->dp_dirty_datasets, txg))) {
 		ASSERT(list_link_active(&ds->ds_synced_link));
 		dmu_buf_rele(ds->ds_dbuf, ds);
 		dsl_dataset_sync(ds, zio, tx);
@@ -367,7 +367,7 @@ dsl_pool_sync(dsl_pool_t *dp, uint64_t txg)
 		    deadlist_enqueue_cb, &ds->ds_deadlist, tx);
 	}
 
-	while (dstg = txg_list_remove(&dp->dp_sync_tasks, txg)) {
+	while ((dstg = txg_list_remove(&dp->dp_sync_tasks, txg))) {
 		/*
 		 * No more sync tasks should have been added while we
 		 * were syncing.
@@ -378,7 +378,7 @@ dsl_pool_sync(dsl_pool_t *dp, uint64_t txg)
 	DTRACE_PROBE(pool_sync__3task);
 
 	start = gethrtime();
-	while (dd = txg_list_remove(&dp->dp_dirty_dirs, txg))
+	while ((dd = txg_list_remove(&dp->dp_dirty_dirs, txg)))
 		dsl_dir_sync(dd, tx);
 	write_time += gethrtime() - start;
 
@@ -448,7 +448,7 @@ dsl_pool_sync_done(dsl_pool_t *dp, uint64_t txg)
 	dsl_dataset_t *ds;
 	objset_t *os;
 
-	while (ds = list_head(&dp->dp_synced_datasets)) {
+	while ((ds = list_head(&dp->dp_synced_datasets))) {
 		list_remove(&dp->dp_synced_datasets, ds);
 		os = ds->ds_objset;
 		zil_clean(os->os_zil, txg);
diff --git a/module/zfs/dsl_prop.c b/module/zfs/dsl_prop.c
index 6492701c5..af99d7415 100644
--- a/module/zfs/dsl_prop.c
+++ b/module/zfs/dsl_prop.c
@@ -830,7 +830,7 @@ dsl_props_set(const char *dsname, zprop_source_t source, nvlist_t *props)
 	dsl_props_arg_t pa;
 	int err;
 
-	if (err = dsl_dataset_hold(dsname, FTAG, &ds))
+	if ((err = dsl_dataset_hold(dsname, FTAG, &ds)))
 		return (err);
 	/*
 	 * Do these checks before the syncfunc, since it can't fail.
diff --git a/module/zfs/dsl_synctask.c b/module/zfs/dsl_synctask.c
index b0818ce27..977702912 100644
--- a/module/zfs/dsl_synctask.c
+++ b/module/zfs/dsl_synctask.c
@@ -147,7 +147,7 @@ dsl_sync_task_group_destroy(dsl_sync_task_group_t *dstg)
 {
 	dsl_sync_task_t *dst;
 
-	while (dst = list_head(&dstg->dstg_tasks)) {
+	while ((dst = list_head(&dstg->dstg_tasks))) {
 		list_remove(&dstg->dstg_tasks, dst);
 		kmem_free(dst, sizeof (dsl_sync_task_t));
 	}
diff --git a/module/zfs/refcount.c b/module/zfs/refcount.c
index 600132f08..a659c0742 100644
--- a/module/zfs/refcount.c
+++ b/module/zfs/refcount.c
@@ -72,13 +72,13 @@ refcount_destroy_many(refcount_t *rc, uint64_t number)
 	reference_t *ref;
 
 	ASSERT(rc->rc_count == number);
-	while (ref = list_head(&rc->rc_list)) {
+	while ((ref = list_head(&rc->rc_list))) {
 		list_remove(&rc->rc_list, ref);
 		kmem_cache_free(reference_cache, ref);
 	}
 	list_destroy(&rc->rc_list);
 
-	while (ref = list_head(&rc->rc_removed)) {
+	while ((ref = list_head(&rc->rc_removed))) {
 		list_remove(&rc->rc_removed, ref);
 		kmem_cache_free(reference_history_cache, ref->ref_removed);
 		kmem_cache_free(reference_cache, ref);
diff --git a/module/zfs/sa.c b/module/zfs/sa.c
index b6e61bec0..f94b6ac38 100644
--- a/module/zfs/sa.c
+++ b/module/zfs/sa.c
@@ -1105,16 +1105,16 @@ sa_tear_down(objset_t *os)
 	sa_free_attr_table(sa);
 
 	cookie = NULL;
-	while (layout = avl_destroy_nodes(&sa->sa_layout_hash_tree, &cookie)) {
+	while ((layout = avl_destroy_nodes(&sa->sa_layout_hash_tree, &cookie))){
 		sa_idx_tab_t *tab;
-		while (tab = list_head(&layout->lot_idx_tab)) {
+		while ((tab = list_head(&layout->lot_idx_tab))) {
 			ASSERT(refcount_count(&tab->sa_refcount));
 			sa_idx_tab_rele(os, tab);
 		}
 	}
 
 	cookie = NULL;
-	while (layout = avl_destroy_nodes(&sa->sa_layout_num_tree, &cookie)) {
+	while ((layout = avl_destroy_nodes(&sa->sa_layout_num_tree, &cookie))){
 		kmem_free(layout->lot_attrs,
 		    sizeof (sa_attr_type_t) * layout->lot_attr_count);
 		kmem_free(layout, sizeof (sa_lot_t));
@@ -1387,7 +1387,7 @@ sa_handle_get(objset_t *objset, uint64_t objid, void *userp,
 	dmu_buf_t *db;
 	int error;
 
-	if (error = dmu_bonus_hold(objset, objid, NULL, &db))
+	if ((error = dmu_bonus_hold(objset, objid, NULL, &db)))
 		return (error);
 
 	return (sa_handle_get_from_db(objset, db, userp, hdl_type,
diff --git a/module/zfs/spa.c b/module/zfs/spa.c
index 64f5e067c..b397a19b3 100644
--- a/module/zfs/spa.c
+++ b/module/zfs/spa.c
@@ -271,8 +271,8 @@ spa_prop_get(spa_t *spa, nvlist_t **nvp)
 
 				dp = spa_get_dsl(spa);
 				rw_enter(&dp->dp_config_rwlock, RW_READER);
-				if (err = dsl_dataset_hold_obj(dp,
-				    za.za_first_integer, FTAG, &ds)) {
+				if ((err = dsl_dataset_hold_obj(dp,
+				    za.za_first_integer, FTAG, &ds))) {
 					rw_exit(&dp->dp_config_rwlock);
 					break;
 				}
@@ -398,7 +398,7 @@ spa_prop_validate(spa_t *spa, nvlist_t *props)
 					break;
 				}
 
-				if (error = dmu_objset_hold(strval, FTAG, &os))
+				if ((error = dmu_objset_hold(strval,FTAG,&os)))
 					break;
 
 				/* Must be ZPL and not gzip compressed. */
@@ -2171,7 +2171,7 @@ spa_load_impl(spa_t *spa, uint64_t pool_guid, nvlist_t *config,
 	 * to start pushing transactions.
 	 */
 	if (state != SPA_LOAD_TRYIMPORT) {
-		if (error = spa_load_verify(spa))
+		if ((error = spa_load_verify(spa)))
 			return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA,
 			    error));
 	}
@@ -5596,7 +5596,7 @@ spa_sync(spa_t *spa, uint64_t txg)
 		ddt_sync(spa, txg);
 		dsl_scan_sync(dp, tx);
 
-		while (vd = txg_list_remove(&spa->spa_vdev_txg_list, txg))
+		while ((vd = txg_list_remove(&spa->spa_vdev_txg_list, txg)))
 			vdev_sync(vd, txg);
 
 		if (pass == 1)
@@ -5678,7 +5678,7 @@ spa_sync(spa_t *spa, uint64_t txg)
 	/*
 	 * Update usable space statistics.
 	 */
-	while (vd = txg_list_remove(&spa->spa_vdev_txg_list, TXG_CLEAN(txg)))
+	while ((vd = txg_list_remove(&spa->spa_vdev_txg_list, TXG_CLEAN(txg))))
 		vdev_sync_done(vd, txg);
 
 	spa_update_dspace(spa);
diff --git a/module/zfs/vdev.c b/module/zfs/vdev.c
index 604a673f9..234933d2c 100644
--- a/module/zfs/vdev.c
+++ b/module/zfs/vdev.c
@@ -2034,7 +2034,7 @@ vdev_sync_done(vdev_t *vd, uint64_t txg)
 
 	ASSERT(!vd->vdev_ishole);
 
-	while (msp = txg_list_remove(&vd->vdev_ms_list, TXG_CLEAN(txg)))
+	while ((msp = txg_list_remove(&vd->vdev_ms_list, TXG_CLEAN(txg))))
 		metaslab_sync_done(msp, txg);
 
 	if (reassess)
diff --git a/module/zfs/zap_micro.c b/module/zfs/zap_micro.c
index 2d89c20c4..cc061eec8 100644
--- a/module/zfs/zap_micro.c
+++ b/module/zfs/zap_micro.c
@@ -350,7 +350,7 @@ mze_destroy(zap_t *zap)
 	mzap_ent_t *mze;
 	void *avlcookie = NULL;
 
-	while (mze = avl_destroy_nodes(&zap->zap_m.zap_avl, &avlcookie))
+	while ((mze = avl_destroy_nodes(&zap->zap_m.zap_avl, &avlcookie)))
 		kmem_free(mze, sizeof (mzap_ent_t));
 	avl_destroy(&zap->zap_m.zap_avl);
 }
diff --git a/module/zfs/zfs_fuid.c b/module/zfs/zfs_fuid.c
index a853f4d73..1773a14a1 100644
--- a/module/zfs/zfs_fuid.c
+++ b/module/zfs/zfs_fuid.c
@@ -168,12 +168,12 @@ zfs_fuid_table_destroy(avl_tree_t *idx_tree, avl_tree_t *domain_tree)
 	void *cookie;
 
 	cookie = NULL;
-	while (domnode = avl_destroy_nodes(domain_tree, &cookie))
+	while ((domnode = avl_destroy_nodes(domain_tree, &cookie)))
 		ksiddomain_rele(domnode->f_ksid);
 
 	avl_destroy(domain_tree);
 	cookie = NULL;
-	while (domnode = avl_destroy_nodes(idx_tree, &cookie))
+	while ((domnode = avl_destroy_nodes(idx_tree, &cookie)))
 		kmem_free(domnode, sizeof (fuid_domain_t));
 	avl_destroy(idx_tree);
 }
diff --git a/module/zfs/zfs_ioctl.c b/module/zfs/zfs_ioctl.c
index b7f6c1ed7..4e26cae20 100644
--- a/module/zfs/zfs_ioctl.c
+++ b/module/zfs/zfs_ioctl.c
@@ -1164,8 +1164,8 @@ zfs_ioc_pool_create(zfs_cmd_t *zc)
 	nvlist_t *zplprops = NULL;
 	char *buf;
 
-	if (error = get_nvlist(zc->zc_nvlist_conf, zc->zc_nvlist_conf_size,
-	    zc->zc_iflags, &config))
+	if ((error = get_nvlist(zc->zc_nvlist_conf, zc->zc_nvlist_conf_size,
+	    zc->zc_iflags, &config)))
 		return (error);
 
 	if (zc->zc_nvlist_src_size != 0 && (error =
@@ -1454,7 +1454,7 @@ zfs_ioc_dsobj_to_dsname(zfs_cmd_t *zc)
 {
 	int error;
 
-	if (error = dsl_dsobj_to_dsname(zc->zc_name, zc->zc_obj, zc->zc_value))
+	if ((error = dsl_dsobj_to_dsname(zc->zc_name,zc->zc_obj,zc->zc_value)))
 		return (error);
 
 	return (0);
@@ -1670,8 +1670,8 @@ zfs_ioc_vdev_split(zfs_cmd_t *zc)
 	if ((error = spa_open(zc->zc_name, &spa, FTAG)) != 0)
 		return (error);
 
-	if (error = get_nvlist(zc->zc_nvlist_conf, zc->zc_nvlist_conf_size,
-	    zc->zc_iflags, &config)) {
+	if ((error = get_nvlist(zc->zc_nvlist_conf, zc->zc_nvlist_conf_size,
+	    zc->zc_iflags, &config))) {
 		spa_close(spa, FTAG);
 		return (error);
 	}
@@ -1773,7 +1773,7 @@ zfs_ioc_objset_stats(zfs_cmd_t *zc)
 	objset_t *os = NULL;
 	int error;
 
-	if (error = dmu_objset_hold(zc->zc_name, FTAG, &os))
+	if ((error = dmu_objset_hold(zc->zc_name, FTAG, &os)))
 		return (error);
 
 	error = zfs_ioc_objset_stats_impl(zc, os);
@@ -1797,13 +1797,13 @@ zfs_ioc_objset_stats(zfs_cmd_t *zc)
  * local property values.
  */
 static int
-zfs_ioc_objset_recvd_props(zfs_cmd_t *zc)
+zfs_ioc_objset_recvd_props(struct file *filp, zfs_cmd_t *zc)
 {
 	objset_t *os = NULL;
 	int error;
 	nvlist_t *nv;
 
-	if (error = dmu_objset_hold(zc->zc_name, FTAG, &os))
+	if ((error = dmu_objset_hold(zc->zc_name, FTAG, &os)))
 		return (error);
 
 	/*
@@ -1858,7 +1858,7 @@ zfs_ioc_objset_zplprops(zfs_cmd_t *zc)
 	int err;
 
 	/* XXX reading without owning */
-	if (err = dmu_objset_hold(zc->zc_name, FTAG, &os))
+	if ((err = dmu_objset_hold(zc->zc_name, FTAG, &os)))
 		return (err);
 
 	dmu_objset_fast_stat(os, &zc->zc_objset_stats);
@@ -1926,7 +1926,7 @@ zfs_ioc_dataset_list_next(zfs_cmd_t *zc)
 	size_t orig_len = strlen(zc->zc_name);
 
 top:
-	if (error = dmu_objset_hold(zc->zc_name, FTAG, &os)) {
+	if ((error = dmu_objset_hold(zc->zc_name, FTAG, &os))) {
 		if (error == ENOENT)
 			error = ESRCH;
 		return (error);
@@ -2368,8 +2368,8 @@ zfs_check_userprops(char *fsname, nvlist_t *nvl)
 		    nvpair_type(pair) != DATA_TYPE_STRING)
 			return (EINVAL);
 
-		if (error = zfs_secpolicy_write_perms(fsname,
-		    ZFS_DELEG_PERM_USERPROP, CRED()))
+		if ((error = zfs_secpolicy_write_perms(fsname,
+		    ZFS_DELEG_PERM_USERPROP, CRED())))
 			return (error);
 
 		if (strlen(propname) >= ZAP_MAXNAMELEN)
@@ -2552,8 +2552,8 @@ zfs_ioc_pool_set_props(zfs_cmd_t *zc)
 	int error;
 	nvpair_t *pair;
 
-	if (error = get_nvlist(zc->zc_nvlist_src, zc->zc_nvlist_src_size,
-	    zc->zc_iflags, &props))
+	if ((error = get_nvlist(zc->zc_nvlist_src, zc->zc_nvlist_src_size,
+	    zc->zc_iflags, &props)))
 		return (error);
 
 	/*
@@ -3274,8 +3274,8 @@ zfs_check_settable(const char *dsname, nvpair_t *pair, cred_t *cr)
 
 	if (prop == ZPROP_INVAL) {
 		if (zfs_prop_user(propname)) {
-			if (err = zfs_secpolicy_write_perms(dsname,
-			    ZFS_DELEG_PERM_USERPROP, cr))
+			if ((err = zfs_secpolicy_write_perms(dsname,
+			    ZFS_DELEG_PERM_USERPROP, cr)))
 				return (err);
 			return (0);
 		}
@@ -3298,7 +3298,7 @@ zfs_check_settable(const char *dsname, nvpair_t *pair, cred_t *cr)
 				return (EINVAL);
 			}
 
-			if (err = zfs_secpolicy_write_perms(dsname, perm, cr))
+			if ((err = zfs_secpolicy_write_perms(dsname, perm, cr)))
 				return (err);
 			return (0);
 		}
diff --git a/module/zfs/zil.c b/module/zfs/zil.c
index fd4d76821..751806d33 100644
--- a/module/zfs/zil.c
+++ b/module/zfs/zil.c
@@ -1421,7 +1421,7 @@ zil_commit_writer(zilog_t *zilog)
 	}
 
 	DTRACE_PROBE1(zil__cw1, zilog_t *, zilog);
-	while (itx = list_head(&zilog->zl_itx_commit_list)) {
+	while ((itx = list_head(&zilog->zl_itx_commit_list))) {
 		txg = itx->itx_lr.lrc_txg;
 		ASSERT(txg);