diff --git a/config/Rules.am b/config/Rules.am
index 175e4b6087..3c22bb8443 100644
--- a/config/Rules.am
+++ b/config/Rules.am
@@ -1,12 +1,7 @@
 DEFAULT_INCLUDES = -I${top_srcdir}
 
-# FIXME: Quiet warnings not covered by the gcc-* patches.  We should
-# FIXME: consider removing this as soon as we reasonably can.
-#
 # FIXME: Add -Wshadow once everything is working
-#
-AM_CFLAGS  = -Wall -Wstrict-prototypes -Werror
-AM_CFLAGS += -Wno-switch -Wno-unused -Wno-missing-braces
+AM_CFLAGS  = -Wall -Wstrict-prototypes -Werror -Wno-switch
 AM_CFLAGS += -Wno-uninitialized -fno-strict-aliasing
 
 # Expected defines not covered by zfs_config.h or spl_config.h
diff --git a/config/kernel.m4 b/config/kernel.m4
index 245bdc00de..e1cd0b90cf 100644
--- a/config/kernel.m4
+++ b/config/kernel.m4
@@ -6,15 +6,12 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
 	dnl # KERNELMAKE_PARAMS="V=1"	# Enable verbose module build
 	KERNELMAKE_PARAMS=
 
-	# FIXME: Quiet warnings not covered by the gcc-* patches.  We should
-	# FIXME: consider removing this as soon as we reasonably can
 	KERNELCPPFLAGS="$KERNELCPPFLAGS -Wall -Wstrict-prototypes -Werror"
-	KERNELCPPFLAGS="$KERNELCPPFLAGS -Wno-switch -Wno-unused"
-	KERNELCPPFLAGS="$KERNELCPPFLAGS -Wno-missing-braces"
+	KERNELCPPFLAGS="$KERNELCPPFLAGS -Wno-switch"
 	KERNELCPPFLAGS="$KERNELCPPFLAGS -Wno-uninitialized -fno-strict-aliasing"
 
-	KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL "
-	KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\" "
+	KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
+	KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""
 
 	KERNELCPPFLAGS="$KERNELCPPFLAGS -I$splsrc -I$splsrc/include -I$TOPDIR"
 
diff --git a/module/zfs/arc.c b/module/zfs/arc.c
index a8c3389c3a..b7278822bb 100644
--- a/module/zfs/arc.c
+++ b/module/zfs/arc.c
@@ -1854,9 +1854,8 @@ arc_shrink(void)
 static int
 arc_reclaim_needed(void)
 {
-	uint64_t extra;
-
 #ifdef _KERNEL
+	uint64_t extra;
 
 	if (needfree)
 		return (1);
@@ -2515,7 +2514,7 @@ arc_read(zio_t *pio, spa_t *spa, blkptr_t *bp, arc_buf_t *pbuf,
 	err = arc_read_nolock(pio, spa, bp, done, private, priority,
 	    zio_flags, arc_flags, zb);
 
-	ASSERT3P(hdr, ==, pbuf->b_hdr);
+	VERIFY3P(hdr, ==, pbuf->b_hdr);
 	rw_exit(&pbuf->b_lock);
 	return (err);
 }
diff --git a/module/zfs/dbuf.c b/module/zfs/dbuf.c
index ab523d4f68..e6d7400c35 100644
--- a/module/zfs/dbuf.c
+++ b/module/zfs/dbuf.c
@@ -323,12 +323,12 @@ dbuf_verify(dmu_buf_impl_t *db)
 	 * dnode_set_blksz().
 	 */
 	if (db->db_level == 0 && db->db.db_object == DMU_META_DNODE_OBJECT) {
-		dbuf_dirty_record_t *dr = db->db_data_pending;
 		/*
 		 * It should only be modified in syncing context, so
 		 * make sure we only have one copy of the data.
 		 */
-		ASSERT(dr == NULL || dr->dt.dl.dr_data == db->db_buf);
+		ASSERT(db->db_data_pending == NULL ||
+		       db->db_data_pending->dt.dl.dr_data == db->db_buf);
 	}
 
 	/* verify db->db_blkptr */
@@ -344,7 +344,6 @@ dbuf_verify(dmu_buf_impl_t *db)
 			    &dn->dn_phys->dn_blkptr[db->db_blkid]);
 		} else {
 			/* db is pointed to by an indirect block */
-			int epb = db->db_parent->db.db_size >> SPA_BLKPTRSHIFT;
 			ASSERT3U(db->db_parent->db_level, ==, db->db_level+1);
 			ASSERT3U(db->db_parent->db.db_object, ==,
 			    db->db.db_object);
@@ -356,7 +355,9 @@ dbuf_verify(dmu_buf_impl_t *db)
 			if (RW_WRITE_HELD(&db->db_dnode->dn_struct_rwlock)) {
 				ASSERT3P(db->db_blkptr, ==,
 				    ((blkptr_t *)db->db_parent->db.db_data +
-				    db->db_blkid % epb));
+				    db->db_blkid %
+				    (db->db_parent->db.db_size >>
+				    SPA_BLKPTRSHIFT)));
 			}
 		}
 	}
@@ -369,11 +370,10 @@ dbuf_verify(dmu_buf_impl_t *db)
 		 * data when we evict this buffer.
 		 */
 		if (db->db_dirtycnt == 0) {
-			uint64_t *buf = db->db.db_data;
 			int i;
 
 			for (i = 0; i < db->db.db_size >> 3; i++) {
-				ASSERT(buf[i] == 0);
+				ASSERT(db->db.db_data[i] == 0);
 			}
 		}
 	}
diff --git a/module/zfs/dmu.c b/module/zfs/dmu.c
index ea2bcb9402..52373e8b63 100644
--- a/module/zfs/dmu.c
+++ b/module/zfs/dmu.c
@@ -823,10 +823,8 @@ dmu_sync_ready(zio_t *zio, arc_buf_t *buf, void *varg)
 	blkptr_t *bp = zio->io_bp;
 
 	if (!BP_IS_HOLE(bp)) {
-		dmu_sync_arg_t *in = varg;
-		dbuf_dirty_record_t *dr = in->dr;
-		dmu_buf_impl_t *db = dr->dr_dbuf;
-		ASSERT(BP_GET_TYPE(bp) == db->db_dnode->dn_type);
+		ASSERT(BP_GET_TYPE(bp) == ((dmu_sync_arg_t *)
+		       varg)->dr->dr_dbuf->db_dnode->dn_type);
 		ASSERT(BP_GET_LEVEL(bp) == 0);
 		bp->blk_fill = 1;
 	}
diff --git a/module/zfs/dmu_objset.c b/module/zfs/dmu_objset.c
index 5aa5be88b6..f2ff551860 100644
--- a/module/zfs/dmu_objset.c
+++ b/module/zfs/dmu_objset.c
@@ -862,7 +862,7 @@ ready(zio_t *zio, arc_buf_t *abuf, void *arg)
 		bp->blk_fill += dnp->dn_blkptr[i].blk_fill;
 
 	if (zio->io_flags & ZIO_FLAG_IO_REWRITE) {
-		ASSERT(DVA_EQUAL(BP_IDENTITY(bp), BP_IDENTITY(bp_orig)));
+		VERIFY(DVA_EQUAL(BP_IDENTITY(bp), BP_IDENTITY(bp_orig)));
 	} else {
 		if (zio->io_bp_orig.blk_birth == os->os_synctx->tx_txg)
 			(void) dsl_dataset_block_kill(os->os_dsl_dataset,
diff --git a/module/zfs/dsl_dataset.c b/module/zfs/dsl_dataset.c
index a7a7a7f226..e731aa3bfb 100644
--- a/module/zfs/dsl_dataset.c
+++ b/module/zfs/dsl_dataset.c
@@ -1702,7 +1702,7 @@ dsl_dataset_destroy_sync(void *arg1, void *tag, cred_t *cr, dmu_tx_t *tx)
 
 	if (ds->ds_phys->ds_next_clones_obj != 0) {
 		uint64_t count;
-		ASSERT(0 == zap_count(mos,
+		VERIFY(0 == zap_count(mos,
 		    ds->ds_phys->ds_next_clones_obj, &count) && count == 0);
 		VERIFY(0 == dmu_object_free(mos,
 		    ds->ds_phys->ds_next_clones_obj, tx));
diff --git a/module/zfs/spa.c b/module/zfs/spa.c
index 1ec801130d..5a34ed29fd 100644
--- a/module/zfs/spa.c
+++ b/module/zfs/spa.c
@@ -2897,7 +2897,6 @@ int
 spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot, int replacing)
 {
 	uint64_t txg, open_txg;
-	vdev_t *rvd = spa->spa_root_vdev;
 	vdev_t *oldvd, *newvd, *newrootvd, *pvd, *tvd;
 	vdev_ops_t *pvops;
 	dmu_tx_t *tx;
@@ -3015,7 +3014,7 @@ spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot, int replacing)
 	if (pvd->vdev_ops != pvops)
 		pvd = vdev_add_parent(oldvd, pvops);
 
-	ASSERT(pvd->vdev_top->vdev_parent == rvd);
+	ASSERT(pvd->vdev_top->vdev_parent == spa->spa_root_vdev);
 	ASSERT(pvd->vdev_ops == pvops);
 	ASSERT(oldvd->vdev_parent == pvd);
 
@@ -3034,7 +3033,7 @@ spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot, int replacing)
 
 	tvd = newvd->vdev_top;
 	ASSERT(pvd->vdev_top == tvd);
-	ASSERT(tvd->vdev_parent == rvd);
+	ASSERT(tvd->vdev_parent == spa->spa_root_vdev);
 
 	vdev_config_dirty(tvd);
 
@@ -3093,7 +3092,6 @@ spa_vdev_detach(spa_t *spa, uint64_t guid, uint64_t pguid, int replace_done)
 {
 	uint64_t txg;
 	int error;
-	vdev_t *rvd = spa->spa_root_vdev;
 	vdev_t *vd, *pvd, *cvd, *tvd;
 	boolean_t unspare = B_FALSE;
 	uint64_t unspare_guid = 0;
@@ -3238,7 +3236,7 @@ spa_vdev_detach(spa_t *spa, uint64_t guid, uint64_t pguid, int replace_done)
 	 * may have been the previous top-level vdev.
 	 */
 	tvd = cvd->vdev_top;
-	ASSERT(tvd->vdev_parent == rvd);
+	ASSERT(tvd->vdev_parent == spa->spa_root_vdev);
 
 	/*
 	 * Reevaluate the parent vdev state.
diff --git a/module/zfs/vdev.c b/module/zfs/vdev.c
index 0c3ca95115..e8dbd9f5a6 100644
--- a/module/zfs/vdev.c
+++ b/module/zfs/vdev.c
@@ -1221,9 +1221,8 @@ vdev_validate(vdev_t *vd)
 void
 vdev_close(vdev_t *vd)
 {
-	spa_t *spa = vd->vdev_spa;
-
-	ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL);
+	ASSERT(spa_config_held(vd->vdev_spa, SCL_STATE_ALL, RW_WRITER) ==
+	       SCL_STATE_ALL);
 
 	vd->vdev_ops->vdev_op_close(vd);
 
diff --git a/module/zfs/zap_micro.c b/module/zfs/zap_micro.c
index 070ac73921..d37c9f80a8 100644
--- a/module/zfs/zap_micro.c
+++ b/module/zfs/zap_micro.c
@@ -749,8 +749,8 @@ mzap_addent(zap_name_t *zn, uint64_t value)
 
 #ifdef ZFS_DEBUG
 	for (i = 0; i < zap->zap_m.zap_num_chunks; i++) {
-		mzap_ent_phys_t *mze = &zap->zap_m.zap_phys->mz_chunk[i];
-		ASSERT(strcmp(zn->zn_name_orij, mze->mze_name) != 0);
+		ASSERT(strcmp(zn->zn_name_orij,
+		       (&zap->zap_m.zap_phys->mz_chunk[i])->mze_name) != 0);
 	}
 #endif
 
diff --git a/module/zfs/zio.c b/module/zfs/zio.c
index 2f0fef10bc..2384e40cbf 100644
--- a/module/zfs/zio.c
+++ b/module/zfs/zio.c
@@ -1529,7 +1529,6 @@ static void
 zio_write_gang_member_ready(zio_t *zio)
 {
 	zio_t *pio = zio_unique_parent(zio);
-	zio_t *lio = zio->io_logical;
 	dva_t *cdva = zio->io_bp->blk_dva;
 	dva_t *pdva = pio->io_bp->blk_dva;
 	uint64_t asize;
@@ -1541,7 +1540,7 @@ zio_write_gang_member_ready(zio_t *zio)
 	ASSERT(BP_IS_HOLE(&zio->io_bp_orig));
 
 	ASSERT(zio->io_child_type == ZIO_CHILD_GANG);
-	ASSERT3U(zio->io_prop.zp_ndvas, ==, lio->io_prop.zp_ndvas);
+	ASSERT3U(zio->io_prop.zp_ndvas, ==, zio->io_logical->io_prop.zp_ndvas);
 	ASSERT3U(zio->io_prop.zp_ndvas, <=, BP_GET_NDVAS(zio->io_bp));
 	ASSERT3U(pio->io_prop.zp_ndvas, <=, BP_GET_NDVAS(pio->io_bp));
 	ASSERT3U(BP_GET_NDVAS(zio->io_bp), <=, BP_GET_NDVAS(pio->io_bp));