staging/lustre/obdclass: Adjust NULL comparison codestyle

All instances of "x == NULL" are changed to "!x" and
"x != NULL" to "x"

Also remove some redundant assertions.
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/obdclass/acl.c

@@ -104,7 +104,7 @@ static int lustre_posix_acl_xattr_reduce_space(posix_acl_xattr_header **header,
 		return old_size;
 
 	new = kmemdup(*header, new_size, GFP_NOFS);
-	if (unlikely(new == NULL))
+	if (unlikely(!new))
 		return -ENOMEM;
 
 	kfree(*header);
@@ -124,7 +124,7 @@ static int lustre_ext_acl_xattr_reduce_space(ext_acl_xattr_header **header,
 		return 0;
 
 	new = kmemdup(*header, ext_size, GFP_NOFS);
-	if (unlikely(new == NULL))
+	if (unlikely(!new))
 		return -ENOMEM;
 
 	kfree(*header);
@@ -149,7 +149,7 @@ lustre_posix_acl_xattr_2ext(posix_acl_xattr_header *header, int size)
 		count = CFS_ACL_XATTR_COUNT(size, posix_acl_xattr);
 	esize = CFS_ACL_XATTR_SIZE(count, ext_acl_xattr);
 	new = kzalloc(esize, GFP_NOFS);
-	if (unlikely(new == NULL))
+	if (unlikely(!new))
 		return ERR_PTR(-ENOMEM);
 
 	new->a_count = cpu_to_le32(count);
@@ -180,7 +180,7 @@ int lustre_posix_acl_xattr_filter(posix_acl_xattr_header *header, size_t size,
 		return -EINVAL;
 
 	new = kzalloc(size, GFP_NOFS);
-	if (unlikely(new == NULL))
+	if (unlikely(!new))
 		return -ENOMEM;
 
 	new->a_version = cpu_to_le32(CFS_ACL_XATTR_VERSION);
@@ -300,7 +300,7 @@ lustre_acl_xattr_merge2ext(posix_acl_xattr_header *posix_header, int size,
 	ext_size = CFS_ACL_XATTR_SIZE(ext_count, ext_acl_xattr);
 
 	new = kzalloc(ext_size, GFP_NOFS);
-	if (unlikely(new == NULL))
+	if (unlikely(!new))
 		return ERR_PTR(-ENOMEM);
 
 	for (i = 0, j = 0; i < posix_count; i++) {

drivers/staging/lustre/lustre/obdclass/cl_lock.c

@@ -96,7 +96,7 @@ static int cl_lock_invariant(const struct lu_env *env,
 
 	result = atomic_read(&lock->cll_ref) > 0 &&
 		cl_lock_invariant_trusted(env, lock);
-	if (!result && env != NULL)
+	if (!result && env)
 		CL_LOCK_DEBUG(D_ERROR, env, lock, "invariant broken");
 	return result;
 }
@@ -288,7 +288,7 @@ void cl_lock_put(const struct lu_env *env, struct cl_lock *lock)
 
 	LINVRNT(cl_lock_invariant(env, lock));
 	obj = lock->cll_descr.cld_obj;
-	LINVRNT(obj != NULL);
+	LINVRNT(obj);
 
 	CDEBUG(D_TRACE, "releasing reference: %d %p %lu\n",
 	       atomic_read(&lock->cll_ref), lock, RETIP);
@@ -362,7 +362,7 @@ static struct cl_lock *cl_lock_alloc(const struct lu_env *env,
 	struct lu_object_header *head;
 
 	lock = kmem_cache_alloc(cl_lock_kmem, GFP_NOFS | __GFP_ZERO);
-	if (lock != NULL) {
+	if (lock) {
 		atomic_set(&lock->cll_ref, 1);
 		lock->cll_descr = *descr;
 		lock->cll_state = CLS_NEW;
@@ -461,7 +461,7 @@ static int cl_lock_fits_into(const struct lu_env *env,
 
 	LINVRNT(cl_lock_invariant_trusted(env, lock));
 	list_for_each_entry(slice, &lock->cll_layers, cls_linkage) {
-		if (slice->cls_ops->clo_fits_into != NULL &&
+		if (slice->cls_ops->clo_fits_into &&
 		    !slice->cls_ops->clo_fits_into(env, slice, need, io))
 			return 0;
 	}
@@ -524,14 +524,14 @@ static struct cl_lock *cl_lock_find(const struct lu_env *env,
 	lock = cl_lock_lookup(env, obj, io, need);
 	spin_unlock(&head->coh_lock_guard);
 
-	if (lock == NULL) {
+	if (!lock) {
 		lock = cl_lock_alloc(env, obj, io, need);
 		if (!IS_ERR(lock)) {
 			struct cl_lock *ghost;
 
 			spin_lock(&head->coh_lock_guard);
 			ghost = cl_lock_lookup(env, obj, io, need);
-			if (ghost == NULL) {
+			if (!ghost) {
 				cl_lock_get_trust(lock);
 				list_add_tail(&lock->cll_linkage,
 						  &head->coh_locks);
@@ -572,7 +572,7 @@ struct cl_lock *cl_lock_peek(const struct lu_env *env, const struct cl_io *io,
 		spin_lock(&head->coh_lock_guard);
 		lock = cl_lock_lookup(env, obj, io, need);
 		spin_unlock(&head->coh_lock_guard);
-		if (lock == NULL)
+		if (!lock)
 			return NULL;
 
 		cl_lock_mutex_get(env, lock);
@@ -584,7 +584,7 @@ struct cl_lock *cl_lock_peek(const struct lu_env *env, const struct cl_io *io,
 			cl_lock_put(env, lock);
 			lock = NULL;
 		}
-	} while (lock == NULL);
+	} while (!lock);
 
 	cl_lock_hold_add(env, lock, scope, source);
 	cl_lock_user_add(env, lock);
@@ -775,7 +775,7 @@ static void cl_lock_cancel0(const struct lu_env *env, struct cl_lock *lock)
 		lock->cll_flags |= CLF_CANCELLED;
 		list_for_each_entry_reverse(slice, &lock->cll_layers,
 						cls_linkage) {
-			if (slice->cls_ops->clo_cancel != NULL)
+			if (slice->cls_ops->clo_cancel)
 				slice->cls_ops->clo_cancel(env, slice);
 		}
 	}
@@ -812,7 +812,7 @@ static void cl_lock_delete0(const struct lu_env *env, struct cl_lock *lock)
 		 */
 		list_for_each_entry_reverse(slice, &lock->cll_layers,
 						cls_linkage) {
-			if (slice->cls_ops->clo_delete != NULL)
+			if (slice->cls_ops->clo_delete)
 				slice->cls_ops->clo_delete(env, slice);
 		}
 		/*
@@ -974,7 +974,7 @@ static void cl_lock_state_signal(const struct lu_env *env, struct cl_lock *lock,
 	LINVRNT(cl_lock_invariant(env, lock));
 
 	list_for_each_entry(slice, &lock->cll_layers, cls_linkage)
-		if (slice->cls_ops->clo_state != NULL)
+		if (slice->cls_ops->clo_state)
 			slice->cls_ops->clo_state(env, slice, state);
 	wake_up_all(&lock->cll_wq);
 }
@@ -1039,7 +1039,7 @@ static int cl_unuse_try_internal(const struct lu_env *env, struct cl_lock *lock)
 		result = -ENOSYS;
 		list_for_each_entry_reverse(slice, &lock->cll_layers,
 						cls_linkage) {
-			if (slice->cls_ops->clo_unuse != NULL) {
+			if (slice->cls_ops->clo_unuse) {
 				result = slice->cls_ops->clo_unuse(env, slice);
 				if (result != 0)
 					break;
@@ -1072,7 +1072,7 @@ int cl_use_try(const struct lu_env *env, struct cl_lock *lock, int atomic)
 	result = -ENOSYS;
 	state = cl_lock_intransit(env, lock);
 	list_for_each_entry(slice, &lock->cll_layers, cls_linkage) {
-		if (slice->cls_ops->clo_use != NULL) {
+		if (slice->cls_ops->clo_use) {
 			result = slice->cls_ops->clo_use(env, slice);
 			if (result != 0)
 				break;
@@ -1125,7 +1125,7 @@ static int cl_enqueue_kick(const struct lu_env *env,
 
 	result = -ENOSYS;
 	list_for_each_entry(slice, &lock->cll_layers, cls_linkage) {
-		if (slice->cls_ops->clo_enqueue != NULL) {
+		if (slice->cls_ops->clo_enqueue) {
 			result = slice->cls_ops->clo_enqueue(env,
 							     slice, io, flags);
 			if (result != 0)
@@ -1215,7 +1215,7 @@ int cl_lock_enqueue_wait(const struct lu_env *env,
 
 	LASSERT(cl_lock_is_mutexed(lock));
 	LASSERT(lock->cll_state == CLS_QUEUING);
-	LASSERT(lock->cll_conflict != NULL);
+	LASSERT(lock->cll_conflict);
 
 	conflict = lock->cll_conflict;
 	lock->cll_conflict = NULL;
@@ -1258,7 +1258,7 @@ static int cl_enqueue_locked(const struct lu_env *env, struct cl_lock *lock,
 	do {
 		result = cl_enqueue_try(env, lock, io, enqflags);
 		if (result == CLO_WAIT) {
-			if (lock->cll_conflict != NULL)
+			if (lock->cll_conflict)
 				result = cl_lock_enqueue_wait(env, lock, 1);
 			else
 				result = cl_lock_state_wait(env, lock);
@@ -1416,7 +1416,7 @@ int cl_wait_try(const struct lu_env *env, struct cl_lock *lock)
 
 		result = -ENOSYS;
 		list_for_each_entry(slice, &lock->cll_layers, cls_linkage) {
-			if (slice->cls_ops->clo_wait != NULL) {
+			if (slice->cls_ops->clo_wait) {
 				result = slice->cls_ops->clo_wait(env, slice);
 				if (result != 0)
 					break;
@@ -1487,7 +1487,7 @@ unsigned long cl_lock_weigh(const struct lu_env *env, struct cl_lock *lock)
 
 	pound = 0;
 	list_for_each_entry_reverse(slice, &lock->cll_layers, cls_linkage) {
-		if (slice->cls_ops->clo_weigh != NULL) {
+		if (slice->cls_ops->clo_weigh) {
 			ounce = slice->cls_ops->clo_weigh(env, slice);
 			pound += ounce;
 			if (pound < ounce) /* over-weight^Wflow */
@@ -1523,7 +1523,7 @@ int cl_lock_modify(const struct lu_env *env, struct cl_lock *lock,
 	LINVRNT(cl_lock_invariant(env, lock));
 
 	list_for_each_entry_reverse(slice, &lock->cll_layers, cls_linkage) {
-		if (slice->cls_ops->clo_modify != NULL) {
+		if (slice->cls_ops->clo_modify) {
 			result = slice->cls_ops->clo_modify(env, slice, desc);
 			if (result != 0)
 				return result;
@@ -1584,7 +1584,7 @@ int cl_lock_closure_build(const struct lu_env *env, struct cl_lock *lock,
 	result = cl_lock_enclosure(env, lock, closure);
 	if (result == 0) {
 		list_for_each_entry(slice, &lock->cll_layers, cls_linkage) {
-			if (slice->cls_ops->clo_closure != NULL) {
+			if (slice->cls_ops->clo_closure) {
 				result = slice->cls_ops->clo_closure(env, slice,
 								     closure);
 				if (result != 0)
@@ -1820,7 +1820,6 @@ static pgoff_t pgoff_at_lock(struct cl_page *page, struct cl_lock *lock)
 
 	dtype = lock->cll_descr.cld_obj->co_lu.lo_dev->ld_type;
 	slice = cl_page_at(page, dtype);
-	LASSERT(slice != NULL);
 	return slice->cpl_page->cp_index;
 }
 
@@ -1840,7 +1839,7 @@ static int check_and_discard_cb(const struct lu_env *env, struct cl_io *io,
 		/* refresh non-overlapped index */
 		tmp = cl_lock_at_pgoff(env, lock->cll_descr.cld_obj, index,
 					lock, 1, 0);
-		if (tmp != NULL) {
+		if (tmp) {
 			/* Cache the first-non-overlapped index so as to skip
 			 * all pages within [index, clt_fn_index). This
 			 * is safe because if tmp lock is canceled, it will
@@ -1950,7 +1949,7 @@ void cl_locks_prune(const struct lu_env *env, struct cl_object *obj, int cancel)
 	 * already destroyed (as otherwise they will be left unprotected).
 	 */
 	LASSERT(ergo(!cancel,
-		     head->coh_tree.rnode == NULL && head->coh_pages == 0));
+		     !head->coh_tree.rnode && head->coh_pages == 0));
 
 	spin_lock(&head->coh_lock_guard);
 	while (!list_empty(&head->coh_locks)) {
@@ -2194,7 +2193,7 @@ void cl_lock_print(const struct lu_env *env, void *cookie,
 		(*printer)(env, cookie, "    %s@%p: ",
 			   slice->cls_obj->co_lu.lo_dev->ld_type->ldt_name,
 			   slice);
-		if (slice->cls_ops->clo_print != NULL)
+		if (slice->cls_ops->clo_print)
 			slice->cls_ops->clo_print(env, cookie, printer, slice);
 		(*printer)(env, cookie, "\n");
 	}

drivers/staging/lustre/lustre/obdclass/cl_object.c

@@ -152,7 +152,7 @@ struct cl_object *cl_object_top(struct cl_object *o)
 	struct cl_object_header *hdr = cl_object_header(o);
 	struct cl_object *top;
 
-	while (hdr->coh_parent != NULL)
+	while (hdr->coh_parent)
 		hdr = hdr->coh_parent;
 
 	top = lu2cl(lu_object_top(&hdr->coh_lu));
@@ -217,7 +217,7 @@ int cl_object_attr_get(const struct lu_env *env, struct cl_object *obj,
 	top = obj->co_lu.lo_header;
 	result = 0;
 	list_for_each_entry(obj, &top->loh_layers, co_lu.lo_linkage) {
-		if (obj->co_ops->coo_attr_get != NULL) {
+		if (obj->co_ops->coo_attr_get) {
 			result = obj->co_ops->coo_attr_get(env, obj, attr);
 			if (result != 0) {
 				if (result > 0)
@@ -249,7 +249,7 @@ int cl_object_attr_set(const struct lu_env *env, struct cl_object *obj,
 	result = 0;
 	list_for_each_entry_reverse(obj, &top->loh_layers,
 					co_lu.lo_linkage) {
-		if (obj->co_ops->coo_attr_set != NULL) {
+		if (obj->co_ops->coo_attr_set) {
 			result = obj->co_ops->coo_attr_set(env, obj, attr, v);
 			if (result != 0) {
 				if (result > 0)
@@ -280,7 +280,7 @@ int cl_object_glimpse(const struct lu_env *env, struct cl_object *obj,
 	result = 0;
 	list_for_each_entry_reverse(obj, &top->loh_layers,
 					co_lu.lo_linkage) {
-		if (obj->co_ops->coo_glimpse != NULL) {
+		if (obj->co_ops->coo_glimpse) {
 			result = obj->co_ops->coo_glimpse(env, obj, lvb);
 			if (result != 0)
 				break;
@@ -306,7 +306,7 @@ int cl_conf_set(const struct lu_env *env, struct cl_object *obj,
 	top = obj->co_lu.lo_header;
 	result = 0;
 	list_for_each_entry(obj, &top->loh_layers, co_lu.lo_linkage) {
-		if (obj->co_ops->coo_conf_set != NULL) {
+		if (obj->co_ops->coo_conf_set) {
 			result = obj->co_ops->coo_conf_set(env, obj, conf);
 			if (result != 0)
 				break;
@@ -328,7 +328,7 @@ void cl_object_kill(const struct lu_env *env, struct cl_object *obj)
 	struct cl_object_header *hdr;
 
 	hdr = cl_object_header(obj);
-	LASSERT(hdr->coh_tree.rnode == NULL);
+	LASSERT(!hdr->coh_tree.rnode);
 	LASSERT(hdr->coh_pages == 0);
 
 	set_bit(LU_OBJECT_HEARD_BANSHEE, &hdr->coh_lu.loh_flags);
@@ -541,7 +541,7 @@ static void cl_env_init0(struct cl_env *cle, void *debug)
 {
 	LASSERT(cle->ce_ref == 0);
 	LASSERT(cle->ce_magic == &cl_env_init0);
-	LASSERT(cle->ce_debug == NULL && cle->ce_owner == NULL);
+	LASSERT(!cle->ce_debug && !cle->ce_owner);
 
 	cle->ce_ref = 1;
 	cle->ce_debug = debug;
@@ -576,7 +576,7 @@ static int cl_env_hops_keycmp(const void *key, struct hlist_node *hn)
 {
 	struct cl_env *cle = cl_env_hops_obj(hn);
 
-	LASSERT(cle->ce_owner != NULL);
+	LASSERT(cle->ce_owner);
 	return (key == cle->ce_owner);
 }
 
@@ -610,7 +610,7 @@ static inline void cl_env_attach(struct cl_env *cle)
 	if (cle) {
 		int rc;
 
-		LASSERT(cle->ce_owner == NULL);
+		LASSERT(!cle->ce_owner);
 		cle->ce_owner = (void *) (long) current->pid;
 		rc = cfs_hash_add_unique(cl_env_hash, cle->ce_owner,
 					 &cle->ce_node);
@@ -638,7 +638,7 @@ static int cl_env_store_init(void)
 				      CFS_HASH_MAX_THETA,
 				      &cl_env_hops,
 				      CFS_HASH_RW_BKTLOCK);
-	return cl_env_hash != NULL ? 0 : -ENOMEM;
+	return cl_env_hash ? 0 : -ENOMEM;
 }
 
 static void cl_env_store_fini(void)
@@ -648,7 +648,7 @@ static void cl_env_store_fini(void)
 
 static inline struct cl_env *cl_env_detach(struct cl_env *cle)
 {
-	if (cle == NULL)
+	if (!cle)
 		cle = cl_env_fetch();
 
 	if (cle && cle->ce_owner)
@@ -663,7 +663,7 @@ static struct lu_env *cl_env_new(__u32 ctx_tags, __u32 ses_tags, void *debug)
 	struct cl_env *cle;
 
 	cle = kmem_cache_alloc(cl_env_kmem, GFP_NOFS | __GFP_ZERO);
-	if (cle != NULL) {
+	if (cle) {
 		int rc;
 
 		INIT_LIST_HEAD(&cle->ce_linkage);
@@ -717,7 +717,7 @@ static struct lu_env *cl_env_peek(int *refcheck)
 
 	env = NULL;
 	cle = cl_env_fetch();
-	if (cle != NULL) {
+	if (cle) {
 		CL_ENV_INC(hit);
 		env = &cle->ce_lu;
 		*refcheck = ++cle->ce_ref;
@@ -742,7 +742,7 @@ struct lu_env *cl_env_get(int *refcheck)
 	struct lu_env *env;
 
 	env = cl_env_peek(refcheck);
-	if (env == NULL) {
+	if (!env) {
 		env = cl_env_new(lu_context_tags_default,
 				 lu_session_tags_default,
 				 __builtin_return_address(0));
@@ -769,7 +769,7 @@ struct lu_env *cl_env_alloc(int *refcheck, __u32 tags)
 {
 	struct lu_env *env;
 
-	LASSERT(cl_env_peek(refcheck) == NULL);
+	LASSERT(!cl_env_peek(refcheck));
 	env = cl_env_new(tags, tags, __builtin_return_address(0));
 	if (!IS_ERR(env)) {
 		struct cl_env *cle;
@@ -784,7 +784,7 @@ EXPORT_SYMBOL(cl_env_alloc);
 
 static void cl_env_exit(struct cl_env *cle)
 {
-	LASSERT(cle->ce_owner == NULL);
+	LASSERT(!cle->ce_owner);
 	lu_context_exit(&cle->ce_lu.le_ctx);
 	lu_context_exit(&cle->ce_ses);
 }
@@ -803,7 +803,7 @@ void cl_env_put(struct lu_env *env, int *refcheck)
 	cle = cl_env_container(env);
 
 	LASSERT(cle->ce_ref > 0);
-	LASSERT(ergo(refcheck != NULL, cle->ce_ref == *refcheck));
+	LASSERT(ergo(refcheck, cle->ce_ref == *refcheck));
 
 	CDEBUG(D_OTHER, "%d@%p\n", cle->ce_ref, cle);
 	if (--cle->ce_ref == 0) {
@@ -878,7 +878,7 @@ struct lu_env *cl_env_nested_get(struct cl_env_nest *nest)
 
 	nest->cen_cookie = NULL;
 	env = cl_env_peek(&nest->cen_refcheck);
-	if (env != NULL) {
+	if (env) {
 		if (!cl_io_is_going(env))
 			return env;
 		cl_env_put(env, &nest->cen_refcheck);
@@ -930,14 +930,12 @@ struct cl_device *cl_type_setup(const struct lu_env *env, struct lu_site *site,
 	const char       *typename;
 	struct lu_device *d;
 
-	LASSERT(ldt != NULL);
-
 	typename = ldt->ldt_name;
 	d = ldt->ldt_ops->ldto_device_alloc(env, ldt, NULL);
 	if (!IS_ERR(d)) {
 		int rc;
 
-		if (site != NULL)
+		if (site)
 			d->ld_site = site;
 		rc = ldt->ldt_ops->ldto_device_init(env, d, typename, next);
 		if (rc == 0) {

drivers/staging/lustre/lustre/obdclass/class_obd.c

@@ -341,7 +341,7 @@ int class_handle_ioctl(unsigned int cmd, unsigned long arg)
 	}
 
 	if (data->ioc_dev == OBD_DEV_BY_DEVNAME) {
-		if (data->ioc_inllen4 <= 0 || data->ioc_inlbuf4 == NULL) {
+		if (data->ioc_inllen4 <= 0 || !data->ioc_inlbuf4) {
 			err = -EINVAL;
 			goto out;
 		}
@@ -358,7 +358,7 @@ int class_handle_ioctl(unsigned int cmd, unsigned long arg)
 		goto out;
 	}
 
-	if (obd == NULL) {
+	if (!obd) {
 		CERROR("OBD ioctl : No Device %d\n", data->ioc_dev);
 		err = -EINVAL;
 		goto out;

drivers/staging/lustre/lustre/obdclass/genops.c

@@ -70,17 +70,16 @@ static struct obd_device *obd_device_alloc(void)
 	struct obd_device *obd;
 
 	obd = kmem_cache_alloc(obd_device_cachep, GFP_NOFS | __GFP_ZERO);
-	if (obd != NULL)
+	if (obd)
 		obd->obd_magic = OBD_DEVICE_MAGIC;
 	return obd;
 }
 
 static void obd_device_free(struct obd_device *obd)
 {
-	LASSERT(obd != NULL);
 	LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "obd %p obd_magic %08x != %08x\n",
 		 obd, obd->obd_magic, OBD_DEVICE_MAGIC);
-	if (obd->obd_namespace != NULL) {
+	if (obd->obd_namespace) {
 		CERROR("obd %p: namespace %p was not properly cleaned up (obd_force=%d)!\n",
 		       obd, obd->obd_namespace, obd->obd_force);
 		LBUG();
@@ -194,7 +193,7 @@ int class_register_type(struct obd_ops *dt_ops, struct md_ops *md_ops,
 		goto failed;
 	}
 
-	if (ldt != NULL) {
+	if (ldt) {
 		type->typ_lu = ldt;
 		rc = lu_device_type_init(ldt);
 		if (rc != 0)
@@ -356,7 +355,7 @@ void class_release_dev(struct obd_device *obd)
 		 obd, obd->obd_magic, OBD_DEVICE_MAGIC);
 	LASSERTF(obd == obd_devs[obd->obd_minor], "obd %p != obd_devs[%d] %p\n",
 		 obd, obd->obd_minor, obd_devs[obd->obd_minor]);
-	LASSERT(obd_type != NULL);
+	LASSERT(obd_type);
 
 	CDEBUG(D_INFO, "Release obd device %s at %d obd_type name =%s\n",
 	       obd->obd_name, obd->obd_minor, obd->obd_type->typ_name);
@@ -650,7 +649,7 @@ static void class_export_destroy(struct obd_export *exp)
 	struct obd_device *obd = exp->exp_obd;
 
 	LASSERT_ATOMIC_ZERO(&exp->exp_refcount);
-	LASSERT(obd != NULL);
+	LASSERT(obd);
 
 	CDEBUG(D_IOCTL, "destroying export %p/%s for %s\n", exp,
 	       exp->exp_client_uuid.uuid, obd->obd_name);
@@ -690,7 +689,6 @@ EXPORT_SYMBOL(class_export_get);
 
 void class_export_put(struct obd_export *exp)
 {
-	LASSERT(exp != NULL);
 	LASSERT_ATOMIC_GT_LT(&exp->exp_refcount, 0, LI_POISON);
 	CDEBUG(D_INFO, "PUTting export %p : new refcount %d\n", exp,
 	       atomic_read(&exp->exp_refcount) - 1);
@@ -942,7 +940,7 @@ EXPORT_SYMBOL(class_new_import);
 
 void class_destroy_import(struct obd_import *import)
 {
-	LASSERT(import != NULL);
+	LASSERT(import);
 	LASSERT(import != LP_POISON);
 
 	class_handle_unhash(&import->imp_handle);
@@ -962,8 +960,7 @@ void __class_export_add_lock_ref(struct obd_export *exp, struct ldlm_lock *lock)
 
 	LASSERT(lock->l_exp_refs_nr >= 0);
 
-	if (lock->l_exp_refs_target != NULL &&
-	    lock->l_exp_refs_target != exp) {
+	if (lock->l_exp_refs_target && lock->l_exp_refs_target != exp) {
 		LCONSOLE_WARN("setting export %p for lock %p which already has export %p\n",
 			      exp, lock, lock->l_exp_refs_target);
 	}
@@ -1005,9 +1002,9 @@ int class_connect(struct lustre_handle *conn, struct obd_device *obd,
 {
 	struct obd_export *export;
 
-	LASSERT(conn != NULL);
-	LASSERT(obd != NULL);
-	LASSERT(cluuid != NULL);
+	LASSERT(conn);
+	LASSERT(obd);
+	LASSERT(cluuid);
 
 	export = class_new_export(obd, cluuid);
 	if (IS_ERR(export))
@@ -1133,14 +1130,14 @@ static void obd_zombie_impexp_cull(void)
 
 		spin_unlock(&obd_zombie_impexp_lock);
 
-		if (import != NULL) {
+		if (import) {
 			class_import_destroy(import);
 			spin_lock(&obd_zombie_impexp_lock);
 			zombies_count--;
 			spin_unlock(&obd_zombie_impexp_lock);
 		}
 
-		if (export != NULL) {
+		if (export) {
 			class_export_destroy(export);
 			spin_lock(&obd_zombie_impexp_lock);
 			zombies_count--;
@@ -1148,7 +1145,7 @@ static void obd_zombie_impexp_cull(void)
 		}
 
 		cond_resched();
-	} while (import != NULL || export != NULL);
+	} while (import || export);
 }
 
 static struct completion	obd_zombie_start;

drivers/staging/lustre/lustre/obdclass/linux/linux-module.c

@@ -106,7 +106,7 @@ int obd_ioctl_getdata(char **buf, int *len, void __user *arg)
 	 * obdfilter-survey is an example, which relies on ioctl. So we'd
 	 * better avoid vmalloc on ioctl path. LU-66 */
 	*buf = libcfs_kvzalloc(hdr.ioc_len, GFP_NOFS);
-	if (*buf == NULL) {
+	if (!*buf) {
 		CERROR("Cannot allocate control buffer of len %d\n",
 		       hdr.ioc_len);
 		return -EINVAL;
@@ -454,7 +454,6 @@ int class_procfs_init(void)
 
 int class_procfs_clean(void)
 {
-	if (debugfs_lustre_root != NULL)
 	debugfs_remove_recursive(debugfs_lustre_root);
 
 	debugfs_lustre_root = NULL;

drivers/staging/lustre/lustre/obdclass/llog.c

@@ -76,8 +76,6 @@ static struct llog_handle *llog_alloc_handle(void)
  */
 static void llog_free_handle(struct llog_handle *loghandle)
 {
-	LASSERT(loghandle != NULL);
-
 	/* failed llog_init_handle */
 	if (!loghandle->lgh_hdr)
 		goto out;
@@ -115,7 +113,7 @@ static int llog_read_header(const struct lu_env *env,
 	if (rc)
 		return rc;
 
-	if (lop->lop_read_header == NULL)
+	if (!lop->lop_read_header)
 		return -EOPNOTSUPP;
 
 	rc = lop->lop_read_header(env, handle);
@@ -144,7 +142,7 @@ int llog_init_handle(const struct lu_env *env, struct llog_handle *handle,
 	struct llog_log_hdr	*llh;
 	int			 rc;
 
-	LASSERT(handle->lgh_hdr == NULL);
+	LASSERT(!handle->lgh_hdr);
 
 	llh = kzalloc(sizeof(*llh), GFP_NOFS);
 	if (!llh)
@@ -228,11 +226,11 @@ static int llog_process_thread(void *arg)
 		return 0;
 	}
 
-	if (cd != NULL) {
+	if (cd) {
 		last_called_index = cd->lpcd_first_idx;
 		index = cd->lpcd_first_idx + 1;
 	}
-	if (cd != NULL && cd->lpcd_last_idx)
+	if (cd && cd->lpcd_last_idx)
 		last_index = cd->lpcd_last_idx;
 	else
 		last_index = LLOG_BITMAP_BYTES * 8 - 1;
@@ -328,7 +326,7 @@ static int llog_process_thread(void *arg)
 	}
 
 out:
-	if (cd != NULL)
+	if (cd)
 		cd->lpcd_last_idx = last_called_index;
 
 	kfree(buf);
@@ -419,13 +417,13 @@ int llog_open(const struct lu_env *env, struct llog_ctxt *ctxt,
 	LASSERT(ctxt);
 	LASSERT(ctxt->loc_logops);
 
-	if (ctxt->loc_logops->lop_open == NULL) {
+	if (!ctxt->loc_logops->lop_open) {
 		*lgh = NULL;
 		return -EOPNOTSUPP;
 	}
 
 	*lgh = llog_alloc_handle();
-	if (*lgh == NULL)
+	if (!*lgh)
 		return -ENOMEM;
 	(*lgh)->lgh_ctxt = ctxt;
 	(*lgh)->lgh_logops = ctxt->loc_logops;
@@ -452,7 +450,7 @@ int llog_close(const struct lu_env *env, struct llog_handle *loghandle)
 	rc = llog_handle2ops(loghandle, &lop);
 	if (rc)
 		goto out;
-	if (lop->lop_close == NULL) {
+	if (!lop->lop_close) {
 		rc = -EOPNOTSUPP;
 		goto out;
 	}

drivers/staging/lustre/lustre/obdclass/llog_cat.c

@@ -69,7 +69,7 @@ static int llog_cat_id2handle(const struct lu_env *env,
 	struct llog_handle	*loghandle;
 	int			 rc = 0;
 
-	if (cathandle == NULL)
+	if (!cathandle)
 		return -EBADF;
 
 	down_write(&cathandle->lgh_lock);

drivers/staging/lustre/lustre/obdclass/llog_obd.c

@@ -110,11 +110,8 @@ int llog_cleanup(const struct lu_env *env, struct llog_ctxt *ctxt)
 	struct obd_llog_group *olg;
 	int rc, idx;
 
-	LASSERT(ctxt != NULL);
-	LASSERT(ctxt != LP_POISON);
-
 	olg = ctxt->loc_olg;
-	LASSERT(olg != NULL);
+	LASSERT(olg);
 	LASSERT(olg != LP_POISON);
 
 	idx = ctxt->loc_idx;
@@ -151,7 +148,7 @@ int llog_setup(const struct lu_env *env, struct obd_device *obd,
 	if (index < 0 || index >= LLOG_MAX_CTXTS)
 		return -EINVAL;
 
-	LASSERT(olg != NULL);
+	LASSERT(olg);
 
 	ctxt = llog_new_ctxt(obd);
 	if (!ctxt)

drivers/staging/lustre/lustre/obdclass/lprocfs_counters.c

@@ -48,7 +48,7 @@ void lprocfs_counter_add(struct lprocfs_stats *stats, int idx, long amount)
 	int				smp_id;
 	unsigned long			flags = 0;
 
-	if (stats == NULL)
+	if (!stats)
 		return;
 
 	LASSERTF(0 <= idx && idx < stats->ls_num,
@@ -96,7 +96,7 @@ void lprocfs_counter_sub(struct lprocfs_stats *stats, int idx, long amount)
 	int				smp_id;
 	unsigned long			flags = 0;
 
-	if (stats == NULL)
+	if (!stats)
 		return;
 
 	LASSERTF(0 <= idx && idx < stats->ls_num,

drivers/staging/lustre/lustre/obdclass/lprocfs_status.c

@@ -109,7 +109,7 @@ int obd_connect_flags2str(char *page, int count, __u64 flags, char *sep)
 	__u64 mask = 1;
 	int i, ret = 0;
 
-	for (i = 0; obd_connect_names[i] != NULL; i++, mask <<= 1) {
+	for (i = 0; obd_connect_names[i]; i++, mask <<= 1) {
 		if (flags & mask)
 			ret += snprintf(page + ret, count - ret, "%s%s",
 					ret ? sep : "", obd_connect_names[i]);
@@ -199,7 +199,7 @@ int lprocfs_write_frac_helper(const char __user *buffer, unsigned long count,
 	if (pbuf == end)
 		return -EINVAL;
 
-	if (end != NULL && *end == '.') {
+	if (end && *end == '.') {
 		int temp_val, pow = 1;
 		int i;
 
@@ -247,7 +247,7 @@ struct dentry *ldebugfs_add_simple(struct dentry *root,
 	struct dentry *entry;
 	umode_t mode = 0;
 
-	if (root == NULL || name == NULL || fops == NULL)
+	if (!root || !name || !fops)
 		return ERR_PTR(-EINVAL);
 
 	if (fops->read)
@@ -272,7 +272,7 @@ int ldebugfs_add_vars(struct dentry *parent,
 	if (IS_ERR_OR_NULL(parent) || IS_ERR_OR_NULL(list))
 		return -EINVAL;
 
-	while (list->name != NULL) {
+	while (list->name) {
 		struct dentry *entry;
 		umode_t mode = 0;
 
@@ -491,7 +491,7 @@ int lprocfs_rd_server_uuid(struct seq_file *m, void *data)
 	char *imp_state_name = NULL;
 	int rc;
 
-	LASSERT(obd != NULL);
+	LASSERT(obd);
 	rc = lprocfs_climp_check(obd);
 	if (rc)
 		return rc;
@@ -514,7 +514,7 @@ int lprocfs_rd_conn_uuid(struct seq_file *m, void *data)
 	struct ptlrpc_connection *conn;
 	int rc;
 
-	LASSERT(obd != NULL);
+	LASSERT(obd);
 
 	rc = lprocfs_climp_check(obd);
 	if (rc)
@@ -543,7 +543,7 @@ void lprocfs_stats_collect(struct lprocfs_stats *stats, int idx,
 
 	memset(cnt, 0, sizeof(*cnt));
 
-	if (stats == NULL) {
+	if (!stats) {
 		/* set count to 1 to avoid divide-by-zero errs in callers */
 		cnt->lc_count = 1;
 		return;
@@ -554,7 +554,7 @@ void lprocfs_stats_collect(struct lprocfs_stats *stats, int idx,
 	num_entry = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);
 
 	for (i = 0; i < num_entry; i++) {
-		if (stats->ls_percpu[i] == NULL)
+		if (!stats->ls_percpu[i])
 			continue;
 		percpu_cntr = lprocfs_stats_counter_get(stats, i, idx);
 
@@ -604,7 +604,7 @@ static void obd_connect_seq_flags2str(struct seq_file *m, __u64 flags, char *sep
 	int i;
 	bool first = true;
 
-	for (i = 0; obd_connect_names[i] != NULL; i++, mask <<= 1) {
+	for (i = 0; obd_connect_names[i]; i++, mask <<= 1) {
 		if (flags & mask) {
 			seq_printf(m, "%s%s",
 					first ? sep : "", obd_connect_names[i]);
@@ -629,7 +629,7 @@ int lprocfs_rd_import(struct seq_file *m, void *data)
 	int				rw	= 0;
 	int				rc;
 
-	LASSERT(obd != NULL);
+	LASSERT(obd);
 	rc = lprocfs_climp_check(obd);
 	if (rc)
 		return rc;
@@ -665,7 +665,7 @@ int lprocfs_rd_import(struct seq_file *m, void *data)
 		seq_printf(m, "%s%s", j ? ", " : "", nidstr);
 		j++;
 	}
-	if (imp->imp_connection != NULL)
+	if (imp->imp_connection)
 		libcfs_nid2str_r(imp->imp_connection->c_peer.nid,
 				 nidstr, sizeof(nidstr));
 	else
@@ -682,7 +682,7 @@ int lprocfs_rd_import(struct seq_file *m, void *data)
 		      atomic_read(&imp->imp_inval_count));
 	spin_unlock(&imp->imp_lock);
 
-	if (obd->obd_svc_stats == NULL)
+	if (!obd->obd_svc_stats)
 		goto out_climp;
 
 	header = &obd->obd_svc_stats->ls_cnt_header[PTLRPC_REQWAIT_CNTR];
@@ -779,7 +779,7 @@ int lprocfs_rd_state(struct seq_file *m, void *data)
 	struct obd_import *imp;
 	int j, k, rc;
 
-	LASSERT(obd != NULL);
+	LASSERT(obd);
 	rc = lprocfs_climp_check(obd);
 	if (rc)
 		return rc;
@@ -825,7 +825,7 @@ int lprocfs_rd_timeouts(struct seq_file *m, void *data)
 	struct dhms ts;
 	int i, rc;
 
-	LASSERT(obd != NULL);
+	LASSERT(obd);
 	rc = lprocfs_climp_check(obd);
 	if (rc)
 		return rc;
@@ -967,12 +967,12 @@ int lprocfs_stats_alloc_one(struct lprocfs_stats *stats, unsigned int cpuid)
 	unsigned long           flags = 0;
 	int                     i;
 
-	LASSERT(stats->ls_percpu[cpuid] == NULL);
+	LASSERT(!stats->ls_percpu[cpuid]);
 	LASSERT((stats->ls_flags & LPROCFS_STATS_FLAG_NOPERCPU) == 0);
 
 	percpusize = lprocfs_stats_counter_size(stats);
 	LIBCFS_ALLOC_ATOMIC(stats->ls_percpu[cpuid], percpusize);
-	if (stats->ls_percpu[cpuid] != NULL) {
+	if (stats->ls_percpu[cpuid]) {
 		rc = 0;
 		if (unlikely(stats->ls_biggest_alloc_num <= cpuid)) {
 			if (stats->ls_flags & LPROCFS_STATS_FLAG_IRQ_SAFE)
@@ -1017,7 +1017,7 @@ struct lprocfs_stats *lprocfs_alloc_stats(unsigned int num,
 
 	/* alloc percpu pointers for all possible cpu slots */
 	LIBCFS_ALLOC(stats, offsetof(typeof(*stats), ls_percpu[num_entry]));
-	if (stats == NULL)
+	if (!stats)
 		return NULL;
 
 	stats->ls_num = num;
@@ -1027,14 +1027,14 @@ struct lprocfs_stats *lprocfs_alloc_stats(unsigned int num,
 	/* alloc num of counter headers */
 	LIBCFS_ALLOC(stats->ls_cnt_header,
 		     stats->ls_num * sizeof(struct lprocfs_counter_header));
-	if (stats->ls_cnt_header == NULL)
+	if (!stats->ls_cnt_header)
 		goto fail;
 
 	if ((flags & LPROCFS_STATS_FLAG_NOPERCPU) != 0) {
 		/* contains only one set counters */
 		percpusize = lprocfs_stats_counter_size(stats);
 		LIBCFS_ALLOC_ATOMIC(stats->ls_percpu[0], percpusize);
-		if (stats->ls_percpu[0] == NULL)
+		if (!stats->ls_percpu[0])
 			goto fail;
 		stats->ls_biggest_alloc_num = 1;
 	} else if ((flags & LPROCFS_STATS_FLAG_IRQ_SAFE) != 0) {
@@ -1059,7 +1059,7 @@ void lprocfs_free_stats(struct lprocfs_stats **statsh)
 	unsigned int percpusize;
 	unsigned int i;
 
-	if (stats == NULL || stats->ls_num == 0)
+	if (!stats || stats->ls_num == 0)
 		return;
 	*statsh = NULL;
 
@@ -1070,9 +1070,9 @@ void lprocfs_free_stats(struct lprocfs_stats **statsh)
 
 	percpusize = lprocfs_stats_counter_size(stats);
 	for (i = 0; i < num_entry; i++)
-		if (stats->ls_percpu[i] != NULL)
+		if (stats->ls_percpu[i])
 			LIBCFS_FREE(stats->ls_percpu[i], percpusize);
-	if (stats->ls_cnt_header != NULL)
+	if (stats->ls_cnt_header)
 		LIBCFS_FREE(stats->ls_cnt_header, stats->ls_num *
 					sizeof(struct lprocfs_counter_header));
 	LIBCFS_FREE(stats, offsetof(typeof(*stats), ls_percpu[num_entry]));
@@ -1090,7 +1090,7 @@ void lprocfs_clear_stats(struct lprocfs_stats *stats)
 	num_entry = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);
 
 	for (i = 0; i < num_entry; i++) {
-		if (stats->ls_percpu[i] == NULL)
+		if (!stats->ls_percpu[i])
 			continue;
 		for (j = 0; j < stats->ls_num; j++) {
 			percpu_cntr = lprocfs_stats_counter_get(stats, i, j);
@@ -1230,10 +1230,8 @@ void lprocfs_counter_init(struct lprocfs_stats *stats, int index,
 	unsigned int			i;
 	unsigned int			num_cpu;
 
-	LASSERT(stats != NULL);
-
 	header = &stats->ls_cnt_header[index];
-	LASSERTF(header != NULL, "Failed to allocate stats header:[%d]%s/%s\n",
+	LASSERTF(header, "Failed to allocate stats header:[%d]%s/%s\n",
 		 index, name, units);
 
 	header->lc_config = conf;
@@ -1242,7 +1240,7 @@ void lprocfs_counter_init(struct lprocfs_stats *stats, int index,
 
 	num_cpu = lprocfs_stats_lock(stats, LPROCFS_GET_NUM_CPU, &flags);
 	for (i = 0; i < num_cpu; ++i) {
-		if (stats->ls_percpu[i] == NULL)
+		if (!stats->ls_percpu[i])
 			continue;
 		percpu_cntr = lprocfs_stats_counter_get(stats, i, index);
 		percpu_cntr->lc_count		= 0;
@@ -1270,7 +1268,7 @@ __s64 lprocfs_read_helper(struct lprocfs_counter *lc,
 {
 	__s64 ret = 0;
 
-	if (lc == NULL || header == NULL)
+	if (!lc || !header)
 		return 0;
 
 	switch (field) {
@@ -1412,7 +1410,7 @@ char *lprocfs_find_named_value(const char *buffer, const char *name,
 
 	/* there is no strnstr() in rhel5 and ubuntu kernels */
 	val = lprocfs_strnstr(buffer, name, buflen);
-	if (val == NULL)
+	if (!val)
 		return (char *)buffer;
 
 	val += strlen(name);			     /* skip prefix */

drivers/staging/lustre/lustre/obdclass/lustre_handles.c

@@ -65,7 +65,7 @@ void class_handle_hash(struct portals_handle *h,
 {
 	struct handle_bucket *bucket;
 
-	LASSERT(h != NULL);
+	LASSERT(h);
 	LASSERT(list_empty(&h->h_link));
 
 	/*
@@ -140,7 +140,7 @@ void *class_handle2object(__u64 cookie)
 	struct portals_handle *h;
 	void *retval = NULL;
 
-	LASSERT(handle_hash != NULL);
+	LASSERT(handle_hash);
 
 	/* Be careful when you want to change this code. See the
 	 * rcu_read_lock() definition on top this file. - jxiong */
@@ -170,7 +170,7 @@ void class_handle_free_cb(struct rcu_head *rcu)
 	struct portals_handle *h = RCU2HANDLE(rcu);
 	void *ptr = (void *)(unsigned long)h->h_cookie;
 
-	if (h->h_ops->hop_free != NULL)
+	if (h->h_ops->hop_free)
 		h->h_ops->hop_free(ptr, h->h_size);
 	else
 		kfree(ptr);
@@ -183,11 +183,11 @@ int class_handle_init(void)
 	struct timespec64 ts;
 	int seed[2];
 
-	LASSERT(handle_hash == NULL);
+	LASSERT(!handle_hash);
 
 	handle_hash = libcfs_kvzalloc(sizeof(*bucket) * HANDLE_HASH_SIZE,
 				      GFP_NOFS);
-	if (handle_hash == NULL)
+	if (!handle_hash)
 		return -ENOMEM;
 
 	spin_lock_init(&handle_base_lock);
@@ -234,7 +234,7 @@ void class_handle_cleanup(void)
 {
 	int count;
 
-	LASSERT(handle_hash != NULL);
+	LASSERT(handle_hash);
 
 	count = cleanup_all_handles();
 

drivers/staging/lustre/lustre/obdclass/lustre_peer.c

@@ -151,7 +151,7 @@ int class_del_uuid(const char *uuid)
 	struct uuid_nid_data *data;
 
 	spin_lock(&g_uuid_lock);
-	if (uuid != NULL) {
+	if (uuid) {
 		struct obd_uuid tmp;
 
 		obd_str2uuid(&tmp, uuid);
@@ -165,7 +165,7 @@ int class_del_uuid(const char *uuid)
 		list_splice_init(&g_uuid_list, &deathrow);
 	spin_unlock(&g_uuid_lock);
 
-	if (uuid != NULL && list_empty(&deathrow)) {
+	if (uuid && list_empty(&deathrow)) {
 		CDEBUG(D_INFO, "Try to delete a non-existent uuid %s\n", uuid);
 		return -EINVAL;
 	}

drivers/staging/lustre/lustre/obdclass/obd_config.c

@@ -210,7 +210,7 @@ static int class_attach(struct lustre_cfg *lcfg)
 		       name, typename, rc);
 		goto out;
 	}
-	LASSERTF(obd != NULL, "Cannot get obd device %s of type %s\n",
+	LASSERTF(obd, "Cannot get obd device %s of type %s\n",
 		 name, typename);
 	LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
 		 "obd %p obd_magic %08X != %08X\n",
@@ -272,9 +272,9 @@ static int class_attach(struct lustre_cfg *lcfg)
 	       obd->obd_minor, typename, atomic_read(&obd->obd_refcount));
 	return 0;
  out:
-	if (obd != NULL) {
+	if (obd)
 		class_release_dev(obd);
-	}
+
 	return rc;
 }
 
@@ -286,7 +286,7 @@ static int class_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 	int err = 0;
 	struct obd_export *exp;
 
-	LASSERT(obd != NULL);
+	LASSERT(obd);
 	LASSERTF(obd == class_num2obd(obd->obd_minor),
 		 "obd %p != obd_devs[%d] %p\n",
 		 obd, obd->obd_minor, class_num2obd(obd->obd_minor));
@@ -1183,7 +1183,7 @@ int class_config_llog_handler(const struct lu_env *env,
 
 		/* we override the llog's uuid for clients, to insure they
 		are unique */
-		if (clli && clli->cfg_instance != NULL &&
+		if (clli && clli->cfg_instance &&
 		    lcfg->lcfg_command == LCFG_ATTACH) {
 			lustre_cfg_bufs_set_string(&bufs, 2,
 						   clli->cfg_uuid.uuid);
@@ -1270,7 +1270,7 @@ int class_config_parse_llog(const struct lu_env *env, struct llog_ctxt *ctxt,
 	if (cfg) {
 		cd.lpcd_first_idx = cfg->cfg_last_idx;
 		callback = cfg->cfg_callback;
-		LASSERT(callback != NULL);
+		LASSERT(callback);
 	} else {
 		callback = class_config_llog_handler;
 	}

drivers/staging/lustre/lustre/obdclass/obd_mount.c

@@ -518,13 +518,12 @@ static int lustre_free_lsi(struct super_block *sb)
 {
 	struct lustre_sb_info *lsi = s2lsi(sb);
 
-	LASSERT(lsi != NULL);
 	CDEBUG(D_MOUNT, "Freeing lsi %p\n", lsi);
 
 	/* someone didn't call server_put_mount. */
 	LASSERT(atomic_read(&lsi->lsi_mounts) == 0);
 
-	if (lsi->lsi_lmd != NULL) {
+	if (lsi->lsi_lmd) {
 		kfree(lsi->lsi_lmd->lmd_dev);
 		kfree(lsi->lsi_lmd->lmd_profile);
 		kfree(lsi->lsi_lmd->lmd_mgssec);
@@ -538,7 +537,7 @@ static int lustre_free_lsi(struct super_block *sb)
 		kfree(lsi->lsi_lmd);
 	}
 
-	LASSERT(lsi->lsi_llsbi == NULL);
+	LASSERT(!lsi->lsi_llsbi);
 	kfree(lsi);
 	s2lsi_nocast(sb) = NULL;
 
@@ -551,8 +550,6 @@ static int lustre_put_lsi(struct super_block *sb)
 {
 	struct lustre_sb_info *lsi = s2lsi(sb);
 
-	LASSERT(lsi != NULL);
-
 	CDEBUG(D_MOUNT, "put %p %d\n", sb, atomic_read(&lsi->lsi_mounts));
 	if (atomic_dec_and_test(&lsi->lsi_mounts)) {
 		lustre_free_lsi(sb);
@@ -588,12 +585,12 @@ static int server_name2fsname(const char *svname, char *fsname,
 	if (dash == svname)
 		return -EINVAL;
 
-	if (fsname != NULL) {
+	if (fsname) {
 		strncpy(fsname, svname, dash - svname);
 		fsname[dash - svname] = '\0';
 	}
 
-	if (endptr != NULL)
+	if (endptr)
 		*endptr = dash;
 
 	return 0;
@@ -627,18 +624,18 @@ static int server_name2index(const char *svname, __u32 *idx,
 	dash += 3;
 
 	if (strncmp(dash, "all", 3) == 0) {
-		if (endptr != NULL)
+		if (endptr)
 			*endptr = dash + 3;
 		return rc | LDD_F_SV_ALL;
 	}
 
 	index = simple_strtoul(dash, (char **)endptr, 16);
-	if (idx != NULL)
+	if (idx)
 		*idx = index;
 
 	/* Account for -mdc after index that is possible when specifying mdt */
-	if (endptr != NULL && strncmp(LUSTRE_MDC_NAME, *endptr + 1,
-				      sizeof(LUSTRE_MDC_NAME)-1) == 0)
+	if (endptr && strncmp(LUSTRE_MDC_NAME, *endptr + 1,
+			      sizeof(LUSTRE_MDC_NAME) - 1) == 0)
 		*endptr += sizeof(LUSTRE_MDC_NAME);
 
 	return rc;
@@ -788,7 +785,7 @@ static int lmd_parse_mgssec(struct lustre_mount_data *lmd, char *ptr)
 	lmd->lmd_mgssec = NULL;
 
 	tail = strchr(ptr, ',');
-	if (tail == NULL)
+	if (!tail)
 		length = strlen(ptr);
 	else
 		length = tail - ptr;
@@ -807,14 +804,14 @@ static int lmd_parse_string(char **handle, char *ptr)
 	char   *tail;
 	int     length;
 
-	if ((handle == NULL) || (ptr == NULL))
+	if (!handle || !ptr)
 		return -EINVAL;
 
 	kfree(*handle);
 	*handle = NULL;
 
 	tail = strchr(ptr, ',');
-	if (tail == NULL)
+	if (!tail)
 		length = strlen(ptr);
 	else
 		length = tail - ptr;
@@ -847,14 +844,14 @@ static int lmd_parse_mgs(struct lustre_mount_data *lmd, char **ptr)
 		return -EINVAL;
 	}
 
-	if (lmd->lmd_mgs != NULL)
+	if (lmd->lmd_mgs)
 		oldlen = strlen(lmd->lmd_mgs) + 1;
 
 	mgsnid = kzalloc(oldlen + length + 1, GFP_NOFS);
 	if (!mgsnid)
 		return -ENOMEM;
 
-	if (lmd->lmd_mgs != NULL) {
+	if (lmd->lmd_mgs) {
 		/* Multiple mgsnid= are taken to mean failover locations */
 		memcpy(mgsnid, lmd->lmd_mgs, oldlen);
 		mgsnid[oldlen - 1] = ':';
@@ -981,7 +978,7 @@ static int lmd_parse(char *options, struct lustre_mount_data *lmd)
 			size_t length, params_length;
 			char *tail = strchr(s1 + 6, ',');
 
-			if (tail == NULL)
+			if (!tail)
 				length = strlen(s1);
 			else
 				length = tail - s1;
@@ -1011,7 +1008,7 @@ static int lmd_parse(char *options, struct lustre_mount_data *lmd)
 
 		/* Find next opt */
 		s2 = strchr(s1, ',');
-		if (s2 == NULL) {
+		if (!s2) {
 			if (clear)
 				*s1 = '\0';
 			break;
@@ -1113,9 +1110,9 @@ static int lustre_fill_super(struct super_block *sb, void *data, int silent)
 
 	if (lmd_is_client(lmd)) {
 		CDEBUG(D_MOUNT, "Mounting client %s\n", lmd->lmd_profile);
-		if (client_fill_super == NULL)
+		if (!client_fill_super)
 			request_module("lustre");
-		if (client_fill_super == NULL) {
+		if (!client_fill_super) {
 			LCONSOLE_ERROR_MSG(0x165, "Nothing registered for client mount! Is the 'lustre' module loaded?\n");
 			lustre_put_lsi(sb);
 			rc = -ENODEV;