[PATCH 5/6] treewide: use kv[mz]alloc* rather than opencoded variants

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From: Michal Hocko <mhocko@xxxxxxxx>

There are many code paths opencoding kvmalloc. Let's use the helper
instead. The main difference to kvmalloc is that those users are usually
not considering all the aspects of the memory allocator. E.g. allocation
requests < 64kB are basically never failing and invoke OOM killer to
satisfy the allocation. This sounds too disruptive for something that
has a reasonable fallback - the vmalloc. On the other hand those
requests might fallback to vmalloc even when the memory allocator would
succeed after several more reclaim/compaction attempts previously. There
is no guarantee something like that happens though.

This patch converts many of those places to kv[mz]alloc* helpers because
they are more conservative.

Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Cc: Anton Vorontsov <anton@xxxxxxxxxx>
Cc: Colin Cross <ccross@xxxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>
Cc: Ben Skeggs <bskeggs@xxxxxxxxxx>
Cc: Kent Overstreet <kent.overstreet@xxxxxxxxx>
Cc: Santosh Raspatur <santosh@xxxxxxxxxxx>
Cc: Hariprasad S <hariprasad@xxxxxxxxxxx>
Cc: Tariq Toukan <tariqt@xxxxxxxxxxxx>
Cc: Yishai Hadas <yishaih@xxxxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Oleg Drokin <oleg.drokin@xxxxxxxxx>
Cc: Andreas Dilger <andreas.dilger@xxxxxxxxx>
Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Cc: David Sterba <dsterba@xxxxxxxx>
Cc: "Yan, Zheng" <zyan@xxxxxxxxxx>
Cc: Ilya Dryomov <idryomov@xxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Alexei Starovoitov <ast@xxxxxxxxxx>
Cc: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Cc: netdev@xxxxxxxxxxxxxxx
Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
---
 arch/s390/kvm/kvm-s390.c                           | 10 ++-----
 crypto/lzo.c                                       |  4 +--
 drivers/acpi/apei/erst.c                           |  8 ++---
 drivers/char/agp/generic.c                         |  8 +----
 drivers/gpu/drm/nouveau/nouveau_gem.c              |  4 +--
 drivers/md/bcache/util.h                           | 12 ++------
 drivers/net/ethernet/chelsio/cxgb3/cxgb3_defs.h    |  3 --
 drivers/net/ethernet/chelsio/cxgb3/cxgb3_offload.c | 25 ++--------------
 drivers/net/ethernet/chelsio/cxgb3/l2t.c           |  2 +-
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c    | 31 ++++----------------
 drivers/net/ethernet/mellanox/mlx4/en_tx.c         |  9 ++----
 drivers/net/ethernet/mellanox/mlx4/mr.c            |  9 ++----
 drivers/nvdimm/dimm_devs.c                         |  5 +---
 .../staging/lustre/lnet/libcfs/linux/linux-mem.c   | 11 +------
 drivers/xen/evtchn.c                               | 14 +--------
 fs/btrfs/ctree.c                                   |  9 ++----
 fs/btrfs/ioctl.c                                   |  9 ++----
 fs/btrfs/send.c                                    | 27 ++++++-----------
 fs/ceph/file.c                                     |  9 ++----
 fs/select.c                                        |  5 +---
 fs/xattr.c                                         | 27 ++++++-----------
 kernel/bpf/hashtab.c                               | 11 ++-----
 lib/iov_iter.c                                     |  5 +---
 mm/frame_vector.c                                  |  5 +---
 net/ipv4/inet_hashtables.c                         |  6 +---
 net/ipv4/tcp_metrics.c                             |  5 +---
 net/mpls/af_mpls.c                                 |  5 +---
 net/netfilter/x_tables.c                           | 34 ++++++----------------
 net/netfilter/xt_recent.c                          |  5 +---
 net/sched/sch_choke.c                              |  5 +---
 net/sched/sch_fq_codel.c                           | 26 ++++-------------
 net/sched/sch_hhf.c                                | 33 ++++++---------------
 net/sched/sch_netem.c                              |  6 +---
 net/sched/sch_sfq.c                                |  6 +---
 security/keys/keyctl.c                             | 22 ++++----------
 35 files changed, 96 insertions(+), 319 deletions(-)

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 4f74511015b8..e6bbb33d2956 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -1126,10 +1126,7 @@ static long kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
 	if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
 		return -EINVAL;
 
-	keys = kmalloc_array(args->count, sizeof(uint8_t),
-			     GFP_KERNEL | __GFP_NOWARN);
-	if (!keys)
-		keys = vmalloc(sizeof(uint8_t) * args->count);
+	keys = kvmalloc(args->count * sizeof(uint8_t), GFP_KERNEL);
 	if (!keys)
 		return -ENOMEM;
 
@@ -1171,10 +1168,7 @@ static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
 	if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
 		return -EINVAL;
 
-	keys = kmalloc_array(args->count, sizeof(uint8_t),
-			     GFP_KERNEL | __GFP_NOWARN);
-	if (!keys)
-		keys = vmalloc(sizeof(uint8_t) * args->count);
+	keys = kvmalloc(sizeof(uint8_t) * args->count, GFP_KERNEL);
 	if (!keys)
 		return -ENOMEM;
 
diff --git a/crypto/lzo.c b/crypto/lzo.c
index 168df784da84..218567d717d6 100644
--- a/crypto/lzo.c
+++ b/crypto/lzo.c
@@ -32,9 +32,7 @@ static void *lzo_alloc_ctx(struct crypto_scomp *tfm)
 {
 	void *ctx;
 
-	ctx = kmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL | __GFP_NOWARN);
-	if (!ctx)
-		ctx = vmalloc(LZO1X_MEM_COMPRESS);
+	ctx = kvmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
 	if (!ctx)
 		return ERR_PTR(-ENOMEM);
 
diff --git a/drivers/acpi/apei/erst.c b/drivers/acpi/apei/erst.c
index ec4f507b524f..a2898df61744 100644
--- a/drivers/acpi/apei/erst.c
+++ b/drivers/acpi/apei/erst.c
@@ -513,7 +513,7 @@ static int __erst_record_id_cache_add_one(void)
 	if (i < erst_record_id_cache.len)
 		goto retry;
 	if (erst_record_id_cache.len >= erst_record_id_cache.size) {
-		int new_size, alloc_size;
+		int new_size;
 		u64 *new_entries;
 
 		new_size = erst_record_id_cache.size * 2;
@@ -524,11 +524,7 @@ static int __erst_record_id_cache_add_one(void)
 				pr_warn(FW_WARN "too many record IDs!\n");
 			return 0;
 		}
-		alloc_size = new_size * sizeof(entries[0]);
-		if (alloc_size < PAGE_SIZE)
-			new_entries = kmalloc(alloc_size, GFP_KERNEL);
-		else
-			new_entries = vmalloc(alloc_size);
+		new_entries = kvmalloc(new_size * sizeof(entries[0]), GFP_KERNEL);
 		if (!new_entries)
 			return -ENOMEM;
 		memcpy(new_entries, entries,
diff --git a/drivers/char/agp/generic.c b/drivers/char/agp/generic.c
index f002fa5d1887..bdf418cac8ef 100644
--- a/drivers/char/agp/generic.c
+++ b/drivers/char/agp/generic.c
@@ -88,13 +88,7 @@ static int agp_get_key(void)
 
 void agp_alloc_page_array(size_t size, struct agp_memory *mem)
 {
-	mem->pages = NULL;
-
-	if (size <= 2*PAGE_SIZE)
-		mem->pages = kmalloc(size, GFP_KERNEL | __GFP_NOWARN);
-	if (mem->pages == NULL) {
-		mem->pages = vmalloc(size);
-	}
+	mem->pages = kvmalloc(size, GFP_KERNEL);
 }
 EXPORT_SYMBOL(agp_alloc_page_array);
 
diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.c b/drivers/gpu/drm/nouveau/nouveau_gem.c
index 201b52b750dd..77dd73ff126f 100644
--- a/drivers/gpu/drm/nouveau/nouveau_gem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_gem.c
@@ -568,9 +568,7 @@ u_memcpya(uint64_t user, unsigned nmemb, unsigned size)
 
 	size *= nmemb;
 
-	mem = kmalloc(size, GFP_KERNEL | __GFP_NOWARN);
-	if (!mem)
-		mem = vmalloc(size);
+	mem = kvmalloc(size, GFP_KERNEL);
 	if (!mem)
 		return ERR_PTR(-ENOMEM);
 
diff --git a/drivers/md/bcache/util.h b/drivers/md/bcache/util.h
index cf2cbc211d83..d00bcb64d3a8 100644
--- a/drivers/md/bcache/util.h
+++ b/drivers/md/bcache/util.h
@@ -43,11 +43,7 @@ struct closure;
 	(heap)->used = 0;						\
 	(heap)->size = (_size);						\
 	_bytes = (heap)->size * sizeof(*(heap)->data);			\
-	(heap)->data = NULL;						\
-	if (_bytes < KMALLOC_MAX_SIZE)					\
-		(heap)->data = kmalloc(_bytes, (gfp));			\
-	if ((!(heap)->data) && ((gfp) & GFP_KERNEL))			\
-		(heap)->data = vmalloc(_bytes);				\
+	(heap)->data = kvmalloc(_bytes, (gfp) & GFP_KERNEL);		\
 	(heap)->data;							\
 })
 
@@ -136,12 +132,8 @@ do {									\
 									\
 	(fifo)->mask = _allocated_size - 1;				\
 	(fifo)->front = (fifo)->back = 0;				\
-	(fifo)->data = NULL;						\
 									\
-	if (_bytes < KMALLOC_MAX_SIZE)					\
-		(fifo)->data = kmalloc(_bytes, (gfp));			\
-	if ((!(fifo)->data) && ((gfp) & GFP_KERNEL))			\
-		(fifo)->data = vmalloc(_bytes);				\
+	(fifo)->data = kvmalloc(_bytes, (gfp) & GFP_KERNEL);		\
 	(fifo)->data;							\
 })
 
diff --git a/drivers/net/ethernet/chelsio/cxgb3/cxgb3_defs.h b/drivers/net/ethernet/chelsio/cxgb3/cxgb3_defs.h
index 920d918ed193..f04e81f33795 100644
--- a/drivers/net/ethernet/chelsio/cxgb3/cxgb3_defs.h
+++ b/drivers/net/ethernet/chelsio/cxgb3/cxgb3_defs.h
@@ -41,9 +41,6 @@
 
 #define VALIDATE_TID 1
 
-void *cxgb_alloc_mem(unsigned long size);
-void cxgb_free_mem(void *addr);
-
 /*
  * Map an ATID or STID to their entries in the corresponding TID tables.
  */
diff --git a/drivers/net/ethernet/chelsio/cxgb3/cxgb3_offload.c b/drivers/net/ethernet/chelsio/cxgb3/cxgb3_offload.c
index 76684dcb874c..606d4a3ade04 100644
--- a/drivers/net/ethernet/chelsio/cxgb3/cxgb3_offload.c
+++ b/drivers/net/ethernet/chelsio/cxgb3/cxgb3_offload.c
@@ -1152,27 +1152,6 @@ static void cxgb_redirect(struct dst_entry *old, struct dst_entry *new,
 }
 
 /*
- * Allocate a chunk of memory using kmalloc or, if that fails, vmalloc.
- * The allocated memory is cleared.
- */
-void *cxgb_alloc_mem(unsigned long size)
-{
-	void *p = kzalloc(size, GFP_KERNEL | __GFP_NOWARN);
-
-	if (!p)
-		p = vzalloc(size);
-	return p;
-}
-
-/*
- * Free memory allocated through t3_alloc_mem().
- */
-void cxgb_free_mem(void *addr)
-{
-	kvfree(addr);
-}
-
-/*
  * Allocate and initialize the TID tables.  Returns 0 on success.
  */
 static int init_tid_tabs(struct tid_info *t, unsigned int ntids,
@@ -1182,7 +1161,7 @@ static int init_tid_tabs(struct tid_info *t, unsigned int ntids,
 	unsigned long size = ntids * sizeof(*t->tid_tab) +
 	    natids * sizeof(*t->atid_tab) + nstids * sizeof(*t->stid_tab);
 
-	t->tid_tab = cxgb_alloc_mem(size);
+	t->tid_tab = kvmalloc(size, GFP_KERNEL);
 	if (!t->tid_tab)
 		return -ENOMEM;
 
@@ -1218,7 +1197,7 @@ static int init_tid_tabs(struct tid_info *t, unsigned int ntids,
 
 static void free_tid_maps(struct tid_info *t)
 {
-	cxgb_free_mem(t->tid_tab);
+	kvfree(t->tid_tab);
 }
 
 static inline void add_adapter(struct adapter *adap)
diff --git a/drivers/net/ethernet/chelsio/cxgb3/l2t.c b/drivers/net/ethernet/chelsio/cxgb3/l2t.c
index 5f226eda8cd6..c9b06501ee0c 100644
--- a/drivers/net/ethernet/chelsio/cxgb3/l2t.c
+++ b/drivers/net/ethernet/chelsio/cxgb3/l2t.c
@@ -444,7 +444,7 @@ struct l2t_data *t3_init_l2t(unsigned int l2t_capacity)
 	struct l2t_data *d;
 	int i, size = sizeof(*d) + l2t_capacity * sizeof(struct l2t_entry);
 
-	d = cxgb_alloc_mem(size);
+	d = kvmalloc(size, GFP_KERNEL);
 	if (!d)
 		return NULL;
 
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
index 6f951877430b..671695cb3c15 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
@@ -881,27 +881,6 @@ static int setup_sge_queues(struct adapter *adap)
 	return err;
 }
 
-/*
- * Allocate a chunk of memory using kmalloc or, if that fails, vmalloc.
- * The allocated memory is cleared.
- */
-void *t4_alloc_mem(size_t size)
-{
-	void *p = kzalloc(size, GFP_KERNEL | __GFP_NOWARN);
-
-	if (!p)
-		p = vzalloc(size);
-	return p;
-}
-
-/*
- * Free memory allocated through alloc_mem().
- */
-void t4_free_mem(void *addr)
-{
-	kvfree(addr);
-}
-
 static u16 cxgb_select_queue(struct net_device *dev, struct sk_buff *skb,
 			     void *accel_priv, select_queue_fallback_t fallback)
 {
@@ -1300,7 +1279,7 @@ static int tid_init(struct tid_info *t)
 	       max_ftids * sizeof(*t->ftid_tab) +
 	       ftid_bmap_size * sizeof(long);
 
-	t->tid_tab = t4_alloc_mem(size);
+	t->tid_tab = kvmalloc(size, GFP_KERNEL);
 	if (!t->tid_tab)
 		return -ENOMEM;
 
@@ -3416,7 +3395,7 @@ static int adap_init0(struct adapter *adap)
 		/* allocate memory to read the header of the firmware on the
 		 * card
 		 */
-		card_fw = t4_alloc_mem(sizeof(*card_fw));
+		card_fw = kvmalloc(sizeof(*card_fw), GFP_KERNEL);
 
 		/* Get FW from from /lib/firmware/ */
 		ret = request_firmware(&fw, fw_info->fw_mod_name,
@@ -3436,7 +3415,7 @@ static int adap_init0(struct adapter *adap)
 
 		/* Cleaning up */
 		release_firmware(fw);
-		t4_free_mem(card_fw);
+		kvfree(card_fw);
 
 		if (ret < 0)
 			goto bye;
@@ -4432,9 +4411,9 @@ static void free_some_resources(struct adapter *adapter)
 {
 	unsigned int i;
 
-	t4_free_mem(adapter->l2t);
+	kvfree(adapter->l2t);
 	t4_cleanup_sched(adapter);
-	t4_free_mem(adapter->tids.tid_tab);
+	kvfree(adapter->tids.tid_tab);
 	cxgb4_cleanup_tc_u32(adapter);
 	kfree(adapter->sge.egr_map);
 	kfree(adapter->sge.ingr_map);
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
index 5886ad78058f..a5c1b815145e 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
@@ -70,13 +70,10 @@ int mlx4_en_create_tx_ring(struct mlx4_en_priv *priv,
 	ring->full_size = ring->size - HEADROOM - MAX_DESC_TXBBS;
 
 	tmp = size * sizeof(struct mlx4_en_tx_info);
-	ring->tx_info = kmalloc_node(tmp, GFP_KERNEL | __GFP_NOWARN, node);
+	ring->tx_info = kvmalloc_node(tmp, GFP_KERNEL, node);
 	if (!ring->tx_info) {
-		ring->tx_info = vmalloc(tmp);
-		if (!ring->tx_info) {
-			err = -ENOMEM;
-			goto err_ring;
-		}
+		err = -ENOMEM;
+		goto err_ring;
 	}
 
 	en_dbg(DRV, priv, "Allocated tx_info ring at addr:%p size:%d\n",
diff --git a/drivers/net/ethernet/mellanox/mlx4/mr.c b/drivers/net/ethernet/mellanox/mlx4/mr.c
index 395b5463cfd9..82354fd0a87e 100644
--- a/drivers/net/ethernet/mellanox/mlx4/mr.c
+++ b/drivers/net/ethernet/mellanox/mlx4/mr.c
@@ -115,12 +115,9 @@ static int mlx4_buddy_init(struct mlx4_buddy *buddy, int max_order)
 
 	for (i = 0; i <= buddy->max_order; ++i) {
 		s = BITS_TO_LONGS(1 << (buddy->max_order - i));
-		buddy->bits[i] = kcalloc(s, sizeof (long), GFP_KERNEL | __GFP_NOWARN);
-		if (!buddy->bits[i]) {
-			buddy->bits[i] = vzalloc(s * sizeof(long));
-			if (!buddy->bits[i])
-				goto err_out_free;
-		}
+		buddy->bits[i] = kvzalloc(s * sizeof(long), GFP_KERNEL);
+		if (!buddy->bits[i])
+			goto err_out_free;
 	}
 
 	set_bit(0, buddy->bits[buddy->max_order]);
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index 0eedc49e0d47..3bd332b167d9 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -102,10 +102,7 @@ int nvdimm_init_config_data(struct nvdimm_drvdata *ndd)
 		return -ENXIO;
 	}
 
-	ndd->data = kmalloc(ndd->nsarea.config_size, GFP_KERNEL);
-	if (!ndd->data)
-		ndd->data = vmalloc(ndd->nsarea.config_size);
-
+	ndd->data = kvmalloc(ndd->nsarea.config_size, GFP_KERNEL);
 	if (!ndd->data)
 		return -ENOMEM;
 
diff --git a/drivers/staging/lustre/lnet/libcfs/linux/linux-mem.c b/drivers/staging/lustre/lnet/libcfs/linux/linux-mem.c
index a6a76a681ea9..8f638267e704 100644
--- a/drivers/staging/lustre/lnet/libcfs/linux/linux-mem.c
+++ b/drivers/staging/lustre/lnet/libcfs/linux/linux-mem.c
@@ -45,15 +45,6 @@ EXPORT_SYMBOL(libcfs_kvzalloc);
 void *libcfs_kvzalloc_cpt(struct cfs_cpt_table *cptab, int cpt, size_t size,
 			  gfp_t flags)
 {
-	void *ret;
-
-	ret = kzalloc_node(size, flags | __GFP_NOWARN,
-			   cfs_cpt_spread_node(cptab, cpt));
-	if (!ret) {
-		WARN_ON(!(flags & (__GFP_FS | __GFP_HIGH)));
-		ret = vmalloc_node(size, cfs_cpt_spread_node(cptab, cpt));
-	}
-
-	return ret;
+	return kvzalloc_node(size, flags, cfs_cpt_spread_node(cptab, cpt));
 }
 EXPORT_SYMBOL(libcfs_kvzalloc_cpt);
diff --git a/drivers/xen/evtchn.c b/drivers/xen/evtchn.c
index 6890897a6f30..10f1ef582659 100644
--- a/drivers/xen/evtchn.c
+++ b/drivers/xen/evtchn.c
@@ -87,18 +87,6 @@ struct user_evtchn {
 	bool enabled;
 };
 
-static evtchn_port_t *evtchn_alloc_ring(unsigned int size)
-{
-	evtchn_port_t *ring;
-	size_t s = size * sizeof(*ring);
-
-	ring = kmalloc(s, GFP_KERNEL);
-	if (!ring)
-		ring = vmalloc(s);
-
-	return ring;
-}
-
 static void evtchn_free_ring(evtchn_port_t *ring)
 {
 	kvfree(ring);
@@ -334,7 +322,7 @@ static int evtchn_resize_ring(struct per_user_data *u)
 	else
 		new_size = 2 * u->ring_size;
 
-	new_ring = evtchn_alloc_ring(new_size);
+	new_ring = kvmalloc(new_size * sizeof(*new_ring), GFP_KERNEL);
 	if (!new_ring)
 		return -ENOMEM;
 
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 146b2dc0d2cf..4fc9712d927d 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -5391,13 +5391,10 @@ int btrfs_compare_trees(struct btrfs_root *left_root,
 		goto out;
 	}
 
-	tmp_buf = kmalloc(fs_info->nodesize, GFP_KERNEL | __GFP_NOWARN);
+	tmp_buf = kvmalloc(fs_info->nodesize, GFP_KERNEL);
 	if (!tmp_buf) {
-		tmp_buf = vmalloc(fs_info->nodesize);
-		if (!tmp_buf) {
-			ret = -ENOMEM;
-			goto out;
-		}
+		ret = -ENOMEM;
+		goto out;
 	}
 
 	left_path->search_commit_root = 1;
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 77dabfed3a5d..6f0b488c7428 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3547,12 +3547,9 @@ static int btrfs_clone(struct inode *src, struct inode *inode,
 	u64 last_dest_end = destoff;
 
 	ret = -ENOMEM;
-	buf = kmalloc(fs_info->nodesize, GFP_KERNEL | __GFP_NOWARN);
-	if (!buf) {
-		buf = vmalloc(fs_info->nodesize);
-		if (!buf)
-			return ret;
-	}
+	buf = kvmalloc(fs_info->nodesize, GFP_KERNEL);
+	if (!buf)
+		return ret;
 
 	path = btrfs_alloc_path();
 	if (!path) {
diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index d145ce804620..0621ca2a7b5d 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -6242,22 +6242,16 @@ long btrfs_ioctl_send(struct file *mnt_file, void __user *arg_)
 	sctx->clone_roots_cnt = arg->clone_sources_count;
 
 	sctx->send_max_size = BTRFS_SEND_BUF_SIZE;
-	sctx->send_buf = kmalloc(sctx->send_max_size, GFP_KERNEL | __GFP_NOWARN);
+	sctx->send_buf = kvmalloc(sctx->send_max_size, GFP_KERNEL);
 	if (!sctx->send_buf) {
-		sctx->send_buf = vmalloc(sctx->send_max_size);
-		if (!sctx->send_buf) {
-			ret = -ENOMEM;
-			goto out;
-		}
+		ret = -ENOMEM;
+		goto out;
 	}
 
-	sctx->read_buf = kmalloc(BTRFS_SEND_READ_SIZE, GFP_KERNEL | __GFP_NOWARN);
+	sctx->read_buf = kvmalloc(BTRFS_SEND_READ_SIZE, GFP_KERNEL);
 	if (!sctx->read_buf) {
-		sctx->read_buf = vmalloc(BTRFS_SEND_READ_SIZE);
-		if (!sctx->read_buf) {
-			ret = -ENOMEM;
-			goto out;
-		}
+		ret = -ENOMEM;
+		goto out;
 	}
 
 	sctx->pending_dir_moves = RB_ROOT;
@@ -6278,13 +6272,10 @@ long btrfs_ioctl_send(struct file *mnt_file, void __user *arg_)
 	alloc_size = arg->clone_sources_count * sizeof(*arg->clone_sources);
 
 	if (arg->clone_sources_count) {
-		clone_sources_tmp = kmalloc(alloc_size, GFP_KERNEL | __GFP_NOWARN);
+		clone_sources_tmp = kvmalloc(alloc_size, GFP_KERNEL);
 		if (!clone_sources_tmp) {
-			clone_sources_tmp = vmalloc(alloc_size);
-			if (!clone_sources_tmp) {
-				ret = -ENOMEM;
-				goto out;
-			}
+			ret = -ENOMEM;
+			goto out;
 		}
 
 		ret = copy_from_user(clone_sources_tmp, arg->clone_sources,
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 045d30d26624..78b18acf33ba 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -74,12 +74,9 @@ dio_get_pages_alloc(const struct iov_iter *it, size_t nbytes,
 	align = (unsigned long)(it->iov->iov_base + it->iov_offset) &
 		(PAGE_SIZE - 1);
 	npages = calc_pages_for(align, nbytes);
-	pages = kmalloc(sizeof(*pages) * npages, GFP_KERNEL);
-	if (!pages) {
-		pages = vmalloc(sizeof(*pages) * npages);
-		if (!pages)
-			return ERR_PTR(-ENOMEM);
-	}
+	pages = kvmalloc(sizeof(*pages) * npages, GFP_KERNEL);
+	if (!pages)
+		return ERR_PTR(-ENOMEM);
 
 	for (idx = 0; idx < npages; ) {
 		size_t start;
diff --git a/fs/select.c b/fs/select.c
index 305c0daf5d67..9e8e1189eb99 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -586,10 +586,7 @@ int core_sys_select(int n, fd_set __user *inp, fd_set __user *outp,
 			goto out_nofds;
 
 		alloc_size = 6 * size;
-		bits = kmalloc(alloc_size, GFP_KERNEL|__GFP_NOWARN);
-		if (!bits && alloc_size > PAGE_SIZE)
-			bits = vmalloc(alloc_size);
-
+		bits = kvmalloc(alloc_size, GFP_KERNEL);
 		if (!bits)
 			goto out_nofds;
 	}
diff --git a/fs/xattr.c b/fs/xattr.c
index 7e3317cf4045..4269a7c26db7 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -431,12 +431,9 @@ setxattr(struct dentry *d, const char __user *name, const void __user *value,
 	if (size) {
 		if (size > XATTR_SIZE_MAX)
 			return -E2BIG;
-		kvalue = kmalloc(size, GFP_KERNEL | __GFP_NOWARN);
-		if (!kvalue) {
-			kvalue = vmalloc(size);
-			if (!kvalue)
-				return -ENOMEM;
-		}
+		kvalue = kvmalloc(size, GFP_KERNEL);
+		if (!kvalue)
+			return -ENOMEM;
 		if (copy_from_user(kvalue, value, size)) {
 			error = -EFAULT;
 			goto out;
@@ -528,12 +525,9 @@ getxattr(struct dentry *d, const char __user *name, void __user *value,
 	if (size) {
 		if (size > XATTR_SIZE_MAX)
 			size = XATTR_SIZE_MAX;
-		kvalue = kzalloc(size, GFP_KERNEL | __GFP_NOWARN);
-		if (!kvalue) {
-			kvalue = vmalloc(size);
-			if (!kvalue)
-				return -ENOMEM;
-		}
+		kvalue = kvmalloc(size, GFP_KERNEL);
+		if (!kvalue)
+			return -ENOMEM;
 	}
 
 	error = vfs_getxattr(d, kname, kvalue, size);
@@ -611,12 +605,9 @@ listxattr(struct dentry *d, char __user *list, size_t size)
 	if (size) {
 		if (size > XATTR_LIST_MAX)
 			size = XATTR_LIST_MAX;
-		klist = kmalloc(size, __GFP_NOWARN | GFP_KERNEL);
-		if (!klist) {
-			klist = vmalloc(size);
-			if (!klist)
-				return -ENOMEM;
-		}
+		klist = kvmalloc(size, GFP_KERNEL);
+		if (!klist)
+			return -ENOMEM;
 	}
 
 	error = vfs_listxattr(d, klist, size);
diff --git a/kernel/bpf/hashtab.c b/kernel/bpf/hashtab.c
index 34debc1a9641..4ca30a951bbc 100644
--- a/kernel/bpf/hashtab.c
+++ b/kernel/bpf/hashtab.c
@@ -320,14 +320,9 @@ static struct bpf_map *htab_map_alloc(union bpf_attr *attr)
 		goto free_htab;
 
 	err = -ENOMEM;
-	htab->buckets = kmalloc_array(htab->n_buckets, sizeof(struct bucket),
-				      GFP_USER | __GFP_NOWARN);
-
-	if (!htab->buckets) {
-		htab->buckets = vmalloc(htab->n_buckets * sizeof(struct bucket));
-		if (!htab->buckets)
-			goto free_htab;
-	}
+	htab->buckets = kvmalloc(htab->n_buckets * sizeof(struct bucket), GFP_USER);
+	if (!htab->buckets)
+		goto free_htab;
 
 	for (i = 0; i < htab->n_buckets; i++) {
 		INIT_HLIST_HEAD(&htab->buckets[i].head);
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 25f572303801..45c17b5562b5 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -957,10 +957,7 @@ EXPORT_SYMBOL(iov_iter_get_pages);
 
 static struct page **get_pages_array(size_t n)
 {
-	struct page **p = kmalloc(n * sizeof(struct page *), GFP_KERNEL);
-	if (!p)
-		p = vmalloc(n * sizeof(struct page *));
-	return p;
+	return kvmalloc(n * sizeof(struct page *), GFP_KERNEL);
 }
 
 static ssize_t pipe_get_pages_alloc(struct iov_iter *i,
diff --git a/mm/frame_vector.c b/mm/frame_vector.c
index db77dcb38afd..72ebec18629c 100644
--- a/mm/frame_vector.c
+++ b/mm/frame_vector.c
@@ -200,10 +200,7 @@ struct frame_vector *frame_vector_create(unsigned int nr_frames)
 	 * Avoid higher order allocations, use vmalloc instead. It should
 	 * be rare anyway.
 	 */
-	if (size <= PAGE_SIZE)
-		vec = kmalloc(size, GFP_KERNEL);
-	else
-		vec = vmalloc(size);
+	vec = kvmalloc(size, GFP_KERNEL);
 	if (!vec)
 		return NULL;
 	vec->nr_allocated = nr_frames;
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index ca97835bfec4..a46a9fd8b540 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -687,11 +687,7 @@ int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo)
 		/* no more locks than number of hash buckets */
 		nblocks = min(nblocks, hashinfo->ehash_mask + 1);
 
-		hashinfo->ehash_locks =	kmalloc_array(nblocks, locksz,
-						      GFP_KERNEL | __GFP_NOWARN);
-		if (!hashinfo->ehash_locks)
-			hashinfo->ehash_locks = vmalloc(nblocks * locksz);
-
+		hashinfo->ehash_locks = kvmalloc(nblocks * locksz, GFP_KERNEL);
 		if (!hashinfo->ehash_locks)
 			return -ENOMEM;
 
diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c
index d46f4d5b1c62..39b2166d3be8 100644
--- a/net/ipv4/tcp_metrics.c
+++ b/net/ipv4/tcp_metrics.c
@@ -1155,10 +1155,7 @@ static int __net_init tcp_net_metrics_init(struct net *net)
 	tcp_metrics_hash_log = order_base_2(slots);
 	size = sizeof(struct tcpm_hash_bucket) << tcp_metrics_hash_log;
 
-	tcp_metrics_hash = kzalloc(size, GFP_KERNEL | __GFP_NOWARN);
-	if (!tcp_metrics_hash)
-		tcp_metrics_hash = vzalloc(size);
-
+	tcp_metrics_hash = kvzalloc(size, GFP_KERNEL);
 	if (!tcp_metrics_hash)
 		return -ENOMEM;
 
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
index 15fe97644ffe..a0c82ef74389 100644
--- a/net/mpls/af_mpls.c
+++ b/net/mpls/af_mpls.c
@@ -1525,10 +1525,7 @@ static int resize_platform_label_table(struct net *net, size_t limit)
 	unsigned index;
 
 	if (size) {
-		labels = kzalloc(size, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
-		if (!labels)
-			labels = vzalloc(size);
-
+		labels = kvzalloc(size, GFP_KERNEL);
 		if (!labels)
 			goto nolabels;
 	}
diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index a011322a027d..eeed0af3ea25 100644
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -712,17 +712,11 @@ EXPORT_SYMBOL(xt_check_entry_offsets);
  */
 unsigned int *xt_alloc_entry_offsets(unsigned int size)
 {
-	unsigned int *off;
-
-	off = kcalloc(size, sizeof(unsigned int), GFP_KERNEL | __GFP_NOWARN);
-
-	if (off)
-		return off;
-
 	if (size < (SIZE_MAX / sizeof(unsigned int)))
-		off = vmalloc(size * sizeof(unsigned int));
+		return kvmalloc(size * sizeof(unsigned int), GFP_KERNEL);
+
+	return NULL;
 
-	return off;
 }
 EXPORT_SYMBOL(xt_alloc_entry_offsets);
 
@@ -956,15 +950,9 @@ struct xt_table_info *xt_alloc_table_info(unsigned int size)
 	if ((SMP_ALIGN(size) >> PAGE_SHIFT) + 2 > totalram_pages)
 		return NULL;
 
-	if (sz <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER))
-		info = kmalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
-	if (!info) {
-		info = __vmalloc(sz, GFP_KERNEL | __GFP_NOWARN |
-				     __GFP_NORETRY | __GFP_HIGHMEM,
-				 PAGE_KERNEL);
-		if (!info)
-			return NULL;
-	}
+	info = kvmalloc(sz, GFP_KERNEL);
+	if (!info)
+		return NULL;
 	memset(info, 0, sizeof(*info));
 	info->size = size;
 	return info;
@@ -1066,7 +1054,7 @@ static int xt_jumpstack_alloc(struct xt_table_info *i)
 
 	size = sizeof(void **) * nr_cpu_ids;
 	if (size > PAGE_SIZE)
-		i->jumpstack = vzalloc(size);
+		i->jumpstack = kvzalloc(size, GFP_KERNEL);
 	else
 		i->jumpstack = kzalloc(size, GFP_KERNEL);
 	if (i->jumpstack == NULL)
@@ -1088,12 +1076,8 @@ static int xt_jumpstack_alloc(struct xt_table_info *i)
 	 */
 	size = sizeof(void *) * i->stacksize * 2u;
 	for_each_possible_cpu(cpu) {
-		if (size > PAGE_SIZE)
-			i->jumpstack[cpu] = vmalloc_node(size,
-				cpu_to_node(cpu));
-		else
-			i->jumpstack[cpu] = kmalloc_node(size,
-				GFP_KERNEL, cpu_to_node(cpu));
+		i->jumpstack[cpu] = kvmalloc_node(size, GFP_KERNEL,
+			cpu_to_node(cpu));
 		if (i->jumpstack[cpu] == NULL)
 			/*
 			 * Freeing will be done later on by the callers. The
diff --git a/net/netfilter/xt_recent.c b/net/netfilter/xt_recent.c
index 1d89a4eaf841..d6aa8f63ed2e 100644
--- a/net/netfilter/xt_recent.c
+++ b/net/netfilter/xt_recent.c
@@ -388,10 +388,7 @@ static int recent_mt_check(const struct xt_mtchk_param *par,
 	}
 
 	sz = sizeof(*t) + sizeof(t->iphash[0]) * ip_list_hash_size;
-	if (sz <= PAGE_SIZE)
-		t = kzalloc(sz, GFP_KERNEL);
-	else
-		t = vzalloc(sz);
+	t = kvzalloc(sz, GFP_KERNEL);
 	if (t == NULL) {
 		ret = -ENOMEM;
 		goto out;
diff --git a/net/sched/sch_choke.c b/net/sched/sch_choke.c
index 3b6d5bd69101..30d6a39fd2c8 100644
--- a/net/sched/sch_choke.c
+++ b/net/sched/sch_choke.c
@@ -431,10 +431,7 @@ static int choke_change(struct Qdisc *sch, struct nlattr *opt)
 	if (mask != q->tab_mask) {
 		struct sk_buff **ntab;
 
-		ntab = kcalloc(mask + 1, sizeof(struct sk_buff *),
-			       GFP_KERNEL | __GFP_NOWARN);
-		if (!ntab)
-			ntab = vzalloc((mask + 1) * sizeof(struct sk_buff *));
+		ntab = kvzalloc((mask + 1) * sizeof(struct sk_buff *), GFP_KERNEL);
 		if (!ntab)
 			return -ENOMEM;
 
diff --git a/net/sched/sch_fq_codel.c b/net/sched/sch_fq_codel.c
index a5ea0e9b6be4..04e2d006f277 100644
--- a/net/sched/sch_fq_codel.c
+++ b/net/sched/sch_fq_codel.c
@@ -449,27 +449,13 @@ static int fq_codel_change(struct Qdisc *sch, struct nlattr *opt)
 	return 0;
 }
 
-static void *fq_codel_zalloc(size_t sz)
-{
-	void *ptr = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN);
-
-	if (!ptr)
-		ptr = vzalloc(sz);
-	return ptr;
-}
-
-static void fq_codel_free(void *addr)
-{
-	kvfree(addr);
-}
-
 static void fq_codel_destroy(struct Qdisc *sch)
 {
 	struct fq_codel_sched_data *q = qdisc_priv(sch);
 
 	tcf_destroy_chain(&q->filter_list);
-	fq_codel_free(q->backlogs);
-	fq_codel_free(q->flows);
+	kvfree(q->backlogs);
+	kvfree(q->flows);
 }
 
 static int fq_codel_init(struct Qdisc *sch, struct nlattr *opt)
@@ -497,13 +483,13 @@ static int fq_codel_init(struct Qdisc *sch, struct nlattr *opt)
 	}
 
 	if (!q->flows) {
-		q->flows = fq_codel_zalloc(q->flows_cnt *
-					   sizeof(struct fq_codel_flow));
+		q->flows = kvmalloc(q->flows_cnt *
+					   sizeof(struct fq_codel_flow), GFP_KERNEL);
 		if (!q->flows)
 			return -ENOMEM;
-		q->backlogs = fq_codel_zalloc(q->flows_cnt * sizeof(u32));
+		q->backlogs = kvmalloc(q->flows_cnt * sizeof(u32), GFP_KERNEL);
 		if (!q->backlogs) {
-			fq_codel_free(q->flows);
+			kvfree(q->flows);
 			return -ENOMEM;
 		}
 		for (i = 0; i < q->flows_cnt; i++) {
diff --git a/net/sched/sch_hhf.c b/net/sched/sch_hhf.c
index e3d0458af17b..858b2de5db59 100644
--- a/net/sched/sch_hhf.c
+++ b/net/sched/sch_hhf.c
@@ -467,29 +467,14 @@ static void hhf_reset(struct Qdisc *sch)
 		rtnl_kfree_skbs(skb, skb);
 }
 
-static void *hhf_zalloc(size_t sz)
-{
-	void *ptr = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN);
-
-	if (!ptr)
-		ptr = vzalloc(sz);
-
-	return ptr;
-}
-
-static void hhf_free(void *addr)
-{
-	kvfree(addr);
-}
-
 static void hhf_destroy(struct Qdisc *sch)
 {
 	int i;
 	struct hhf_sched_data *q = qdisc_priv(sch);
 
 	for (i = 0; i < HHF_ARRAYS_CNT; i++) {
-		hhf_free(q->hhf_arrays[i]);
-		hhf_free(q->hhf_valid_bits[i]);
+		kvfree(q->hhf_arrays[i]);
+		kvfree(q->hhf_valid_bits[i]);
 	}
 
 	for (i = 0; i < HH_FLOWS_CNT; i++) {
@@ -503,7 +488,7 @@ static void hhf_destroy(struct Qdisc *sch)
 			kfree(flow);
 		}
 	}
-	hhf_free(q->hh_flows);
+	kvfree(q->hh_flows);
 }
 
 static const struct nla_policy hhf_policy[TCA_HHF_MAX + 1] = {
@@ -609,8 +594,8 @@ static int hhf_init(struct Qdisc *sch, struct nlattr *opt)
 
 	if (!q->hh_flows) {
 		/* Initialize heavy-hitter flow table. */
-		q->hh_flows = hhf_zalloc(HH_FLOWS_CNT *
-					 sizeof(struct list_head));
+		q->hh_flows = kvmalloc(HH_FLOWS_CNT *
+					 sizeof(struct list_head), GFP_KERNEL);
 		if (!q->hh_flows)
 			return -ENOMEM;
 		for (i = 0; i < HH_FLOWS_CNT; i++)
@@ -624,8 +609,8 @@ static int hhf_init(struct Qdisc *sch, struct nlattr *opt)
 
 		/* Initialize heavy-hitter filter arrays. */
 		for (i = 0; i < HHF_ARRAYS_CNT; i++) {
-			q->hhf_arrays[i] = hhf_zalloc(HHF_ARRAYS_LEN *
-						      sizeof(u32));
+			q->hhf_arrays[i] = kvmalloc(HHF_ARRAYS_LEN *
+						      sizeof(u32), GFP_KERNEL);
 			if (!q->hhf_arrays[i]) {
 				hhf_destroy(sch);
 				return -ENOMEM;
@@ -635,8 +620,8 @@ static int hhf_init(struct Qdisc *sch, struct nlattr *opt)
 
 		/* Initialize valid bits of heavy-hitter filter arrays. */
 		for (i = 0; i < HHF_ARRAYS_CNT; i++) {
-			q->hhf_valid_bits[i] = hhf_zalloc(HHF_ARRAYS_LEN /
-							  BITS_PER_BYTE);
+			q->hhf_valid_bits[i] = kvmalloc(HHF_ARRAYS_LEN /
+							  BITS_PER_BYTE, GFP_KERNEL);
 			if (!q->hhf_valid_bits[i]) {
 				hhf_destroy(sch);
 				return -ENOMEM;
diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index bcfadfdea8e0..08a3d2af1792 100644
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -692,15 +692,11 @@ static int get_dist_table(struct Qdisc *sch, const struct nlattr *attr)
 	spinlock_t *root_lock;
 	struct disttable *d;
 	int i;
-	size_t s;
 
 	if (n > NETEM_DIST_MAX)
 		return -EINVAL;
 
-	s = sizeof(struct disttable) + n * sizeof(s16);
-	d = kmalloc(s, GFP_KERNEL | __GFP_NOWARN);
-	if (!d)
-		d = vmalloc(s);
+	d = kvmalloc(sizeof(struct disttable) + n * sizeof(s16), GFP_KERNEL);
 	if (!d)
 		return -ENOMEM;
 
diff --git a/net/sched/sch_sfq.c b/net/sched/sch_sfq.c
index 7f195ed4d568..5d70cd6a032d 100644
--- a/net/sched/sch_sfq.c
+++ b/net/sched/sch_sfq.c
@@ -684,11 +684,7 @@ static int sfq_change(struct Qdisc *sch, struct nlattr *opt)
 
 static void *sfq_alloc(size_t sz)
 {
-	void *ptr = kmalloc(sz, GFP_KERNEL | __GFP_NOWARN);
-
-	if (!ptr)
-		ptr = vmalloc(sz);
-	return ptr;
+	return  kvmalloc(sz, GFP_KERNEL);
 }
 
 static void sfq_free(void *addr)
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index 38c00e867bda..a5c21f05ece4 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -99,14 +99,9 @@ SYSCALL_DEFINE5(add_key, const char __user *, _type,
 
 	if (_payload) {
 		ret = -ENOMEM;
-		payload = kmalloc(plen, GFP_KERNEL | __GFP_NOWARN);
-		if (!payload) {
-			if (plen <= PAGE_SIZE)
-				goto error2;
-			payload = vmalloc(plen);
-			if (!payload)
-				goto error2;
-		}
+		payload = kvmalloc(plen, GFP_KERNEL);
+		if (!payload)
+			goto error2;
 
 		ret = -EFAULT;
 		if (copy_from_user(payload, _payload, plen) != 0)
@@ -1064,14 +1059,9 @@ long keyctl_instantiate_key_common(key_serial_t id,
 
 	if (from) {
 		ret = -ENOMEM;
-		payload = kmalloc(plen, GFP_KERNEL);
-		if (!payload) {
-			if (plen <= PAGE_SIZE)
-				goto error;
-			payload = vmalloc(plen);
-			if (!payload)
-				goto error;
-		}
+		payload = kvmalloc(plen, GFP_KERNEL);
+		if (!payload)
+			goto error;
 
 		ret = -EFAULT;
 		if (!copy_from_iter_full(payload, plen, from))
-- 
2.11.0

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