diff --git a/drivers/crypto/chelsio/chcr_crypto.h b/drivers/crypto/chelsio/chcr_crypto.h
index e89f9e0094b40b..c7816c83e32461 100644
--- a/drivers/crypto/chelsio/chcr_crypto.h
+++ b/drivers/crypto/chelsio/chcr_crypto.h
@@ -222,8 +222,10 @@ struct chcr_authenc_ctx {
 };
 
 struct __aead_ctx {
-	struct chcr_gcm_ctx gcm[0];
-	struct chcr_authenc_ctx authenc[];
+	union {
+		DECLARE_FLEX_ARRAY(struct chcr_gcm_ctx, gcm);
+		DECLARE_FLEX_ARRAY(struct chcr_authenc_ctx, authenc);
+	};
 };
 
 struct chcr_aead_ctx {
@@ -245,9 +247,11 @@ struct hmac_ctx {
 };
 
 struct __crypto_ctx {
-	struct hmac_ctx hmacctx[0];
-	struct ablk_ctx ablkctx[0];
-	struct chcr_aead_ctx aeadctx[];
+	union {
+		DECLARE_FLEX_ARRAY(struct hmac_ctx, hmacctx);
+		DECLARE_FLEX_ARRAY(struct ablk_ctx, ablkctx);
+		DECLARE_FLEX_ARRAY(struct chcr_aead_ctx, aeadctx);
+	};
 };
 
 struct chcr_context {
diff --git a/drivers/net/can/usb/etas_es58x/es581_4.h b/drivers/net/can/usb/etas_es58x/es581_4.h
index 4bc60a6df697dc..667ecb77168cc3 100644
--- a/drivers/net/can/usb/etas_es58x/es581_4.h
+++ b/drivers/net/can/usb/etas_es58x/es581_4.h
@@ -192,7 +192,7 @@ struct es581_4_urb_cmd {
 		struct es581_4_rx_cmd_ret rx_cmd_ret;
 		__le64 timestamp;
 		u8 rx_cmd_ret_u8;
-		u8 raw_msg[0];
+		DECLARE_FLEX_ARRAY(u8, raw_msg);
 	} __packed;
 
 	__le16 reserved_for_crc16_do_not_use;
diff --git a/drivers/net/can/usb/etas_es58x/es58x_fd.h b/drivers/net/can/usb/etas_es58x/es58x_fd.h
index a191891b877765..c4b19a6a33ae53 100644
--- a/drivers/net/can/usb/etas_es58x/es58x_fd.h
+++ b/drivers/net/can/usb/etas_es58x/es58x_fd.h
@@ -219,7 +219,7 @@ struct es58x_fd_urb_cmd {
 		struct es58x_fd_tx_ack_msg tx_ack_msg;
 		__le64 timestamp;
 		__le32 rx_cmd_ret_le32;
-		u8 raw_msg[0];
+		DECLARE_FLEX_ARRAY(u8, raw_msg);
 	} __packed;
 
 	__le16 reserved_for_crc16_do_not_use;
diff --git a/drivers/net/wireless/ath/ath10k/htt.h b/drivers/net/wireless/ath/ath10k/htt.h
index ec689e3ce48a7e..a6de08d3bf4a8f 100644
--- a/drivers/net/wireless/ath/ath10k/htt.h
+++ b/drivers/net/wireless/ath/ath10k/htt.h
@@ -1674,8 +1674,11 @@ struct htt_tx_fetch_ind {
 	__le32 token;
 	__le16 num_resp_ids;
 	__le16 num_records;
-	__le32 resp_ids[0]; /* ath10k_htt_get_tx_fetch_ind_resp_ids() */
-	struct htt_tx_fetch_record records[];
+	union {
+		/* ath10k_htt_get_tx_fetch_ind_resp_ids() */
+		DECLARE_FLEX_ARRAY(__le32, resp_ids);
+		DECLARE_FLEX_ARRAY(struct htt_tx_fetch_record, records);
+	};
 } __packed;
 
 static inline void *
diff --git a/drivers/net/wireless/intel/iwlegacy/commands.h b/drivers/net/wireless/intel/iwlegacy/commands.h
index 89c6671b32bcbf..4a97310f8feebf 100644
--- a/drivers/net/wireless/intel/iwlegacy/commands.h
+++ b/drivers/net/wireless/intel/iwlegacy/commands.h
@@ -1408,8 +1408,10 @@ struct il3945_tx_cmd {
 	 * MAC header goes here, followed by 2 bytes padding if MAC header
 	 * length is 26 or 30 bytes, followed by payload data
 	 */
-	u8 payload[0];
-	struct ieee80211_hdr hdr[];
+	union {
+		DECLARE_FLEX_ARRAY(u8, payload);
+		DECLARE_FLEX_ARRAY(struct ieee80211_hdr, hdr);
+	};
 } __packed;
 
 /*
diff --git a/drivers/net/wireless/intel/iwlwifi/dvm/commands.h b/drivers/net/wireless/intel/iwlwifi/dvm/commands.h
index 235c7a2e3483f1..75a4b8e26232c3 100644
--- a/drivers/net/wireless/intel/iwlwifi/dvm/commands.h
+++ b/drivers/net/wireless/intel/iwlwifi/dvm/commands.h
@@ -1251,8 +1251,10 @@ struct iwl_tx_cmd {
 	 * MAC header goes here, followed by 2 bytes padding if MAC header
 	 * length is 26 or 30 bytes, followed by payload data
 	 */
-	u8 payload[0];
-	struct ieee80211_hdr hdr[];
+	union {
+		DECLARE_FLEX_ARRAY(u8, payload);
+		DECLARE_FLEX_ARRAY(struct ieee80211_hdr, hdr);
+	};
 } __packed;
 
 /*
diff --git a/drivers/net/wireless/intel/iwlwifi/fw/api/tx.h b/drivers/net/wireless/intel/iwlwifi/fw/api/tx.h
index 24e4a82a55da1e..5fddfd39194142 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/api/tx.h
+++ b/drivers/net/wireless/intel/iwlwifi/fw/api/tx.h
@@ -239,8 +239,10 @@ struct iwl_tx_cmd {
 	u8 tid_tspec;
 	__le16 pm_frame_timeout;
 	__le16 reserved4;
-	u8 payload[0];
-	struct ieee80211_hdr hdr[0];
+	union {
+		DECLARE_FLEX_ARRAY(u8, payload);
+		DECLARE_FLEX_ARRAY(struct ieee80211_hdr, hdr);
+	};
 } __packed; /* TX_CMD_API_S_VER_6 */
 
 struct iwl_dram_sec_info {
@@ -713,8 +715,10 @@ struct iwl_mvm_compressed_ba_notif {
 	__le32 tx_rate;
 	__le16 tfd_cnt;
 	__le16 ra_tid_cnt;
-	struct iwl_mvm_compressed_ba_ratid ra_tid[0];
-	struct iwl_mvm_compressed_ba_tfd tfd[];
+	union {
+		DECLARE_FLEX_ARRAY(struct iwl_mvm_compressed_ba_ratid, ra_tid);
+		DECLARE_FLEX_ARRAY(struct iwl_mvm_compressed_ba_tfd, tfd);
+	};
 } __packed; /* COMPRESSED_BA_RES_API_S_VER_4 */
 
 /**
diff --git a/drivers/scsi/aic94xx/aic94xx_sds.c b/drivers/scsi/aic94xx/aic94xx_sds.c
index 46815e65f7a45a..5def83c88f130e 100644
--- a/drivers/scsi/aic94xx/aic94xx_sds.c
+++ b/drivers/scsi/aic94xx/aic94xx_sds.c
@@ -517,8 +517,10 @@ struct asd_ms_conn_map {
 	u8    num_nodes;
 	u8    usage_model_id;
 	u32   _resvd;
-	struct asd_ms_conn_desc conn_desc[0];
-	struct asd_ms_node_desc node_desc[];
+	union {
+		DECLARE_FLEX_ARRAY(struct asd_ms_conn_desc, conn_desc);
+		DECLARE_FLEX_ARRAY(struct asd_ms_node_desc, node_desc);
+	};
 } __attribute__ ((packed));
 
 struct asd_ctrla_phy_entry {
diff --git a/fs/hpfs/hpfs.h b/fs/hpfs/hpfs.h
index d92c4af3e1b43d..281dec8f636b32 100644
--- a/fs/hpfs/hpfs.h
+++ b/fs/hpfs/hpfs.h
@@ -409,10 +409,10 @@ struct bplus_header
   __le16 first_free;			/* offset from start of header to
 					   first free node in array */
   union {
-    struct bplus_internal_node internal[0]; /* (internal) 2-word entries giving
-					       subtree pointers */
-    struct bplus_leaf_node external[0];	    /* (external) 3-word entries giving
-					       sector runs */
+	/* (internal) 2-word entries giving subtree pointers */
+	DECLARE_FLEX_ARRAY(struct bplus_internal_node, internal);
+	/* (external) 3-word entries giving sector runs */
+	DECLARE_FLEX_ARRAY(struct bplus_leaf_node, external);
   } u;
 };
 
diff --git a/include/linux/filter.h b/include/linux/filter.h
index 4a93c12543ee28..4298c5e428a372 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -586,8 +586,10 @@ struct bpf_prog {
 	struct bpf_prog_aux	*aux;		/* Auxiliary fields */
 	struct sock_fprog_kern	*orig_prog;	/* Original BPF program */
 	/* Instructions for interpreter */
-	struct sock_filter	insns[0];
-	struct bpf_insn		insnsi[];
+	union {
+		DECLARE_FLEX_ARRAY(struct sock_filter, insns);
+		DECLARE_FLEX_ARRAY(struct bpf_insn, insnsi);
+	};
 };
 
 struct sk_filter {
diff --git a/include/scsi/sas.h b/include/scsi/sas.h
index 4726c1bbec6599..64154c1fed020f 100644
--- a/include/scsi/sas.h
+++ b/include/scsi/sas.h
@@ -323,8 +323,10 @@ struct ssp_response_iu {
 	__be32 sense_data_len;
 	__be32 response_data_len;
 
-	u8     resp_data[0];
-	u8     sense_data[];
+	union {
+		DECLARE_FLEX_ARRAY(u8, resp_data);
+		DECLARE_FLEX_ARRAY(u8, sense_data);
+	};
 } __attribute__ ((packed));
 
 struct ssp_command_iu {
@@ -554,8 +556,10 @@ struct ssp_response_iu {
 	__be32 sense_data_len;
 	__be32 response_data_len;
 
-	u8     resp_data[0];
-	u8     sense_data[];
+	union {
+		DECLARE_FLEX_ARRAY(u8, resp_data);
+		DECLARE_FLEX_ARRAY(u8, sense_data);
+	};
 } __attribute__ ((packed));
 
 struct ssp_command_iu {
diff --git a/include/uapi/rdma/rdma_user_rxe.h b/include/uapi/rdma/rdma_user_rxe.h
index e283c2220abaf1..7f44d54bb0abe1 100644
--- a/include/uapi/rdma/rdma_user_rxe.h
+++ b/include/uapi/rdma/rdma_user_rxe.h
@@ -141,8 +141,8 @@ struct rxe_dma_info {
 	__u32			sge_offset;
 	__u32			reserved;
 	union {
-		__u8		inline_data[0];
-		struct rxe_sge	sge[0];
+		__DECLARE_FLEX_ARRAY(__u8, inline_data);
+		__DECLARE_FLEX_ARRAY(struct rxe_sge, sge);
 	};
 };
 
diff --git a/include/uapi/sound/asoc.h b/include/uapi/sound/asoc.h
index da61398b1f8f3a..053949287ce893 100644
--- a/include/uapi/sound/asoc.h
+++ b/include/uapi/sound/asoc.h
@@ -240,8 +240,8 @@ struct snd_soc_tplg_vendor_array {
 struct snd_soc_tplg_private {
 	__le32 size;	/* in bytes of private data */
 	union {
-		char data[0];
-		struct snd_soc_tplg_vendor_array array[0];
+		__DECLARE_FLEX_ARRAY(char, data);
+		__DECLARE_FLEX_ARRAY(struct snd_soc_tplg_vendor_array, array);
 	};
 } __attribute__((packed));