target: remove obsolete kernel version switches for 4.19

This removes unneeded kernel version switches from the targets after
kernel 4.19 has been dropped.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

10 files changed, 2 insertions, 272 deletions

diff --git a/target/linux/ath79/files/drivers/mtd/nand/raw/ar934x_nand.c b/target/linux/ath79/files/drivers/mtd/nand/raw/ar934x_nand.c
index b35343c8d9..5f0026b475 100644
--- a/target/linux/ath79/files/drivers/mtd/nand/raw/ar934x_nand.c
+++ b/target/linux/ath79/files/drivers/mtd/nand/raw/ar934x_nand.c
@@ -631,19 +631,11 @@ static void ar934x_nfc_read_status(struct ar934x_nfc *nfc)
 		nfc->buf[0] = status;
 }
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 20, 0)
-static void ar934x_nfc_cmdfunc(struct mtd_info *mtd, unsigned int command,
-			       int column, int page_addr)
-{
-	struct ar934x_nfc *nfc = mtd_to_ar934x_nfc(mtd);
-	struct nand_chip *nand = &nfc->nand_chip;
-#else
 static void ar934x_nfc_cmdfunc(struct nand_chip *nand, unsigned int command,
 			       int column, int page_addr)
 {
 	struct mtd_info *mtd = nand_to_mtd(nand);
 	struct ar934x_nfc *nfc = nand->priv;
-#endif
 
 	nfc->read_id = false;
 	if (command != NAND_CMD_PAGEPROG)
@@ -748,28 +740,16 @@ static void ar934x_nfc_cmdfunc(struct nand_chip *nand, unsigned int command,
 	}
 }
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 20, 0)
-static int ar934x_nfc_dev_ready(struct mtd_info *mtd)
-{
-	struct ar934x_nfc *nfc = mtd_to_ar934x_nfc(mtd);
-#else
 static int ar934x_nfc_dev_ready(struct nand_chip *chip)
 {
 	struct ar934x_nfc *nfc = chip->priv;
-#endif
 
 	return __ar934x_nfc_dev_ready(nfc);
 }
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 20, 0)
-static u8 ar934x_nfc_read_byte(struct mtd_info *mtd)
-{
-	struct ar934x_nfc *nfc = mtd_to_ar934x_nfc(mtd);
-#else
 static u8 ar934x_nfc_read_byte(struct nand_chip *chip)
 {
 	struct ar934x_nfc *nfc = chip->priv;
-#endif
 	u8 data;
 
 	WARN_ON(nfc->buf_index >= nfc->buf_size);
@@ -784,15 +764,9 @@ static u8 ar934x_nfc_read_byte(struct nand_chip *chip)
 	return data;
 }
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 20, 0)
-static void ar934x_nfc_write_buf(struct mtd_info *mtd, const u8 *buf, int len)
-{
-	struct ar934x_nfc *nfc = mtd_to_ar934x_nfc(mtd);
-#else
 static void ar934x_nfc_write_buf(struct nand_chip *chip, const u8 *buf, int len)
 {
 	struct ar934x_nfc *nfc = chip->priv;
-#endif
 	int i;
 
 	WARN_ON(nfc->buf_index + len > nfc->buf_size);
@@ -810,15 +784,9 @@ static void ar934x_nfc_write_buf(struct nand_chip *chip, const u8 *buf, int len)
 	}
 }
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 20, 0)
-static void ar934x_nfc_read_buf(struct mtd_info *mtd, u8 *buf, int len)
-{
-	struct ar934x_nfc *nfc = mtd_to_ar934x_nfc(mtd);
-#else
 static void ar934x_nfc_read_buf(struct nand_chip *chip, u8 *buf, int len)
 {
 	struct ar934x_nfc *nfc = chip->priv;
-#endif
 	int buf_index;
 	int i;
 
@@ -853,18 +821,11 @@ static inline void ar934x_nfc_disable_hwecc(struct ar934x_nfc *nfc)
 	nfc->ctrl_reg |= AR934X_NFC_CTRL_CUSTOM_SIZE_EN;
 }
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 20, 0)
-static int ar934x_nfc_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
-			       int page)
-{
-	struct ar934x_nfc *nfc = mtd_to_ar934x_nfc(mtd);
-#else
 static int ar934x_nfc_read_oob(struct nand_chip *chip,
 			       int page)
 {
 	struct ar934x_nfc *nfc = chip->priv;
 	struct mtd_info *mtd = ar934x_nfc_to_mtd(nfc);
-#endif
 	int err;
 
 	nfc_dbg(nfc, "read_oob: page:%d\n", page);
@@ -879,18 +840,11 @@ static int ar934x_nfc_read_oob(struct nand_chip *chip,
 	return 0;
 }
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 20, 0)
-static int ar934x_nfc_write_oob(struct mtd_info *mtd, struct nand_chip *chip,
-				int page)
-{
-	struct ar934x_nfc *nfc = mtd_to_ar934x_nfc(mtd);
-#else
 static int ar934x_nfc_write_oob(struct nand_chip *chip,
 				int page)
 {
 	struct ar934x_nfc *nfc = chip->priv;
 	struct mtd_info *mtd = ar934x_nfc_to_mtd(nfc);
-#endif
 	nfc_dbg(nfc, "write_oob: page:%d\n", page);
 
 	memcpy(nfc->buf, chip->oob_poi, mtd->oobsize);
@@ -899,20 +853,12 @@ static int ar934x_nfc_write_oob(struct nand_chip *chip,
 				     page, mtd->oobsize);
 }
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 20, 0)
-static int ar934x_nfc_read_page_raw(struct mtd_info *mtd,
-				    struct nand_chip *chip, u8 *buf,
-				    int oob_required, int page)
-{
-	struct ar934x_nfc *nfc = mtd_to_ar934x_nfc(mtd);
-#else
 static int ar934x_nfc_read_page_raw(
 				    struct nand_chip *chip, u8 *buf,
 				    int oob_required, int page)
 {
 	struct ar934x_nfc *nfc = chip->priv;
 	struct mtd_info *mtd = ar934x_nfc_to_mtd(nfc);
-#endif
 	int len;
 	int err;
 
@@ -934,18 +880,11 @@ static int ar934x_nfc_read_page_raw(
 	return 0;
 }
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 20, 0)
-static int ar934x_nfc_read_page(struct mtd_info *mtd, struct nand_chip *chip,
-				u8 *buf, int oob_required, int page)
-{
-	struct ar934x_nfc *nfc = mtd_to_ar934x_nfc(mtd);
-#else
 static int ar934x_nfc_read_page(struct nand_chip *chip,
 				u8 *buf, int oob_required, int page)
 {
 	struct ar934x_nfc *nfc = chip->priv;
 	struct mtd_info *mtd = ar934x_nfc_to_mtd(nfc);
-#endif
 	u32 ecc_ctrl;
 	int max_bitflips = 0;
 	bool ecc_failed;
@@ -1014,20 +953,12 @@ static int ar934x_nfc_read_page(struct nand_chip *chip,
 	return max_bitflips;
 }
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 20, 0)
-static int ar934x_nfc_write_page_raw(struct mtd_info *mtd,
-				     struct nand_chip *chip, const u8 *buf,
-				     int oob_required, int page)
-{
-	struct ar934x_nfc *nfc = mtd_to_ar934x_nfc(mtd);
-#else
 static int ar934x_nfc_write_page_raw(
 				     struct nand_chip *chip, const u8 *buf,
 				     int oob_required, int page)
 {
 	struct ar934x_nfc *nfc = chip->priv;
 	struct mtd_info *mtd = ar934x_nfc_to_mtd(nfc);
-#endif
 	int len;
 
 	nfc_dbg(nfc, "write_page_raw: page:%d oob:%d\n", page, oob_required);
@@ -1043,18 +974,11 @@ static int ar934x_nfc_write_page_raw(
 	return ar934x_nfc_send_write(nfc, NAND_CMD_PAGEPROG, 0, page, len);
 }
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 20, 0)
-static int ar934x_nfc_write_page(struct mtd_info *mtd, struct nand_chip *chip,
-				 const u8 *buf, int oob_required, int page)
-{
-	struct ar934x_nfc *nfc = mtd_to_ar934x_nfc(mtd);
-#else
 static int ar934x_nfc_write_page(struct nand_chip *chip,
 				 const u8 *buf, int oob_required, int page)
 {
 	struct ar934x_nfc *nfc = chip->priv;
 	struct mtd_info *mtd = ar934x_nfc_to_mtd(nfc);
-#endif
 	int err;
 
 	nfc_dbg(nfc, "write_page: page:%d oob:%d\n", page, oob_required);
@@ -1062,11 +986,7 @@ static int ar934x_nfc_write_page(struct nand_chip *chip,
 	/* write OOB first */
 	if (oob_required &&
 	    !is_all_ff(chip->oob_poi, mtd->oobsize)) {
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 20, 0)
-		err = ar934x_nfc_write_oob(mtd, chip, page);
-#else
 		err = ar934x_nfc_write_oob(chip, page);
-#endif
 		if (err)
 			return err;
 	}
@@ -1176,11 +1096,7 @@ static int ar934x_nfc_init_tail(struct mtd_info *mtd)
 {
 	struct ar934x_nfc *nfc = mtd_to_ar934x_nfc(mtd);
 	struct nand_chip *chip = &nfc->nand_chip;
-#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
-	u64 chipsize = chip->chipsize;
-#else
 	u64 chipsize = nanddev_target_size(&chip->base);
-#endif
 	u32 ctrl;
 	u32 t;
 	int err;
@@ -1427,13 +1343,8 @@ static int ar934x_nfc_attach_chip(struct nand_chip *nand)
 
 static u64 ar934x_nfc_dma_mask = DMA_BIT_MASK(32);
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 20, 0)
-static void ar934x_nfc_cmd_ctrl(struct mtd_info *mtd, int dat,
-				unsigned int ctrl)
-#else
 static void ar934x_nfc_cmd_ctrl(struct nand_chip *chip, int dat,
 				unsigned int ctrl)
-#endif
 {
 	WARN_ON(dat != NAND_CMD_NONE);
 }
@@ -1504,15 +1415,6 @@ static int ar934x_nfc_probe(struct platform_device *pdev)
 
 	nand_set_controller_data(nand, nfc);
 	nand_set_flash_node(nand, pdev->dev.of_node);
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 20, 0)
-	nand->chip_delay = 25;
-	nand->dev_ready = ar934x_nfc_dev_ready;
-	nand->cmdfunc = ar934x_nfc_cmdfunc;
-	nand->cmd_ctrl = ar934x_nfc_cmd_ctrl;	/* dummy */
-	nand->read_byte = ar934x_nfc_read_byte;
-	nand->write_buf = ar934x_nfc_write_buf;
-	nand->read_buf = ar934x_nfc_read_buf;
-#else
 	nand->legacy.chip_delay = 25;
 	nand->legacy.dev_ready = ar934x_nfc_dev_ready;
 	nand->legacy.cmdfunc = ar934x_nfc_cmdfunc;
@@ -1520,7 +1422,6 @@ static int ar934x_nfc_probe(struct platform_device *pdev)
 	nand->legacy.read_byte = ar934x_nfc_read_byte;
 	nand->legacy.write_buf = ar934x_nfc_write_buf;
 	nand->legacy.read_buf = ar934x_nfc_read_buf;
-#endif
 	nand->ecc.mode = NAND_ECC_HW;	/* default */
 	nand->priv = nfc;
 	platform_set_drvdata(pdev, nfc);
@@ -1535,16 +1436,8 @@ static int ar934x_nfc_probe(struct platform_device *pdev)
 		goto err_free_buf;
 	}
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 19, 130)
-	nand->dummy_controller.ops = &ar934x_nfc_controller_ops;
-	ret = nand_scan(mtd, 1);
-#elif LINUX_VERSION_CODE < KERNEL_VERSION(4, 20, 0)
-	nand->dummy_controller.ops = &ar934x_nfc_controller_ops;
-	ret = nand_scan(nand, 1);
-#else
 	nand->legacy.dummy_controller.ops = &ar934x_nfc_controller_ops;
 	ret = nand_scan(nand, 1);
-#endif
 	if (ret) {
 		dev_err(&pdev->dev, "nand_scan failed, err:%d\n", ret);
 		goto err_free_buf;
@@ -1566,9 +1459,6 @@ err_free_buf:
 static int ar934x_nfc_remove(struct platform_device *pdev)
 {
 	struct ar934x_nfc *nfc;
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 20, 0)
-	struct mtd_info *mtd;
-#endif
 
 	nfc = platform_get_drvdata(pdev);
 	if (nfc) {
diff --git a/target/linux/ath79/files/drivers/mtd/nand/raw/nand_rb4xx.c b/target/linux/ath79/files/drivers/mtd/nand/raw/nand_rb4xx.c
index 382af09978..50bd69f6a4 100644
--- a/target/linux/ath79/files/drivers/mtd/nand/raw/nand_rb4xx.c
+++ b/target/linux/ath79/files/drivers/mtd/nand/raw/nand_rb4xx.c
@@ -81,15 +81,9 @@ static const struct mtd_ooblayout_ops rb4xx_nand_ecclayout_ops = {
 	.free = rb4xx_ooblayout_free,
 };
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0)
-static uint8_t rb4xx_nand_read_byte(struct mtd_info *mtd)
-{
-	struct rb4xx_nand *nand = mtd->priv;
-#else
 static u8 rb4xx_nand_read_byte(struct nand_chip *chip)
 {
 	struct rb4xx_nand *nand = chip->priv;
-#endif
 	struct rb4xx_cpld *cpld = nand->cpld;
 	u8 data;
 	int ret;
@@ -101,45 +95,26 @@ static u8 rb4xx_nand_read_byte(struct nand_chip *chip)
 	return data;
 }
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0)
-static void rb4xx_nand_write_buf(struct mtd_info *mtd, const uint8_t *buf,
-				 int len)
-{
-	struct rb4xx_nand *nand = mtd->priv;
-#else
 static void rb4xx_nand_write_buf(struct nand_chip *chip, const u8 *buf, int len)
 {
 	struct rb4xx_nand *nand = chip->priv;
-#endif
 	struct rb4xx_cpld *cpld = nand->cpld;
 
 	cpld->write_nand(cpld, buf, len);
 }
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0)
-static void rb4xx_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
-{
-	struct rb4xx_nand *nand = mtd->priv;
-#else
 static void rb4xx_nand_read_buf(struct nand_chip *chip, u8 *buf, int len)
 {
 	struct rb4xx_nand *nand = chip->priv;
-#endif
 	struct rb4xx_cpld *cpld = nand->cpld;
 
 	cpld->read_nand(cpld, buf, len);
 }
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0)
-static void rb4xx_nand_cmd_ctrl(struct mtd_info *mtd, int dat, unsigned int ctrl)
-{
-	struct rb4xx_nand *nand = mtd->priv;
-#else
 static void rb4xx_nand_cmd_ctrl(struct nand_chip *chip, int dat,
 				unsigned int ctrl)
 {
 	struct rb4xx_nand *nand = chip->priv;
-#endif
 	struct rb4xx_cpld *cpld = nand->cpld;
 	u8 data = dat;
 
@@ -153,15 +128,9 @@ static void rb4xx_nand_cmd_ctrl(struct nand_chip *chip, int dat,
 		cpld->write_nand(cpld, &data, 1);
 }
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0)
-static int rb4xx_nand_dev_ready(struct mtd_info *mtd)
-{
-	struct rb4xx_nand *nand = mtd->priv;
-#else
 static int rb4xx_nand_dev_ready(struct nand_chip *chip)
 {
 	struct rb4xx_nand *nand = chip->priv;
-#endif
 
 	return gpiod_get_value_cansleep(nand->rdy);
 }
@@ -224,20 +193,6 @@ static int rb4xx_nand_probe(struct platform_device *pdev)
 	nand->chip.options	= NAND_NO_SUBPAGE_WRITE;
 	nand->chip.priv		= nand;
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0)
-	nand->chip.read_byte	= rb4xx_nand_read_byte;
-	nand->chip.write_buf	= rb4xx_nand_write_buf;
-	nand->chip.read_buf	= rb4xx_nand_read_buf;
-	nand->chip.cmd_ctrl	= rb4xx_nand_cmd_ctrl;
-	nand->chip.dev_ready	= rb4xx_nand_dev_ready;
-	nand->chip.chip_delay	= 25;
-
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4,19,130)
-	ret = nand_scan(mtd, 1);
-#else
-	ret = nand_scan(&nand->chip, 1);
-#endif
-#else
 	nand->chip.legacy.read_byte	= rb4xx_nand_read_byte;
 	nand->chip.legacy.write_buf	= rb4xx_nand_write_buf;
 	nand->chip.legacy.read_buf	= rb4xx_nand_read_buf;
@@ -246,7 +201,6 @@ static int rb4xx_nand_probe(struct platform_device *pdev)
 	nand->chip.legacy.chip_delay	= 25;
 
 	ret = nand_scan(&nand->chip, 1);
-#endif
 	if (ret)
 		return -ENXIO;
 
diff --git a/target/linux/generic/files/drivers/net/phy/adm6996.c b/target/linux/generic/files/drivers/net/phy/adm6996.c
index cce95f563b..66013f273d 100644
--- a/target/linux/generic/files/drivers/net/phy/adm6996.c
+++ b/target/linux/generic/files/drivers/net/phy/adm6996.c
@@ -1048,14 +1048,9 @@ static int adm6996_config_init(struct phy_device *pdev)
 	struct adm6996_priv *priv;
 	int ret;
 
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
 	linkmode_zero(pdev->supported);
 	linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, pdev->supported);
 	linkmode_copy(pdev->advertising, pdev->supported);
-#else
-	pdev->supported = ADVERTISED_100baseT_Full;
-	pdev->advertising = ADVERTISED_100baseT_Full;
-#endif
 
 	if (pdev->mdio.addr != 0) {
 		pr_info ("%s: PHY overlaps ADM6996, providing fixed PHY 0x%x.\n"
diff --git a/target/linux/generic/files/drivers/net/phy/ar8216.c b/target/linux/generic/files/drivers/net/phy/ar8216.c
index 18a455b21a..0b0348bfdf 100644
--- a/target/linux/generic/files/drivers/net/phy/ar8216.c
+++ b/target/linux/generic/files/drivers/net/phy/ar8216.c
@@ -2496,10 +2496,7 @@ ar8xxx_phy_read_status(struct phy_device *phydev)
 	struct switch_port_link link;
 
 	/* check for switch port link changes */
-#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 1, 0)
-	if (phydev->state == PHY_CHANGELINK)
-#endif
-		ar8xxx_check_link_states(priv);
+	ar8xxx_check_link_states(priv);
 
 	if (phydev->mdio.addr != 0)
 		return genphy_read_status(phydev);
@@ -2639,22 +2636,12 @@ found:
 	priv->use_count++;
 
 	if (phydev->mdio.addr == 0) {
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
 		linkmode_zero(phydev->supported);
 		if (ar8xxx_has_gige(priv))
 			linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, phydev->supported);
 		else
 			linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, phydev->supported);
 		linkmode_copy(phydev->advertising, phydev->supported);
-#else
-		if (ar8xxx_has_gige(priv)) {
-			phydev->supported = SUPPORTED_1000baseT_Full;
-			phydev->advertising = ADVERTISED_1000baseT_Full;
-		} else {
-			phydev->supported = SUPPORTED_100baseT_Full;
-			phydev->advertising = ADVERTISED_100baseT_Full;
-		}
-#endif
 
 		if (priv->chip->config_at_probe) {
 			priv->phy = phydev;
@@ -2665,14 +2652,9 @@ found:
 		}
 	} else {
 		if (ar8xxx_has_gige(priv)) {
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
 			linkmode_zero(phydev->supported);
 			linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, phydev->supported);
 			linkmode_copy(phydev->advertising, phydev->supported);
-#else
-			phydev->supported |= SUPPORTED_1000baseT_Full;
-			phydev->advertising |= ADVERTISED_1000baseT_Full;
-#endif
 		}
 		if (priv->chip->phy_rgmii_set)
 			priv->chip->phy_rgmii_set(priv, phydev);
diff --git a/target/linux/generic/files/drivers/net/phy/b53/b53_mdio.c b/target/linux/generic/files/drivers/net/phy/b53/b53_mdio.c
index 5675232bef..afe2187cd6 100644
--- a/target/linux/generic/files/drivers/net/phy/b53/b53_mdio.c
+++ b/target/linux/generic/files/drivers/net/phy/b53/b53_mdio.c
@@ -294,7 +294,6 @@ static int b53_phy_probe(struct phy_device *phydev)
 	if (ret)
 		return ret;
 
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
 	linkmode_zero(phydev->supported);
 	if (is5325(dev) || is5365(dev))
 		linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, phydev->supported);
@@ -302,14 +301,6 @@ static int b53_phy_probe(struct phy_device *phydev)
 		linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, phydev->supported);
 
 	linkmode_copy(phydev->advertising, phydev->supported);
-#else
-	if (is5325(dev) || is5365(dev))
-		phydev->supported = SUPPORTED_100baseT_Full;
-	else
-		phydev->supported = SUPPORTED_1000baseT_Full;
-
-	phydev->advertising = phydev->supported;
-#endif
 
 	ret = b53_switch_register(dev);
 	if (ret) {
diff --git a/target/linux/generic/files/drivers/net/phy/mvswitch.c b/target/linux/generic/files/drivers/net/phy/mvswitch.c
index 50a73e2f33..bd3b9e1ad1 100644
--- a/target/linux/generic/files/drivers/net/phy/mvswitch.c
+++ b/target/linux/generic/files/drivers/net/phy/mvswitch.c
@@ -208,14 +208,9 @@ mvswitch_config_init(struct phy_device *pdev)
 		return -EINVAL;
 
 	printk("%s: Marvell 88E6060 PHY driver attached.\n", dev->name);
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
 	linkmode_zero(pdev->supported);
 	linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, pdev->supported);
 	linkmode_copy(pdev->advertising, pdev->supported);
-#else
-	pdev->supported = ADVERTISED_100baseT_Full;
-	pdev->advertising = ADVERTISED_100baseT_Full;
-#endif
 	dev->phy_ptr = priv;
 	pdev->irq = PHY_POLL;
 #ifdef HEADER_MODE
diff --git a/target/linux/generic/files/drivers/net/phy/psb6970.c b/target/linux/generic/files/drivers/net/phy/psb6970.c
index 97fb62ace2..6cee75734b 100644
--- a/target/linux/generic/files/drivers/net/phy/psb6970.c
+++ b/target/linux/generic/files/drivers/net/phy/psb6970.c
@@ -326,13 +326,9 @@ static int psb6970_config_init(struct phy_device *pdev)
 		return 0;
 	}
 
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
 	linkmode_zero(pdev->supported);
 	linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, pdev->supported);
 	linkmode_copy(pdev->advertising, pdev->supported);
-#else
-	pdev->supported = pdev->advertising = SUPPORTED_100baseT_Full;
-#endif
 
 	mutex_init(&priv->reg_mutex);
 	priv->read = psb6970_mii_read;
diff --git a/target/linux/generic/files/drivers/net/phy/swconfig.c b/target/linux/generic/files/drivers/net/phy/swconfig.c
index 38fdab2d5c..a734e57608 100644
--- a/target/linux/generic/files/drivers/net/phy/swconfig.c
+++ b/target/linux/generic/files/drivers/net/phy/swconfig.c
@@ -591,13 +591,8 @@ swconfig_parse_ports(struct sk_buff *msg, struct nlattr *head,
 
 		port = &val->value.ports[val->len];
 
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,2,0)
 		if (nla_parse_nested_deprecated(tb, SWITCH_PORT_ATTR_MAX, nla,
 				port_policy, NULL))
-#else
-		if (nla_parse_nested(tb, SWITCH_PORT_ATTR_MAX, nla,
-				port_policy, NULL))
-#endif
 			return -EINVAL;
 
 		if (!tb[SWITCH_PORT_ID])
@@ -618,11 +613,7 @@ swconfig_parse_link(struct sk_buff *msg, struct nlattr *nla,
 {
 	struct nlattr *tb[SWITCH_LINK_ATTR_MAX + 1];
 
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,2,0)
 	if (nla_parse_nested_deprecated(tb, SWITCH_LINK_ATTR_MAX, nla, link_policy, NULL))
-#else
-	if (nla_parse_nested(tb, SWITCH_LINK_ATTR_MAX, nla, link_policy, NULL))
-#endif
 		return -EINVAL;
 
 	link->duplex = !!tb[SWITCH_LINK_FLAG_DUPLEX];
@@ -1000,106 +991,56 @@ swconfig_done(struct netlink_callback *cb)
 static struct genl_ops swconfig_ops[] = {
 	{
 		.cmd = SWITCH_CMD_LIST_GLOBAL,
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,2,0)
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-#endif
 		.doit = swconfig_list_attrs,
-#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
-		.policy = switch_policy,
-#endif
 	},
 	{
 		.cmd = SWITCH_CMD_LIST_VLAN,
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,2,0)
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-#endif
 		.doit = swconfig_list_attrs,
-#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
-		.policy = switch_policy,
-#endif
 	},
 	{
 		.cmd = SWITCH_CMD_LIST_PORT,
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,2,0)
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-#endif
 		.doit = swconfig_list_attrs,
-#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
-		.policy = switch_policy,
-#endif
 	},
 	{
 		.cmd = SWITCH_CMD_GET_GLOBAL,
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,2,0)
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-#endif
 		.doit = swconfig_get_attr,
-#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
-		.policy = switch_policy,
-#endif
 	},
 	{
 		.cmd = SWITCH_CMD_GET_VLAN,
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,2,0)
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-#endif
 		.doit = swconfig_get_attr,
-#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
-		.policy = switch_policy,
-#endif
 	},
 	{
 		.cmd = SWITCH_CMD_GET_PORT,
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,2,0)
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-#endif
 		.doit = swconfig_get_attr,
-#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
-		.policy = switch_policy,
-#endif
 	},
 	{
 		.cmd = SWITCH_CMD_SET_GLOBAL,
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,2,0)
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-#endif
 		.flags = GENL_ADMIN_PERM,
 		.doit = swconfig_set_attr,
-#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
-		.policy = switch_policy,
-#endif
 	},
 	{
 		.cmd = SWITCH_CMD_SET_VLAN,
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,2,0)
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-#endif
 		.flags = GENL_ADMIN_PERM,
 		.doit = swconfig_set_attr,
-#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
-		.policy = switch_policy,
-#endif
 	},
 	{
 		.cmd = SWITCH_CMD_SET_PORT,
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,2,0)
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-#endif
 		.flags = GENL_ADMIN_PERM,
 		.doit = swconfig_set_attr,
-#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
-		.policy = switch_policy,
-#endif
 	},
 	{
 		.cmd = SWITCH_CMD_GET_SWITCH,
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,2,0)
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
-#endif
 		.dumpit = swconfig_dump_switches,
-#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
-		.policy = switch_policy,
-#endif
 		.done = swconfig_done,
 	}
 };
@@ -1109,9 +1050,7 @@ static struct genl_family switch_fam = {
 	.hdrsize = 0,
 	.version = 1,
 	.maxattr = SWITCH_ATTR_MAX,
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0)
 	.policy = switch_policy,
-#endif
 	.module = THIS_MODULE,
 	.ops = swconfig_ops,
 	.n_ops = ARRAY_SIZE(swconfig_ops),
diff --git a/target/linux/generic/files/drivers/net/phy/swconfig_leds.c b/target/linux/generic/files/drivers/net/phy/swconfig_leds.c
index e982cb7b58..df53e5cd4a 100644
--- a/target/linux/generic/files/drivers/net/phy/swconfig_leds.c
+++ b/target/linux/generic/files/drivers/net/phy/swconfig_leds.c
@@ -321,14 +321,6 @@ err_free:
 	return err;
 }
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4,19,0)
-static void
-swconfig_trig_activate_void(struct led_classdev *led_cdev)
-{
-	swconfig_trig_activate(led_cdev);
-}
-#endif
-
 static void
 swconfig_trig_deactivate(struct led_classdev *led_cdev)
 {
@@ -523,11 +515,7 @@ swconfig_create_led_trigger(struct switch_dev *swdev)
 
 	sw_trig->swdev = swdev;
 	sw_trig->trig.name = swdev->devname;
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4,19,0)
-	sw_trig->trig.activate = swconfig_trig_activate_void;
-#else
 	sw_trig->trig.activate = swconfig_trig_activate;
-#endif
 	sw_trig->trig.deactivate = swconfig_trig_deactivate;
 
 	INIT_DELAYED_WORK(&sw_trig->sw_led_work, swconfig_led_work_func);
diff --git a/target/linux/generic/files/drivers/platform/mikrotik/rb_softconfig.c b/target/linux/generic/files/drivers/platform/mikrotik/rb_softconfig.c
index 51a178ec7c..54e263df8c 100644
--- a/target/linux/generic/files/drivers/platform/mikrotik/rb_softconfig.c
+++ b/target/linux/generic/files/drivers/platform/mikrotik/rb_softconfig.c
@@ -64,7 +64,7 @@
  * Also make the driver act read-only if 4K_SECTORS are not enabled, since they
  * are require to handle partial erasing of the small soft_config partition.
  */
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 17, 0)) && defined(CONFIG_MTD_SPI_NOR_USE_4K_SECTORS)
+#if defined(CONFIG_MTD_SPI_NOR_USE_4K_SECTORS)
  #define RB_SC_HAS_WRITE_SUPPORT	true
  #define RB_SC_WMODE			S_IWUSR
  #define RB_SC_RMODE			S_IRUSR