Merge tag 'fallthrough-pseudo-keyword-5.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux

Pull 'fallthrough' keyword conversion from Gustavo A. R. Silva:
 "A tree-wide patch that replaces tons (2484) of /* fall through */
  comments, and its variants, with the new pseudo-keyword macro
  fallthrough[1]. Also, remove unnecessary fall-through markings when it
  is the case.

  There are currently 1167 intances of this fallthrough pseudo-keyword
  macro in mainline (5.9-rc2), that have been introduced over the last
  couple of development cycles:

    $ git grep -nw 'fallthrough;' | wc -l
    1167

  The global adoption of the fallthrough pseudo-keyword is something
  certain to happen; so, better sooner than later. :) This will also
  save everybody's time and thousands of lines of unnecessarily
  repetitive changelog text.

  After applying this patch on top of 5.9-rc2, we'll have a total of
  3651 instances of this macro:

    $ git grep -nw 'fallthrough;' | wc -l
    3651

  This treewide patch doesn't address ALL fall-through markings in all
  subsystems at once because I have previously sent out patches for some
  of such subsystems separately, and I will follow up on them; however,
  this definitely contributes most of the work needed to replace all the
  fall-through markings with the fallthrough pseudo-keyword macro in the
  whole codebase.

  I have build-tested this patch on 10 different architectures: x86_64,
  i386, arm64, powerpc, s390, sparc64, sh, m68k, powerpc64 and alpha
  (allyesconfig for all of them). This is in linux-next already and
  kernel test robot has also helped me to successfully build-test early
  versions of this patch[2][3][4][5]"

[1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through
[2] https://lore.kernel.org/lkml/5f3cc99a.HgvOW3rH0mD0RmkM%[email protected]/
[3] https://lore.kernel.org/lkml/5f3dd1d2.l1axczH+t4hMBZ63%[email protected]/
[4] https://lore.kernel.org/lkml/5f3e977a.mwYHUIObbR4SHr0B%[email protected]/
[5] https://lore.kernel.org/lkml/5f3f9e1c.qsyb%2FaySkiXNpkO4%[email protected]/

* tag 'fallthrough-pseudo-keyword-5.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux:
  treewide: Use fallthrough pseudo-keyword

6 files changed, 6 insertions, 6 deletions

diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index 0837ae0e0c5e..e731db900ee0 100644
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -1061,7 +1061,7 @@ static void b53_force_port_config(struct b53_device *dev, int port,
 	switch (speed) {
 	case 2000:
 		reg |= PORT_OVERRIDE_SPEED_2000M;
-		/* fallthrough */
+		fallthrough;
 	case SPEED_1000:
 		reg |= PORT_OVERRIDE_SPEED_1000M;
 		break;
diff --git a/drivers/net/dsa/b53/b53_serdes.c b/drivers/net/dsa/b53/b53_serdes.c
index 629bf14128a2..5ae3d9783b68 100644
--- a/drivers/net/dsa/b53/b53_serdes.c
+++ b/drivers/net/dsa/b53/b53_serdes.c
@@ -170,7 +170,7 @@ void b53_serdes_phylink_validate(struct b53_device *dev, int port,
 	switch (lane) {
 	case 0:
 		phylink_set(supported, 2500baseX_Full);
-		/* fallthrough */
+		fallthrough;
 	case 1:
 		phylink_set(supported, 1000baseX_Full);
 		break;
diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
index bafddb35f3a9..5ebff986a1ac 100644
--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -566,7 +566,7 @@ static void bcm_sf2_sw_mac_config(struct dsa_switch *ds, int port,
 	switch (state->interface) {
 	case PHY_INTERFACE_MODE_RGMII:
 		id_mode_dis = 1;
-		/* fallthrough */
+		fallthrough;
 	case PHY_INTERFACE_MODE_RGMII_TXID:
 		port_mode = EXT_GPHY;
 		break;
diff --git a/drivers/net/dsa/microchip/ksz9477.c b/drivers/net/dsa/microchip/ksz9477.c
index dc999406ce86..3cb22d149813 100644
--- a/drivers/net/dsa/microchip/ksz9477.c
+++ b/drivers/net/dsa/microchip/ksz9477.c
@@ -1083,7 +1083,7 @@ static phy_interface_t ksz9477_get_interface(struct ksz_device *dev, int port)
 		interface = PHY_INTERFACE_MODE_GMII;
 		if (gbit)
 			break;
-		/* fall through */
+		fallthrough;
 	case 0:
 		interface = PHY_INTERFACE_MODE_MII;
 		break;
diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 8dcb8a49ab67..0c37ddb58c1e 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -566,7 +566,7 @@ static void mt7530_setup_port5(struct dsa_switch *ds, phy_interface_t interface)
 	case P5_INTF_SEL_PHY_P0:
 		/* MT7530_P5_MODE_GPHY_P0: 2nd GMAC -> P5 -> P0 */
 		val |= MHWTRAP_PHY0_SEL;
-		/* fall through */
+		fallthrough;
 	case P5_INTF_SEL_PHY_P4:
 		/* MT7530_P5_MODE_GPHY_P4: 2nd GMAC -> P5 -> P4 */
 		val &= ~MHWTRAP_P5_MAC_SEL & ~MHWTRAP_P5_DIS;
diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 7a71c9902e73..f0dbc05e30a4 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -875,7 +875,7 @@ static uint64_t _mv88e6xxx_get_ethtool_stat(struct mv88e6xxx_chip *chip,
 		break;
 	case STATS_TYPE_BANK1:
 		reg = bank1_select;
-		/* fall through */
+		fallthrough;
 	case STATS_TYPE_BANK0:
 		reg |= s->reg | histogram;
 		mv88e6xxx_g1_stats_read(chip, reg, &low);