sh: kernel: disassemble: Mark expected switch fall-throughs

Remove logically dead code and mark switch cases where we are expecting
to fall through.

Fix the following warnings (Building: defconfig sh):

arch/sh/kernel/disassemble.c:478:8: warning: this statement may fall
through [-Wimplicit-fallthrough=]
arch/sh/kernel/disassemble.c:487:8: warning: this statement may fall
through [-Wimplicit-fallthrough=]
arch/sh/kernel/disassemble.c:496:8: warning: this statement may fall
through [-Wimplicit-fallthrough=]

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/arch/sh/kernel/disassemble.c b/arch/sh/kernel/disassemble.c
index defebf1a9c8a..845543780cc5 100644
--- a/arch/sh/kernel/disassemble.c
+++ b/arch/sh/kernel/disassemble.c
@@ -475,8 +475,6 @@ static void print_sh_insn(u32 memaddr, u16 insn)
                                 printk("dbr");
                                 break;
                         case FD_REG_N:
-                                if (0)
-                                        goto d_reg_n;
                         case F_REG_N:
                                 printk("fr%d", rn);
                                 break;
@@ -488,7 +486,7 @@ static void print_sh_insn(u32 memaddr, u16 insn)
                                         printk("xd%d", rn & ~1);
                                         break;
                                 }
-                        d_reg_n:
+                                /* else, fall through */
                         case D_REG_N:
                                 printk("dr%d", rn);
                                 break;
@@ -497,6 +495,7 @@ static void print_sh_insn(u32 memaddr, u16 insn)
                                         printk("xd%d", rm & ~1);
                                         break;
                                 }
+                                /* else, fall through */
                         case D_REG_M:
                                 printk("dr%d", rm);
                                 break;