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gdbstub: mark expected switch fall-throughs

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In preparation to enabling -Wimplicit-fallthrough, mark switch
cases where we are expecting to fall through.

This patch fixes the following warnings:

kernel/debug/gdbstub.c: In function ‘gdb_serial_stub’:
kernel/debug/gdbstub.c:1031:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
    if (remcom_in_buffer[1] == '\0') {
       ^
kernel/debug/gdbstub.c:1036:3: note: here
   case 'C': /* Exception passing */
   ^~~~
kernel/debug/gdbstub.c:1040:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
    if (tmp == 0)
       ^
kernel/debug/gdbstub.c:1043:3: note: here
   case 'c': /* Continue packet */
   ^~~~
kernel/debug/gdbstub.c:1050:4: warning: this statement may fall through [-Wimplicit-fallthrough=]
    dbg_activate_sw_breakpoints();
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/debug/gdbstub.c:1052:3: note: here
   default:
   ^~~~~~~

Warning level 3 was used: -Wimplicit-fallthrough=3

Notice that, in this particular case, the code comment is modified
in accordance with what GCC is expecting to find.

This patch is part of the ongoing efforts to enable
-Wimplicit-fallthrough.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Acked-by: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
This commit is contained in:
Gustavo A. R. Silva 2019-02-26 13:16:14 -06:00 committed by Daniel Thompson
parent dc4060a5dc
commit a5d5092c92
1 changed files with 3 additions and 2 deletions
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5
kernel/debug/gdbstub.c
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@ -1033,13 +1033,14 @@ int gdb_serial_stub(struct kgdb_state *ks)
return DBG_PASS_EVENT;
}
#endif
/* Fall through */
case 'C': /* Exception passing */
tmp = gdb_cmd_exception_pass(ks);
if (tmp > 0)
goto default_handle;
if (tmp == 0)
break;
/* Fall through on tmp < 0 */
/* Fall through - on tmp < 0 */
case 'c': /* Continue packet */
case 's': /* Single step packet */
if (kgdb_contthread && kgdb_contthread != current) {
@ -1048,7 +1049,7 @@ int gdb_serial_stub(struct kgdb_state *ks)
break;
}
dbg_activate_sw_breakpoints();
/* Fall through to default processing */
/* Fall through - to default processing */
default:
default_handle:
error = kgdb_arch_handle_exception(ks->ex_vector,