[PATCH] tracing: Mark expected switch fall-through

[Gustavo A. R. Silva]

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

This patch fixes the following warning:

kernel/trace/trace_events_filter.c: In function ‘predicate_parse’:
kernel/trace/trace_events_filter.c:494:8: warning: this statement may fall 
through [-Wimplicit-fallthrough=]
     if (next[1] == next[0]) {
        ^
kernel/trace/trace_events_filter.c:498:4: note: here
    default:
    ^~~~~~~

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

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

Signed-off-by: Gustavo A. R. Silva <gust...@embeddedor.com>
---
 kernel/trace/trace_events_filter.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/trace/trace_events_filter.c 
b/kernel/trace/trace_events_filter.c
index 27821480105e..eb694756c4bb 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -495,6 +495,7 @@ predicate_parse(const char *str, int nr_parens, int 
nr_preds,
                                        ptr++;
                                        break;
                                }
+                               /* fall through */
                        default:
                                parse_error(pe, FILT_ERR_TOO_MANY_PREDS,
                                            next - str);
-- 
2.20.1