[PATCH] tracing: Mark expected switch fall-through

[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 <gustavo@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

Re: [PATCH] tracing: Mark expected switch fall-through

[Steven Rostedt]

On Tue, 12 Feb 2019 15:08:03 -0600
"Gustavo A. R. Silva" <gustavo@embeddedor.com> wrote:

> 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
> 

Thanks, but I've already applied this patch:

 http://lkml.kernel.org/r/20190114203039.16535-2-malat@debian.org

I just haven't run my queue through my tests to push it to linux-next
yet.

-- Steve

> This patch is part of the ongoing efforts to enable
> -Wimplicit-fallthrough.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@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);