linux-kernel - Re: [PATCH 3/3] tools lib traceevent: Fix to set uninitialized variables

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Date:   Tue, 18 Oct 2016 14:59:35 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Honggyu Kim <hong.gyu.kim@....com>, namhyung@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] tools lib traceevent: Fix to set uninitialized
 variables

One more.

Em Mon, Oct 17, 2016 at 11:17:12PM +0900, Honggyu Kim escreveu:
> This patch fixes uninitialized variables to remove remaining compiler
> warnings as follows:
> 
>   event-parse.c: In function ‘pevent_find_event_by_name’:
>   event-parse.c:3513:21: warning: ‘event’ may be used uninitialized in this function [-Wmaybe-uninitialized]
>     pevent->last_event = event;
>                        ^
>   event-parse.c: In function ‘pevent_data_lat_fmt’:
>   event-parse.c:5156:20: warning: ‘migrate_disable’ may be used uninitialized in this function [-Wmaybe-uninitialized]
>       trace_seq_printf(s, "%d", migrate_disable);
>                       ^
>   event-parse.c:5163:20: warning: ‘lock_depth’ may be used uninitialized in this function [-Wmaybe-uninitialized]
>       trace_seq_printf(s, "%d", lock_depth);
>                       ^
>   event-parse.c: In function ‘pevent_event_info’:
>   event-parse.c:5060:18: warning: ‘len_arg’ may be used uninitialized in this function [-Wmaybe-uninitialized]
>        print_str_arg(&p, data, size, event,
>                     ^
>   event-parse.c:4846:6: note: ‘len_arg’ was declared here
>     int len_arg;
>         ^
>       ...
>   kbuffer-parse.c: In function ‘__old_next_event’:
>   kbuffer-parse.c:339:27: warning: ‘length’ may be used uninitialized in this function [-Wmaybe-uninitialized]
>     kbuf->next = kbuf->index + length;
>                              ^
>   kbuffer-parse.c:297:15: note: ‘length’ was declared here
>     unsigned int length;
>                  ^
> 
> Signed-off-by: Honggyu Kim <hong.gyu.kim@....com>
> ---
>  tools/lib/traceevent/event-parse.c     | 8 ++++----
>  tools/lib/traceevent/kbuffer-parse.c   | 2 +-
>  tools/lib/traceevent/plugin_function.c | 2 +-
>  3 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
> index 664c90c..2fb9338 100644
> --- a/tools/lib/traceevent/event-parse.c
> +++ b/tools/lib/traceevent/event-parse.c
> @@ -3490,7 +3490,7 @@ struct event_format *
>  pevent_find_event_by_name(struct pevent *pevent,
>  			  const char *sys, const char *name)
>  {
> -	struct event_format *event;
> +	struct event_format *event = NULL;
>  	int i;
>  
>  	if (pevent->last_event &&
> @@ -4843,7 +4843,7 @@ static void pretty_print(struct trace_seq *s, void *data, int size, struct event
>  	char format[32];
>  	int show_func;
>  	int len_as_arg;
> -	int len_arg;
> +	int len_arg = 0;
>  	int len;
>  	int ls;
>  
> @@ -5102,8 +5102,8 @@ void pevent_data_lat_fmt(struct pevent *pevent,
>  	static int migrate_disable_exists;
>  	unsigned int lat_flags;
>  	unsigned int pc;
> -	int lock_depth;
> -	int migrate_disable;
> +	int lock_depth = -1;
> +	int migrate_disable = 0;
>  	int hardirq;
>  	int softirq;
>  	void *data = record->data;
> diff --git a/tools/lib/traceevent/kbuffer-parse.c b/tools/lib/traceevent/kbuffer-parse.c
> index 65984f1..fc8f20c 100644
> --- a/tools/lib/traceevent/kbuffer-parse.c
> +++ b/tools/lib/traceevent/kbuffer-parse.c
> @@ -294,7 +294,7 @@ static unsigned int old_update_pointers(struct kbuffer *kbuf)
>  	unsigned int type;
>  	unsigned int len;
>  	unsigned int delta;
> -	unsigned int length;
> +	unsigned int length = 0;
>  	void *ptr = kbuf->data + kbuf->curr;
>  
>  	type_len_ts = read_4(kbuf, ptr);
> diff --git a/tools/lib/traceevent/plugin_function.c b/tools/lib/traceevent/plugin_function.c
> index a00ec19..42dbf73 100644
> --- a/tools/lib/traceevent/plugin_function.c
> +++ b/tools/lib/traceevent/plugin_function.c
> @@ -130,7 +130,7 @@ static int function_handler(struct trace_seq *s, struct pevent_record *record,
>  	unsigned long long pfunction;
>  	const char *func;
>  	const char *parent;
> -	int index;
> +	int index = 0;
>  
>  	if (pevent_get_field_val(s, event, "ip", record, &function, 1))
>  		return trace_seq_putc(s, '!');
> -- 
> 2.10.0.rc2.dirty