linux-kernel - Re: [PATCH 0/9] tools lib traceevent: Pulling in updates from trace-cmd

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Message-ID: <20150324152535.GF5447@kernel.org>
Date:	Tue, 24 Mar 2015 12:25:35 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Guilherme Cox <cox@...puter.org>
Subject: Re: [PATCH 0/9] tools lib traceevent: Pulling in updates from
 trace-cmd

Em Tue, Mar 24, 2015 at 11:04:28AM -0400, Steven Rostedt escreveu:
> On Tue, 24 Mar 2015 11:57:27 -0300
> Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
> 
> > Em Tue, Mar 24, 2015 at 09:57:48AM -0400, Steven Rostedt escreveu:
> > > Arnaldo,
> > > 
> > > I took a look at the differences between what I have in trace-cmd and
> > > what is sitting in tools/lib/traceevent, and I put together a patch set
> > > that brings in fixes and updates to libtraceevent.
> > 
> > Thanks, will process now.
> 
> I just added this one too...

ok, adding this one as well.
 
> -- Steve
> 
> From fe80b2e9396fa6b8dc66a6dfd4c7a426e1685424 Mon Sep 17 00:00:00 2001
> From: Guilherme Cox <cox@...puter.org>
> Date: Fri, 20 Feb 2015 19:10:34 -0500
> Subject: [PATCH] tools lib traceevent: Zero should not be considered "not
>  found" in eval_flag()
> 
> Guilherme Cox found that:
>  There is, however, a potential bug if there is an item with code zero
>  that is not the first one in the symbol list, since eval_flag(..)
>  returns 0 when it doesn't find anything.
> 
> Reported-by: Guilherme Cox <cox@...puter.org>
> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> ---
>  tools/lib/traceevent/event-parse.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
> index aff743710001..f2fb50141703 100644
> --- a/tools/lib/traceevent/event-parse.c
> +++ b/tools/lib/traceevent/event-parse.c
> @@ -3576,7 +3576,7 @@ static const struct flag flags[] = {
>  	{ "HRTIMER_RESTART", 1 },
>  };
>  
> -static unsigned long long eval_flag(const char *flag)
> +static long long eval_flag(const char *flag)
>  {
>  	int i;
>  
> @@ -3592,7 +3592,7 @@ static unsigned long long eval_flag(const char *flag)
>  		if (strcmp(flags[i].name, flag) == 0)
>  			return flags[i].value;
>  
> -	return 0;
> +	return -1LL;
>  }
>  
>  static void print_str_to_seq(struct trace_seq *s, const char *format,
> @@ -3666,7 +3666,7 @@ static void print_str_arg(struct trace_seq *s, void *data, int size,
>  	struct print_flag_sym *flag;
>  	struct format_field *field;
>  	struct printk_map *printk;
> -	unsigned long long val, fval;
> +	long long val, fval;
>  	unsigned long addr;
>  	char *str;
>  	unsigned char *hex;
> @@ -3725,11 +3725,11 @@ static void print_str_arg(struct trace_seq *s, void *data, int size,
>  		print = 0;
>  		for (flag = arg->flags.flags; flag; flag = flag->next) {
>  			fval = eval_flag(flag->value);
> -			if (!val && !fval) {
> +			if (!val && fval < 0) {
>  				print_str_to_seq(s, format, len_arg, flag->str);
>  				break;
>  			}
> -			if (fval && (val & fval) == fval) {
> +			if (fval > 0 && (val & fval) == fval) {
>  				if (print && arg->flags.delim)
>  					trace_seq_puts(s, arg->flags.delim);
>  				print_str_to_seq(s, format, len_arg, flag->str);
> -- 
> 1.8.3.1
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