linux-kernel - Re: [PATCH 2/5] tools lib traceevent: Add state member to struct trace

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Date:	Tue, 7 Jan 2014 14:05:58 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/5] tools lib traceevent: Add state member to struct
 trace_seq

On Tue, Jan 07, 2014 at 12:00:09PM +0900, Namhyung Kim wrote:

SNIP

>  void trace_seq_init(struct trace_seq *s);
> diff --git a/tools/lib/traceevent/trace-seq.c b/tools/lib/traceevent/trace-seq.c
> index d7f2e68bc5b9..1747aa50ecb0 100644
> --- a/tools/lib/traceevent/trace-seq.c
> +++ b/tools/lib/traceevent/trace-seq.c
> @@ -32,8 +32,9 @@
>  #define TRACE_SEQ_POISON	((void *)0xdeadbeef)
>  #define TRACE_SEQ_CHECK(s)						\
>  do {									\
> -	if ((s)->buffer == TRACE_SEQ_POISON)			\
> -		die("Usage of trace_seq after it was destroyed");	\
> +	if (WARN_ONCE((s)->buffer == TRACE_SEQ_POISON,			\
> +		      "Usage of trace_seq after it was destroyed"))	\
> +		(s)->state = TRACE_SEQ__BUFFER_POISONED;		\
>  } while (0)
>  
>  /**
> @@ -46,6 +47,7 @@ void trace_seq_init(struct trace_seq *s)
>  	s->readpos = 0;
>  	s->buffer_size = TRACE_SEQ_BUF_SIZE;
>  	s->buffer = malloc_or_die(s->buffer_size);
> +	s->state = TRACE_SEQ__GOOD;
>  }
>  
>  /**
> @@ -81,7 +83,7 @@ static void expand_buffer(struct trace_seq *s)
>  	s->buffer_size += TRACE_SEQ_BUF_SIZE;
>  	s->buffer = realloc(s->buffer, s->buffer_size);
>  	if (!s->buffer)
> -		die("Can't allocate trace_seq buffer memory");
> +		s->state = TRACE_SEQ__MEM_ALLOC_FAILED;

and also here?

	if (WARN_ONCE(!s->buffer))
		s->state = TRACE_SEQ__MEM_ALLOC_FAILED;

otherwise the whole series seems ok,
jirka
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