linux-kernel - Re: [PATCH 20/29] tools lib traceevent: Remove malloc_or_die from plugin

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Date:	Fri, 29 Nov 2013 15:41:10 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Steven Rostedt <rostedt@...dmis.org>,
	David Ahern <dsahern@...il.com>
Subject: Re: [PATCH 20/29] tools lib traceevent: Remove malloc_or_die from plugin_function.c

Hi Jiri,

On Thu, 28 Nov 2013 12:33:19 +0100, Jiri Olsa wrote:
> Removing malloc_or_die calls from plugin_function.c,
> replacing them with standard malloc and error path.
>
> Suggested-by: Namhyung Kim <namhyung@...nel.org>
> Signed-off-by: Jiri Olsa <jolsa@...hat.com>
> Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: David Ahern <dsahern@...il.com>
> ---
>  tools/lib/traceevent/plugin_function.c | 15 +++++++++++++--
>  1 file changed, 13 insertions(+), 2 deletions(-)
>
> diff --git a/tools/lib/traceevent/plugin_function.c b/tools/lib/traceevent/plugin_function.c
> index 87acf9c..328d17d 100644
> --- a/tools/lib/traceevent/plugin_function.c
> +++ b/tools/lib/traceevent/plugin_function.c
> @@ -44,10 +44,16 @@ static void add_child(struct func_stack *stack, const char *child, int pos)
>  		free(stack->stack[pos]);
>  	else {
>  		if (!stack->stack)
> -			stack->stack = malloc_or_die(sizeof(char *) * STK_BLK);
> +			stack->stack = malloc(sizeof(char *) * STK_BLK);
>  		else
>  			stack->stack = realloc(stack->stack, sizeof(char *) *
>  					       (stack->size + STK_BLK));

I think single realloc() can handle both cases.  And this code has a
problem that it overwrites stack->stack to NULL in case of error so that
we cannot point original region anymore.  You'd better to use a temp
variable IMHO.

> +
> +		if (!stack->stack) {
> +			warning("could not allocate plugin memory\n");
> +			return;
> +		}
> +
>  		for (i = stack->size; i < stack->size + STK_BLK; i++)
>  			stack->stack[i] = NULL;
>  		stack->size += STK_BLK;
> @@ -67,7 +73,12 @@ static int add_and_get_index(const char *parent, const char *child, int cpu)
>  		if (fstack)
>  			fstack = realloc(fstack, sizeof(*fstack) * (cpu + 1));
>  		else
> -			fstack = malloc_or_die(sizeof(*fstack) * (cpu + 1));
> +			fstack = malloc(sizeof(*fstack) * (cpu + 1));

Ditto.

Thanks,
Namhyung

> +
> +		if (!fstack) {
> +			warning("could not allocate plugin memory\n");
> +			return 0;
> +		}
>  
>  		/* Account for holes in the cpu count */
>  		for (i = cpus + 1; i <= cpu; i++)
--
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