linux-kernel - Re: [PATCH v3 5/8] stacktrace: introduce snprint_stack

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Message-Id: <20141124145752.ab64fd85.akpm@linux-foundation.org>
Date:	Mon, 24 Nov 2014 14:57:52 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
Cc:	Mel Gorman <mgorman@...e.de>, Johannes Weiner <hannes@...xchg.org>,
	Minchan Kim <minchan@...nel.org>, Dave Hansen <dave@...1.net>,
	Michal Nazarewicz <mina86@...a86.com>,
	Jungsoo Son <jungsoo.son@....com>,
	Ingo Molnar <mingo@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 5/8] stacktrace: introduce snprint_stack_trace for
 buffer output

On Mon, 24 Nov 2014 17:15:23 +0900 Joonsoo Kim <iamjoonsoo.kim@....com> wrote:

> Current stacktrace only have the function for console output.
> page_owner that will be introduced in following patch needs to print
> the output of stacktrace into the buffer for our own output format
> so so new function, snprint_stack_trace(), is needed.
> 
> ...
>
> +int snprint_stack_trace(char *buf, size_t size,
> +			struct stack_trace *trace, int spaces)
> +{
> +	int i;
> +	unsigned long ip;
> +	int generated;
> +	int total = 0;
> +
> +	if (WARN_ON(!trace->entries))
> +		return 0;
> +
> +	for (i = 0; i < trace->nr_entries; i++) {
> +		ip = trace->entries[i];
> +		generated = snprintf(buf, size, "%*c[<%p>] %pS\n",
> +				1 + spaces, ' ', (void *) ip, (void *) ip);
> +
> +		total += generated;
> +
> +		/* Assume that generated isn't a negative number */
> +		if (generated >= size) {
> +			buf += size;
> +			size = 0;

Seems strange to keep looping around doing nothing.  Would it be better
to `break' here?

> +		} else {
> +			buf += generated;
> +			size -= generated;
> +		}
> +	}
> +
> +	return total;
> +}
> +EXPORT_SYMBOL_GPL(snprint_stack_trace);
> +
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