linux-kernel - Re: [PATCH 5/5] blktrace: print human-readable act

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Date:	Tue, 24 Mar 2009 16:56:09 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Li Zefan <lizf@...fujitsu.com>, Jens Axboe <jens.axboe@...cle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/5] blktrace: print human-readable act_mask


* Steven Rostedt <rostedt@...dmis.org> wrote:

> 
> 
> On Tue, 24 Mar 2009, Li Zefan wrote:
> >  
> > +static ssize_t blk_trace_mask2str(char *buf, int mask)
> > +{
> > +	int i;
> > +	char *p = buf;
> > +
> > +	for (i = 0; i < ARRAY_SIZE(mask_maps); i++) {
> > +		if (mask & mask_maps[i].mask) {
> > +			p += sprintf(p, "%s%s",
> > +				    (p == buf) ? "" : ",", mask_maps[i].str);
> > +		}
> > +	}
> > +	*p++ = '\n';
> > +
> > +	return (p - buf);
> > +}
> > +
> >  static struct request_queue *blk_trace_get_queue(struct block_device *bdev)
> >  {
> >  	if (bdev->bd_disk == NULL)
> > @@ -1399,7 +1423,7 @@ static ssize_t sysfs_blk_trace_attr_show(struct device *dev,
> >  	if (q->blk_trace == NULL)
> >  		ret = sprintf(buf, "disabled\n");
> >  	else if (attr == &dev_attr_act_mask)
> > -		ret = sprintf(buf, "%#x\n", q->blk_trace->act_mask);
> > +		ret = blk_trace_mask2str(buf, q->blk_trace->act_mask);
> >  	else if (attr == &dev_attr_pid)
> >  		ret = sprintf(buf, "%u\n", q->blk_trace->pid);
> >  	else if (attr == &dev_attr_start_lba)
> > @@ -1432,9 +1456,11 @@ static ssize_t sysfs_blk_trace_attr_store(struct device *dev,
> >  	if (attr == &dev_attr_act_mask) {
> >  		if (sscanf(buf, "%llx", &value) != 1) {
> >  			/* Assume it is a list of trace category names */
> > -			value = blk_str2act_mask(buf);
> > -			if (value < 0)
> > +			value = blk_trace_str2mask(buf);
> 
> Hmm, does this compile? Doesn't blk_trace_str2mask need two parameters?

No, it needs one parameter.

	Ingo
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