linux-kernel - Re: [PATCH 11/11] dynamic_debug: use a single printk() to emit msgs

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Date:	Thu, 14 Jul 2011 23:41:53 -0700
From:	Joe Perches <joe@...ches.com>
To:	Jason Baron <jbaron@...hat.com>
Cc:	gregkh@...e.de, jim.cromie@...il.com, bvanassche@....org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/11] dynamic_debug: use a single printk() to emit msgs

On Thu, 2011-07-14 at 12:09 -0400, Jason Baron wrote:
> We were using KERN_CONT to combine msgs with their prefix.
[]
> diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c

Perhaps instead:

> +static int dynamic_emit_prefix(const struct _ddebug *descriptor, char *buf)

static char *dynamic_emit_prefix(...)
[]

	snprintf(buf, PREFIX_SIZE, KERN_DEBUG"%s%s%s%s%s%s",

Add a space please after KERN_DEBUG

[]
	return buf;

>  int __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...)
[]
> +	res = dynamic_emit_prefix(descriptor, buf);
> +	res += printk("%s %pV", buf, &vaf);

This double counts the length of dynamic_emit_prefix.
I think this and the others should be:

	res = printk("%s %pV", dynamic_emit_prefix(descriptor, buf), &vaf);
 

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