linux-kernel - Re: [PATCH] MTD: m25p80: add debugging trace in sst

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Date:	Wed, 15 Dec 2010 16:12:13 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Sergei Shtylyov <sshtylyov@...sta.com>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	linux-mtd@...ts.infradead.org, dwmw2@...radead.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] MTD: m25p80: add debugging trace in sst_write()

On Wed, Dec 15, 2010 at 04:25:28PM +0300, Sergei Shtylyov wrote:
>> +	DEBUG(MTD_DEBUG_LEVEL2, "%s: %s %s 0x%08x, len %zd\n",
>> +			dev_name(&flash->spi->dev), __func__, "to",
>
>    What's the point of printing "to" as variable? :-)

One valid reason to do this is if you have several formatting strings
all the same.  GCC can merge identical strings together.

So, if you have:

 "%s: %s %s 0x%08x, len %zd", dev_name(), __func__, "to"
 "%s: %s %s 0x%08x, len %zd", dev_name(), __func__, "from"
 "%s: %s %s 0x%08x, len %zd", dev_name(), __func__, "foo"

Then you end up with one long string and three short strings instead of

 "%s: %s to 0x%08x, len %zd", dev_name(), __func__
 "%s: %s from 0x%08x, len %zd", dev_name(), __func__
 "%s: %s foo 0x%08x, len %zd", dev_name(), __func__

which'd be three long strings.
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