linux-kernel - Re: [PATCH 4/9] cpuidle: Introduce .abbr (abbrevation) for cpuidle states

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Date:	Thu, 13 Jan 2011 10:42:29 -0500
From:	Valdis.Kletnieks@...edu
To:	Len Brown <lenb@...nel.org>
Cc:	Thomas Renninger <trenn@...e.de>, linux-perf-users@...r.kernel.org,
	mingo@...e.hu, arjan@...ux.intel.com, j-pihet@...com,
	linux-acpi@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCH 4/9] cpuidle: Introduce .abbr (abbrevation) for cpuidle states

On Wed, 12 Jan 2011 17:25:12 EST, Len Brown said:

> > But by sysfs convention a separate file must be used
> > if two data are passed to userspace which is the case here.
> 
> what two data?
> 
> It is fine for a string to include space characters.

I think Thomas is concerned that although when you actually read a /sys
file, you know it's one string, that fact can get easily lost and cause issues
down the road. Consider this code:

foo=`cat /sys/some/file`
bar=`cat /sys/other/file`
baz=`cat /sys/third/file`
echo $foo $bar $baz | awk '{print $2 $3}'

Suddenly your output isn't what you expected...

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