lkml.org 
[lkml]   [2012]   [Dec]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 2/2] cpuidle: fix sysfs output for power_usage
On Mon, Dec 17, 2012 at 08:56:45AM +0100, Rafael J. Wysocki wrote:
> On Monday, December 17, 2012 09:38:15 AM Sivaram Nair wrote:
> > On Sat, Dec 15, 2012 at 01:03:02AM +0100, Rafael J. Wysocki wrote:
> > > On Friday, December 14, 2012 03:17:37 PM Sivaram Nair wrote:
> > > > cpuidle_state->power_usage is signed; so change the corresponding sysfs
> > > > ops to output signed value instead of unsigned.
> > >
> > > What's actually wrong with printing it as an unsigned int?
> >
> > power_usage could have negative values (for example cpuidle/driver.c
> > inits this value to -1, -2 etc. when drv->power_specified is not set) and
> > these shows up badly in the sysfs output.
>
> Does "badly" mean "as big positive numbers"?

Yes (sorry for not being clearer).

>
> Should we actually print them at all in those case? Perhaps it'll be better to
> make the file appear empty then?

May be, but why is power_usage signed in the first place? I also noticed
Daniel Lezcano's patches that reduces the scope of this variable. So,
perhaps we can just ignore this change.

-Sivaram


\
 
 \ /
  Last update: 2012-12-17 10:21    [W:0.075 / U:0.276 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site