linux-kernel - Re: [PATCH v2 3/3] thermal: Make THERMAL

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Date:	Tue, 26 Apr 2011 08:52:12 -0700
From:	Guenter Roeck <guenter.roeck@...csson.com>
To:	Jean Delvare <khali@...ux-fr.org>
CC:	Len Brown <len.brown@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Rene Herman <rene.herman@...il.com>
Subject: Re: [PATCH v2 3/3] thermal: Make THERMAL_HWMON implementation
 fully internal

On Tue, Apr 26, 2011 at 11:04:07AM -0400, Jean Delvare wrote:
> THERMAL_HWMON is implemented inside the thermal_sys driver and has no
> effect on drivers implementing thermal zones, so they shouldn't see
> anything related to it in <linux/thermal.h>. Making the THERMAL_HWMON
> implementation fully internal has two advantages beyond the cleaner
> design:
> * This avoids rebuilding all thermal drivers if the THERMAL_HWMON
>   implementation changes, or if CONFIG_THERMAL_HWMON gets enabled or
>   disabled.
> * This avoids breaking the thermal kABI in these cases too, which
>   should make distributions happy.
> 
> The only drawback I can see is slightly higher memory fragmentation,
> as the number of kzalloc() calls will increase by one per thermal zone.
> But I doubt it will be a problem in practice, as I've never seen a
> system with more than two thermal zones.
> 
> Signed-off-by: Jean Delvare <khali@...ux-fr.org>
> Cc: Rene Herman <rene.herman@...il.com>
> Cc: Len Brown <len.brown@...el.com>
> Cc: Guenter Roeck <guenter.roeck@...csson.com>
> ---
> * If memory fragmentation is really a concern to anyone, it would be
>   possible to save one kalloc for the first temperature input of each
>   zone type, as the price of slightly more complex code.
> 
> * Removal code path is untested, as I have never been able to unload
> the thermal_sys module on any of my systems. Something is pinning it
> and I have no idea what it is.
> 
Doesn't lsmod show the culprit ?

Otherwise

Acked-by: Guenter Roeck <guenter.roeck@...csson.com>
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