[PATCH v3] ARM: sched_clock: allow sched_clock to be selected at runtime

Marc Zyngier marc.zyngier at arm.com
Fri Sep 2 08:56:03 EDT 2011

Hi Tony,

On 02/09/11 13:49, Tony Lindgren wrote:
> * Marc Zyngier <marc.zyngier at arm.com> [110830 16:29]:
>> sched_clock() is yet another blocker on the road to the single
>> image. This patch implements an idea by Russell King:
>> http://www.spinics.net/lists/linux-omap/msg49561.html
>> Instead of asking the platform to implement both sched_clock()
>> itself and the rollover callback, simply register a read()
>> function, and let the ARM code care about sched_clock() itself,
>> the conversion to ns and the rollover. sched_clock() uses
>> this read() function as an indirection to the platform code.
>> This allow some simplifications and possibly some footprint gain
>> when multiple platforms are compiled in. Among the drawbacks,
>> the removal of the *_fixed_sched_clock optimization which could
>> negatively impact some platforms (sa1100, tegra, versatile
>> and omap).
>> Tested on 11MPCore, OMAP4 and Tegra.
> Great, seems to boot just fine with printk_time :)
> I gave it a quick boot test on omap16xx, 2420, 3430,
> 3630 and 4430:
> Tested-by: Tony Lindgren <tony at atomide.com>

Thanks for testing!.

Jazz is not dead. It just smells funny...

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