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SubjectRe: [PATCH RT 11/20] ARM: imx: always use TWD on IMX6Q
On 07/12/2016 11:04 PM, Sebastian Andrzej Siewior wrote:
> * Steven Rostedt | 2016-07-12 10:24:16 [-0400]:
>> 4.1.27-rt31-rc1 stable review patch.
>> If anyone has any objections, please let me know.
> I don't recommend to cherry-pick this. The symbol it selects
> (HAVE_ARM_TWD) has "depends on SMP" in v4.1. In v4.4 there should be
> AM43xx which is UP and also uses the TWD so the change is simple here.

yes. AM43xx is UP and supports ARM TWD, but there could be some 'issues' in !RT case :(

ARM TWD might be powered off in deep CPU Idle states and lose its context if !RT & CPUIDLE,
so there are should be backup broadcast timer configured. And that can cause build issues
related to tick_broadcast()->smp_cross_call().

I've solved it locally for OMAP2 only: commit 0b3e6fca4d1af4aa150d32506220f4241323a00c

^Just FYI. But may be it can be done in more generic way.


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