Re: [PATCH, RFC 2/8] ARM: twd: register clock event for 1 core SMP

From: Santosh Shilimkar
Date: Tue Feb 19 2013 - 05:13:13 EST

On Monday 18 February 2013 05:07 PM, Afzal Mohammed wrote:
Register percpu local timer for scheduler tick in the case of one core
SMP configuration. In other cases - secondary cpu's as well as boot
cpu's having more than one core, this is being registered as per
existing boot flow, with a difference that they happens after delay
calibration. Registering the clock for tick in case of one core should
be done before Kernel calibrates delay (this is required to boot,
unless local timer is the only one registered for tick). Registering
twd local timer at init_time (which platforms are doing now) helps
achieve that with the proposed change.

This helps in an almost booting Kernel (minimal) by only relying on
ARM parts for an A9 one core SMP.

Signed-off-by: Afzal Mohammed <afzal@xxxxxx>
As mentioned in cover-letter, I don't think we have good
reasoning to make TWD to work with UP configuration. Even
you fix the timer code, there are more cascaded dependencies
which is not worth the effort.


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