Re: [PATCH RFC v2 14/16] ARM: vexpress: remove custom .init_timehook

[Russell King - ARM Linux]

On Fri, Aug 30, 2013 at 11:02:31AM +0100, Jon Medhurst (Tixy) wrote:
> After adding of_clk_init(NULL) to time_init() things boot OK for me with
> this patch. However, do we know that sched_clock is never going to get
> read before time_init() has actually started the clock it reads? Are we
> making things more fragile?

As I've been saying for years, sched_clock gets read for the first time
in sched_init() -> init_idle() which occurs before time_init().

Whether that matters or not is debatable, but the first read should return
zero, and it will return zero after initialization - so I think all we end
up losing is some accounting of the time taken in the early kernel boot.

If we wish to talk about correctness, then arguably it isn't correct.
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