Re: [PATCH][2.6][2/5]Support for HPET based timer

[Andrew Morton <akpm@osdl.org>]

"Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com> wrote:
>
> Problem Description:
>    The requirement from HPET side is, we need to map HPET physical
>  address during timer_init() 
>  routine and also during any read/write HPET addresses. We need to have
>  this mapping kind of
>  permanently, as  we will do HPET reads/writes during every timer
>  interrupt and also during 
>  every gettimeofday (if we don't use tsc timer).
>    And the timer_init() happens before mem_init() (but after paging
>  init()), so we cannot 
>  directly use ioremap(). Current implementation is using a separate
>  fixmap region for HPET.

I doubt if we really need the timer running that early, apart from for
calibrate_delay().

You can probably move the time_init() and calibrate_delay() so they occur
after mem_init().  A close review would be needed to see if that is likely
to break anything.  If it is, then consider creating a new late_time_init()
thing, and call that and calibrate_delay() after mem_init().