Russel,

Would appreciate your thoughts on this.

Colin,

Are you continuing to use the approach used in your patch in your 
development tree? I just want to make sure we have a solution that 
everyone can agree to.

Thanks,
Saravana

Saravana Kannan wrote:

Russell King - ARM Linux wrote:

quoted

My point is not specific to sched_clock, but to counters which on ARM
are 99.9% always memory mapped, and therefore inaccessible during the
very early kernel boot.  sched_clock was merely an illustration of the
problem.

Do you know any code which uses udelay that early? I can't imagine any 
non-driver code using udelay. If it's just drivers using udelay, then 
they need IO mapping to have been completed for the device register 
access to work and hence udelay won't have any problems.

-Saravana