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SubjectRe: udelay function delays the wrong time interval in multiprocessor system, if ARCH_HAS_READ_CURRENT_TIMER is not defined and on current timer is used.
On Sat, Mar 16, 2013 at 12:08:54AM +0800, chpoph wrote:
> If ARCH_HAS_READ_CURRENT_TIMER is not defined and on current timer is
> used for udelay, then __loop_delay and __loop_const_udelay is used to
> delay a specific time interval. but in delay-loop.S, loops_per_jiffy
> (not per cpu data) is used to calculate the number of loops. in SMP
> system, udelay delays the wrong time interval if two cpus running at
> different frequency.

We don't support different CPUs running at different frequencies with
the delay loop. Sorry.


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