In SMP, every CPU has its own loops_per_jiffy value, __loop_const_udelay time period is not right if two cpus are running in different frequency.

in __loop_const_udelay function, the delayed time period is calculated according to loops_per_jiffy. In SMP, every CPU has its own loops_per_jiffy value, __loop_const_udelay time period is not right if two cpus are running in different frequency. the following is file arch/arm/lib/delay-loop.S

In SMP, every CPU has its own loops_per_jiffy value, __loop_const_udelay time period is not right if two cpus are running in different frequency.

in __loop_const_udelay function, the delayed time period is calculated according to loops_per_jiffy. In SMP, every CPU has its own loops_per_jiffy value, __loop_const_udelay time period is not right if two cpus are running in different frequency. the following is file arch/arm/lib/delay-loop.S