[PATCH] powerpc: mitigate impact of decrementer reset

Paul Clarke pc at us.ibm.com
Wed Oct 8 23:27:15 EST 2014

On 10/08/2014 12:37 AM, Heinz Wrobel wrote:
> what if your tb wraps during the  test?

Per the Power ISA, Time Base is 64 bits, monotonically increasing, and 
is writable only in hypervisor state.  To my understanding, it is set to 
zero at boot (although this is not prescribed).

Also, as noted by others, the logic is roughly duplicated (with some 
differences) from the analogous code in __timer_interrupt just above it.

I don't see wrapping as a concern.


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