> prev and val are both 64 bit variables holding 32 bit numbers, we do
not
> accumulate in either, they are both replaced by values directly from
the
> registers.
> So prev > val will not always be true.
The code seems to be:
prev = local64_read(&event->hw.prev_count);
val = read_pmc(event->hw.idx);
delta = check_and_compute_delta(prev, val);
local64_add(delta, &event->count);
Which looks very much like 'prev' being a 64bit counter generated
from the 32bit pmc register.
David
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