Vineet Gupta 5b9027d6d0 ARCv2: perf: optimize given that num counters <= 32 ...

use ffz primitive which maps to ARCv2 instruction, vs. non atomic
__test_and_set_bit

It is unlikely if we will even have more than 32 counters, but still add
a BUILD_BUG to catch that

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

2017-11-21 15:20:55 -08:00

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