> I misunderstood, you mean 32bit kernel, not 32bit machine. Theoretically 32bit > kernel can use AVX512, but not sure if anyone use it like this. > get_jiffies_64() > includes jiffies_lock ops so not good in context switch. So I want to use raw > jiffies_64 here. jiffies is a good candidate but it has wraparound overflow > issue. > Other time source are expensive here. > > Should I limit the code only running on 64bit kernel?
Yes making it 64bit only should be fine. Other alternative would be to use 32bit jiffies on 32bit. I assume wrapping is not that big a problem here. -Andi
