From: Peter Zijlstra [mailto:peterz at infradead.org] Sent: Monday, November 02, 2015 11:22 AM > At which point you might want to revisit: > arch/arc/include/asm/processor.h:#define cpu_relax_lowlatency() cpu_relax() Thanks, I will define this as barrier since cpu_relax() may take out current logical CPU for many cycles.