preempt_count_ptr 20 include/asm-generic/preempt.h *preempt_count_ptr() = pc; preempt_count_ptr 56 include/asm-generic/preempt.h *preempt_count_ptr() += val; preempt_count_ptr 61 include/asm-generic/preempt.h *preempt_count_ptr() -= val; preempt_count_ptr 71 include/asm-generic/preempt.h return !--*preempt_count_ptr() && tif_need_resched();