atomic_sub_if_positive  237 arch/mips/include/asm/atomic.h #define atomic_dec_if_positive(v)	atomic_sub_if_positive(1, v)
atomic_sub_if_positive  333 arch/riscv/include/asm/atomic.h #define atomic_dec_if_positive(v)	atomic_sub_if_positive(v, 1)