Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) #ifndef _ASM_POWERPC_MEMBARRIER_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) #define _ASM_POWERPC_MEMBARRIER_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) static inline void membarrier_arch_switch_mm(struct mm_struct *prev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 					     struct mm_struct *next,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 					     struct task_struct *tsk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 	 * Only need the full barrier when switching between processes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 	 * Barrier when switching from kernel to userspace is not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 	 * required here, given that it is implied by mmdrop(). Barrier
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 	 * when switching from userspace to kernel is not needed after
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 	 * store to rq->curr.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 	if (likely(!(atomic_read(&next->membarrier_state) &
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 		     (MEMBARRIER_STATE_PRIVATE_EXPEDITED |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 		      MEMBARRIER_STATE_GLOBAL_EXPEDITED)) || !prev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	 * The membarrier system call requires a full memory barrier
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	 * after storing to rq->curr, before going back to user-space.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	smp_mb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #endif /* _ASM_POWERPC_MEMBARRIER_H */