blob: de7f791579183f259d618f609fc249e34bb7fdff (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
|
#ifndef _ASM_POWERPC_MEMBARRIER_H
#define _ASM_POWERPC_MEMBARRIER_H
static inline void membarrier_arch_switch_mm(struct mm_struct *prev,
struct mm_struct *next,
struct task_struct *tsk)
{
/*
* Only need the full barrier when switching between processes.
* Barrier when switching from kernel to userspace is not
* required here, given that it is implied by mmdrop(). Barrier
* when switching from userspace to kernel is not needed after
* store to rq->curr.
*/
if (IS_ENABLED(CONFIG_SMP) &&
likely(!(atomic_read(&next->membarrier_state) &
(MEMBARRIER_STATE_PRIVATE_EXPEDITED |
MEMBARRIER_STATE_GLOBAL_EXPEDITED)) || !prev))
return;
/*
* The membarrier system call requires a full memory barrier
* after storing to rq->curr, before going back to user-space.
*/
smp_mb();
}
#endif /* _ASM_POWERPC_MEMBARRIER_H */
|
