[PATCH 3/8] membarrier: Remove membarrier_arch_switch_mm() prototype in core code

[Andy Lutomirski <luto@kernel.org>]

membarrier_arch_switch_mm()'s sole implementation and caller are in
arch/powerpc.  Having a fallback implementation in include/linux is
confusing -- remove it.

It's still mentioned in a comment, but a subsequent patch will remove
it.

Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
---
 include/linux/sched/mm.h | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h
index 24d97d1b6252..10aace21d25e 100644
--- a/include/linux/sched/mm.h
+++ b/include/linux/sched/mm.h
@@ -350,13 +350,6 @@ extern void membarrier_exec_mmap(struct mm_struct *mm);
 extern void membarrier_update_current_mm(struct mm_struct *next_mm);
 
 #else
-#ifdef CONFIG_ARCH_HAS_MEMBARRIER_CALLBACKS
-static inline void membarrier_arch_switch_mm(struct mm_struct *prev,
-					     struct mm_struct *next,
-					     struct task_struct *tsk)
-{
-}
-#endif
 static inline void membarrier_exec_mmap(struct mm_struct *mm)
 {
 }
-- 
2.31.1