linux-kernel - [PATCH 3/8] membarrier: Remove membarrier_arch_switch

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Date:   Tue, 15 Jun 2021 20:21:08 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     x86@...nel.org
Cc:     Dave Hansen <dave.hansen@...el.com>,
        LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH 3/8] membarrier: Remove membarrier_arch_switch_mm() prototype in core code

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@...icios.com>
Cc: Nicholas Piggin <npiggin@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Andy Lutomirski <luto@...nel.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