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List:       linux-backports
Subject:    [PATCH 2/4] backports: Add smp_acquire__after_ctrl_dep()
From:       Hauke Mehrtens <hauke () hauke-m ! de>
Date:       2019-03-26 15:11:36
Message-ID: 20190326151138.4141-2-hauke () hauke-m ! de
[Download RAW message or body]

smp_acquire__after_ctrl_dep() was introduced in kernel 4.8 in upstream
Linux commit 33ac279677d ("locking/barriers: Introduce
smp_acquire__after_ctrl_dep()") and is used by backports lib-refcount.c
implementation now.

This just adds the default implementation to backports.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
 backport/backport-include/asm/barrier.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/backport/backport-include/asm/barrier.h b/backport/backport-include/asm/barrier.h
index 9e1e1f11..bca05588 100644
--- a/backport/backport-include/asm/barrier.h
+++ b/backport/backport-include/asm/barrier.h
@@ -19,4 +19,8 @@
 #define smp_mb__after_atomic smp_mb__after_clear_bit
 #endif
 
+#ifndef smp_acquire__after_ctrl_dep
+#define smp_acquire__after_ctrl_dep()		smp_rmb()
+#endif
+
 #endif /* __BACKPORT_ASM_BARRIER_H */
-- 
2.20.1

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