Thread (155 messages) 155 messages, 13 authors, 2016-04-14
STALE3695d REVIEWED: 5 (5M)
Revisions (6)
  1. v2 [diff vs current]
  2. v2 [diff vs current]
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  5. v3 current
  6. v3 [diff vs current]

[PATCH v3 09/41] arm64: reuse asm-generic/barrier.h

From: "Michael S. Tsirkin" <mst@redhat.com>
Date: 2016-01-10 14:17:59
Also in: linux-arch, linux-arm-kernel, linux-mips, linux-s390, linux-sh, linux-um, lkml, sparclinux
Subsystem: arm64 port (aarch64 architecture), the rest · Maintainers: Catalin Marinas, Will Deacon, Linus Torvalds

On arm64 nop, read_barrier_depends, smp_read_barrier_depends
smp_store_mb(), smp_mb__before_atomic and smp_mb__after_atomic match the
asm-generic variants exactly. Drop the local definitions and pull in
asm-generic/barrier.h instead.

This is in preparation to refactoring this code area.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/arm64/include/asm/barrier.h | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)
diff --git a/arch/arm64/include/asm/barrier.h b/arch/arm64/include/asm/barrier.h
index 9622eb4..91a43f4 100644
--- a/arch/arm64/include/asm/barrier.h
+++ b/arch/arm64/include/asm/barrier.h
@@ -91,14 +91,7 @@ do {									\
 	__u.__val;							\
 })
 
-#define read_barrier_depends()		do { } while(0)
-#define smp_read_barrier_depends()	do { } while(0)
-
-#define smp_store_mb(var, value)	do { WRITE_ONCE(var, value); smp_mb(); } while (0)
-#define nop()		asm volatile("nop");
-
-#define smp_mb__before_atomic()	smp_mb()
-#define smp_mb__after_atomic()	smp_mb()
+#include <asm-generic/barrier.h>
 
 #endif	/* __ASSEMBLY__ */
 
-- 
MST
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