linux-kernel - [PATCH v2 3/3] arm64: io: Hook up __io

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Message-Id: <20190222180454.5992-4-will.deacon@arm.com>
Date:   Fri, 22 Feb 2019 18:04:54 +0000
From:   Will Deacon <will.deacon@....com>
To:     linux-arch@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, andrew.murray@....com, arnd@...db.de,
        catalin.marinas@....com, geert@...ux-m68k.org, palmer@...ive.com,
        Will Deacon <will.deacon@....com>
Subject: [PATCH v2 3/3] arm64: io: Hook up __io_par() for inX() ordering

Ensure that inX() provides the same ordering guarantees as readX()
by hooking up __io_par() so that it maps directly to __iormb().

Reported-by: Andrew Murray <andrew.murray@....com>
Signed-off-by: Will Deacon <will.deacon@....com>
---
 arch/arm64/include/asm/io.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
index ee723835c1f4..8bb7210ac286 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h
@@ -121,6 +121,7 @@ static inline u64 __raw_readq(const volatile void __iomem *addr)
 		     : "memory");					\
 })
 
+#define __io_par(v)		__iormb(v)
 #define __iowmb()		wmb()
 
 #define mmiowb()		do { } while (0)
-- 
2.11.0