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From: Will Deacon <will.deacon@arm.com>
To: linux-arch@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, andrew.murray@arm.com,
	arnd@arndb.de, catalin.marinas@arm.com,
	Will Deacon <will.deacon@arm.com>
Subject: [PATCH 2/2] arm64: io: Hook up __io_par() for inX() ordering
Date: Mon, 11 Feb 2019 17:45:44 +0000	[thread overview]
Message-ID: <20190211174544.4302-3-will.deacon@arm.com> (raw)
In-Reply-To: <20190211174544.4302-1-will.deacon@arm.com>

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@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.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..2985febe63ec 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		__iormb
 #define __iowmb()		wmb()
 
 #define mmiowb()		do { } while (0)
-- 
2.11.0


  parent reply	other threads:[~2019-02-11 17:45 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-11 17:45 [PATCH 0/2] Ensure inX() is ordered wrt delay() routines Will Deacon
2019-02-11 17:45 ` [PATCH 1/2] asm-generic/io: Pass result on inX() accessor to __io_par() Will Deacon
2019-02-12 11:55   ` Arnd Bergmann
2019-02-12 11:55     ` Arnd Bergmann
2019-02-13 17:46     ` Will Deacon
2019-02-13 17:46       ` Will Deacon
2019-02-13 20:59       ` Arnd Bergmann
2019-02-13 20:59         ` Arnd Bergmann
2019-02-13 21:57         ` Palmer Dabbelt
2019-02-13 21:57           ` Palmer Dabbelt
2019-02-18 15:56           ` Will Deacon
2019-02-18 15:56             ` Will Deacon
2019-02-11 17:45 ` Will Deacon [this message]
2019-02-12 10:42   ` [PATCH 2/2] arm64: io: Hook up __io_par() for inX() ordering Geert Uytterhoeven
2019-02-13 17:25     ` Will Deacon

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