linux-kernel - [PATCH 08/18] ia64: io: implement dummy relaxed accessor macros for writes

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Message-Id: <1397742261-15621-9-git-send-email-will.deacon@arm.com>
Date:	Thu, 17 Apr 2014 14:44:11 +0100
From:	Will Deacon <will.deacon@....com>
To:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	arnd@...db.de, monstr@...str.eu, dhowells@...hat.com,
	broonie@...aro.org, benh@...nel.crashing.org, peterz@...radead.org,
	paulmck@...ux.vnet.ibm.com, Will Deacon <will.deacon@....com>,
	Tony Luck <tony.luck@...el.com>
Subject: [PATCH 08/18] ia64: io: implement dummy relaxed accessor macros for writes

write{b,w,l,q}_relaxed are implemented by some architectures in order to
permit memory-mapped I/O accesses with weaker barrier semantics than the
non-relaxed variants.

This patch adds dummy macros for the write accessors to ia64, which may
be able to be optimised in a similar manner to the relaxed read
accessors at a later date.

Cc: Tony Luck <tony.luck@...el.com>
Signed-off-by: Will Deacon <will.deacon@....com>
---
 arch/ia64/include/asm/io.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/ia64/include/asm/io.h b/arch/ia64/include/asm/io.h
index 0d2bcb37ec35..379165154c27 100644
--- a/arch/ia64/include/asm/io.h
+++ b/arch/ia64/include/asm/io.h
@@ -393,6 +393,10 @@ __writeq (unsigned long val, volatile void __iomem *addr)
 #define writew(v,a)	__writew((v), (a))
 #define writel(v,a)	__writel((v), (a))
 #define writeq(v,a)	__writeq((v), (a))
+#define writeb_relaxed(v,a)	__writeb((v), (a))
+#define writew_relaxed(v,a)	__writew((v), (a))
+#define writel_relaxed(v,a)	__writel((v), (a))
+#define writeq_relaxed(v,a)	__writeq((v), (a))
 #define __raw_writeb	writeb
 #define __raw_writew	writew
 #define __raw_writel	writel
-- 
1.9.1

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