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Re: [PATCH] MIPS: Define __arch_swab64 for all mips r2 cpus.

To: David Daney <>
Subject: Re: [PATCH] MIPS: Define __arch_swab64 for all mips r2 cpus.
From: David Daney <>
Date: Wed, 17 Dec 2008 13:20:59 -0800
In-reply-to: <>
Original-recipient: rfc822;
References: <>
User-agent: Thunderbird (X11/20081119)
David Daney wrote:
Some CPUs implement mipsr2, but because they are a super-set of
mips64r2 do not define CONFIG_CPU_MIPS64_R2.  Cavium OCTEON falls into
this category.  We would still like to use the optimized
implementation, so since we have already checked for
CONFIG_CPU_MIPSR2, checking for CONFIG_64BIT instead of
CONFIG_CPU_MIPS64_R2 is sufficient.

Signed-off-by: David Daney <>
 arch/mips/include/asm/byteorder.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/mips/include/asm/byteorder.h 
index 2988d29..92ec1e1 100644
--- a/arch/mips/include/asm/byteorder.h
+++ b/arch/mips/include/asm/byteorder.h
@@ -46,7 +46,7 @@ static inline __attribute_const__ __u32 __arch_swab32(__u32 x)
 #define __arch_swab32 __arch_swab32
-#ifdef CONFIG_CPU_MIPS64_R2
+#ifdef CONFIG_64BIT
 static inline __attribute_const__ __u64 __arch_swab64(__u64 x)

Although this patch is correct, it is not sufficient.  The
implementation of __arch_swab64 is incorrect and unusable.

My next patch, which fixes it, should probably be applied before this

David Daney

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