linux-kernel - [PATCH 04/31] Add avr32-specific parity functions

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Message-ID: <56F773D6.9070502@gmail.com>
Date:	Sun, 27 Mar 2016 13:47:02 +0800
From:	"zhaoxiu.zeng" <zhaoxiu.zeng@...il.com>
To:	Haavard Skinnemoen <hskinnemoen@...il.com>,
	Hans-Christian Egtvedt <egtvedt@...fundet.no>,
	Zeng Zhaoxiu <zhaoxiu.zeng@...il.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 04/31] Add avr32-specific parity functions

From: Zeng Zhaoxiu <zhaoxiu.zeng@...il.com>

Signed-off-by: Zeng Zhaoxiu <zhaoxiu.zeng@...il.com>
---
 arch/avr32/include/asm/bitops.h | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/arch/avr32/include/asm/bitops.h b/arch/avr32/include/asm/bitops.h
index 910d537..80d7005 100644
--- a/arch/avr32/include/asm/bitops.h
+++ b/arch/avr32/include/asm/bitops.h
@@ -300,6 +300,38 @@ static inline int ffs(unsigned long word)
 #include <asm-generic/bitops/hweight.h>
 #include <asm-generic/bitops/lock.h>
 
+static inline unsigned int __arch_parity4(unsigned int w)
+{
+	w ^= w >> 2;
+	w ^= w >> 1;
+	return w & 1;
+}
+
+static inline unsigned int __arch_parity8(unsigned int w)
+{
+	w ^= w >> 4;
+	return __arch_parity4(w);
+}
+
+static inline unsigned int __arch_parity16(unsigned int w)
+{
+	w ^= w >> 8;
+	return __arch_parity8(w);
+}
+
+static inline unsigned int __arch_parity32(unsigned int w)
+{
+	w ^= w >> 16;
+	return __arch_parity16(w);
+}
+
+static inline unsigned int __arch_parity64(__u64 w)
+{
+	return __arch_parity32((unsigned int)(w >> 32) ^ (unsigned int)w);
+}
+
+#include <asm-generic/bitops/const_parity.h>
+
 extern unsigned long find_next_zero_bit_le(const void *addr,
 		unsigned long size, unsigned long offset);
 #define find_next_zero_bit_le find_next_zero_bit_le
-- 
2.5.5