linux-kernel - [patch V4 04/31] bitops: Add blackfin-specific parity functions

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Message-Id: <1462957796-24444-1-git-send-email-zengzhaoxiu@163.com>
Date:	Wed, 11 May 2016 17:09:55 +0800
From:	zengzhaoxiu@....com
To:	linux-kernel@...r.kernel.org
Cc:	Zhaoxiu Zeng <zhaoxiu.zeng@...il.com>,
	Steven Miao <realmz6@...il.com>,
	adi-buildroot-devel@...ts.sourceforge.net
Subject: [patch V4 04/31] bitops: Add blackfin-specific parity functions

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

Signed-off-by: Zhaoxiu Zeng <zhaoxiu.zeng@...il.com>
---
 arch/blackfin/include/asm/bitops.h | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/arch/blackfin/include/asm/bitops.h b/arch/blackfin/include/asm/bitops.h
index b298b65..6609b7e 100644
--- a/arch/blackfin/include/asm/bitops.h
+++ b/arch/blackfin/include/asm/bitops.h
@@ -23,6 +23,7 @@
 #include <asm-generic/bitops/sched.h>
 #include <asm-generic/bitops/ffs.h>
 #include <asm-generic/bitops/const_hweight.h>
+#include <asm-generic/bitops/const_parity.h>
 #include <asm-generic/bitops/lock.h>
 
 #include <asm-generic/bitops/ext2-atomic.h>
@@ -137,4 +138,34 @@ static inline unsigned int __arch_hweight8(unsigned int w)
 	return __arch_hweight32(w & 0xff);
 }
 
+/*
+ * parityN: returns the parity of a N-bit word,
+ * i.e. the number of 1-bits in w modulo 2.
+ */
+
+static inline unsigned int __arch_parity32(unsigned int w)
+{
+	return __arch_hweight32(w) & 1;
+}
+
+static inline unsigned int __arch_parity64(__u64 w)
+{
+	return __arch_parity32((unsigned int)(w >> 32) ^ (unsigned int)w);
+}
+
+static inline unsigned int __arch_parity16(unsigned int w)
+{
+	return __arch_parity32(w & 0xffff);
+}
+
+static inline unsigned int __arch_parity8(unsigned int w)
+{
+	return __arch_parity32(w & 0xff);
+}
+
+static inline unsigned int __arch_parity4(unsigned int w)
+{
+	return __arch_parity32(w & 0xf);
+}
+
 #endif				/* _BLACKFIN_BITOPS_H */
-- 
2.7.4