linux-kernel - [PATCH v2 06/30] Add mips-specific parity functions

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Date:	Wed,  6 Apr 2016 16:59:29 +0800
From:	zengzhaoxiu@....com
To:	ralf@...ux-mips.org, Leonid.Yegoshin@...tec.com,
	macro@...ux-mips.org
Cc:	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
	Zhaoxiu Zeng <zhaoxiu.zeng@...il.com>
Subject: [PATCH v2 06/30] Add mips-specific parity functions

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

Lifted from arch_hweight.h

Signed-off-by: Zhaoxiu Zeng <zhaoxiu.zeng@...il.com>
---
 arch/mips/include/asm/arch_parity.h | 44 +++++++++++++++++++++++++++++++++++++
 arch/mips/include/asm/bitops.h      |  3 +++
 2 files changed, 47 insertions(+)
 create mode 100644 arch/mips/include/asm/arch_parity.h

diff --git a/arch/mips/include/asm/arch_parity.h b/arch/mips/include/asm/arch_parity.h
new file mode 100644
index 0000000..23b3c23
--- /dev/null
+++ b/arch/mips/include/asm/arch_parity.h
@@ -0,0 +1,44 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ */
+#ifndef _ASM_ARCH_PARITY_H
+#define _ASM_ARCH_PARITY_H
+
+#ifdef ARCH_HAS_USABLE_BUILTIN_POPCOUNT
+
+#include <asm/types.h>
+
+static inline unsigned int __arch_parity32(unsigned int w)
+{
+	return __builtin_popcount(w) & 1;
+}
+
+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);
+}
+
+static inline unsigned int __arch_parity64(__u64 w)
+{
+	return (unsigned int)__builtin_popcountll(w) & 1;
+}
+
+#else
+#include <asm-generic/bitops/arch_hweight.h>
+#include <asm-generic/bitops/arch_parity.h>
+#endif
+
+#endif /* _ASM_ARCH_PARITY_H */
diff --git a/arch/mips/include/asm/bitops.h b/arch/mips/include/asm/bitops.h
index ce9666c..0b87734 100644
--- a/arch/mips/include/asm/bitops.h
+++ b/arch/mips/include/asm/bitops.h
@@ -626,6 +626,9 @@ static inline int ffs(int word)
 #include <asm/arch_hweight.h>
 #include <asm-generic/bitops/const_hweight.h>
 
+#include <asm/arch_parity.h>
+#include <asm-generic/bitops/const_parity.h>
+
 #include <asm-generic/bitops/le.h>
 #include <asm-generic/bitops/ext2-atomic.h>
 
-- 
2.5.0