linux-kernel - [PATCH 07/31] Add mips-specific parity functions

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Message-ID: <56F7785F.1090101@gmail.com>
Date:	Sun, 27 Mar 2016 14:06:23 +0800
From:	"zhaoxiu.zeng" <zhaoxiu.zeng@...il.com>
To:	Ralf Baechle <ralf@...ux-mips.org>,
	Leonid Yegoshin <Leonid.Yegoshin@...tec.com>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>
Cc:	linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org
Subject: [PATCH 07/31] Add mips-specific parity functions

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

Signed-off-by: Zeng Zhaoxiu <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>
 
-- 
2.5.5