linux-kernel - [PATCH 1/8] add lib/gcd.c

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Date:	Thu, 4 Jun 2009 16:15:07 +0200
From:	Florian Fainelli <florian@...nwrt.org>
To:	"Linux-MIPS" <linux-mips@...ux-mips.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Takashi Iwai <tiwai@...e.de>,
	Ralf Baechle <ralf@...ux-mips.org>
Subject: [PATCH 1/8] add lib/gcd.c

This patch adds lib/gcd.c which contains a greatest
common divider implementation taken from
sound/core/pcm_timer.c

Signed-off-by: Florian Fainelli <florian@...nwrt.org>
---
diff --git a/include/linux/gcd.h b/include/linux/gcd.h
new file mode 100644
index 0000000..69f5e8a
--- /dev/null
+++ b/include/linux/gcd.h
@@ -0,0 +1,8 @@
+#ifndef _GCD_H
+#define _GCD_H
+
+#include <linux/compiler.h>
+
+unsigned long gcd(unsigned long a, unsigned long b) __attribute_const__;
+
+#endif /* _GCD_H */
diff --git a/lib/Kconfig b/lib/Kconfig
index 8ade0a7..70a9906 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -10,6 +10,9 @@ menu "Library routines"
 config BITREVERSE
 	tristate
 
+config GCD
+	bool
+
 config GENERIC_FIND_FIRST_BIT
 	bool
 
diff --git a/lib/Makefile b/lib/Makefile
index 33a40e4..389bdd2 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -57,6 +57,7 @@ obj-$(CONFIG_CRC_ITU_T)	+= crc-itu-t.o
 obj-$(CONFIG_CRC32)	+= crc32.o
 obj-$(CONFIG_CRC7)	+= crc7.o
 obj-$(CONFIG_LIBCRC32C)	+= libcrc32c.o
+obj-$(CONFIG_GCD)	+= gcd.o
 obj-$(CONFIG_GENERIC_ALLOCATOR) += genalloc.o
 
 obj-$(CONFIG_ZLIB_INFLATE) += zlib_inflate/
diff --git a/lib/gcd.c b/lib/gcd.c
new file mode 100644
index 0000000..fbf81a8
--- /dev/null
+++ b/lib/gcd.c
@@ -0,0 +1,20 @@
+#include <linux/gcd.h>
+#include <linux/module.h>
+
+/* Greatest common divisor */
+unsigned long gcd(unsigned long a, unsigned long b)
+{
+	unsigned long r;
+
+	if (a < b) {
+		r = a;
+		a = b;
+	b = r;
+	}
+	while ((r = a % b) != 0) {
+		a = b;
+		b = r;
+	}
+	return b;
+}
+EXPORT_SYMBOL(gcd);
--
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