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From: Andrey Panov <rockford@yandex.ru>
To: barebox@lists.infradead.org
Subject: [PATCH 01/18] lib: Add gcd() function.
Date: Mon,  2 Mar 2015 23:21:45 +0300	[thread overview]
Message-ID: <1425327722-28232-2-git-send-email-rockford@yandex.ru> (raw)
In-Reply-To: <1425327722-28232-1-git-send-email-rockford@yandex.ru>

    It calculates greatest common divisor and is
    compiled in only if CONFIG_GCD is selected.

Signed-off-by: Andrey Panov <rockford@yandex.ru>
---
 include/linux/gcd.h | 12 ++++++++++++
 lib/Kconfig         |  3 +++
 lib/Makefile        |  1 +
 lib/gcd.c           | 19 +++++++++++++++++++
 4 files changed, 35 insertions(+)
 create mode 100644 include/linux/gcd.h
 create mode 100644 lib/gcd.c

diff --git a/include/linux/gcd.h b/include/linux/gcd.h
new file mode 100644
index 0000000..6405b27
--- /dev/null
+++ b/include/linux/gcd.h
@@ -0,0 +1,12 @@
+#ifndef _GCD_H
+#define _GCD_H
+
+#include <linux/compiler.h>
+
+#if !defined(swap)
+#define swap(x, y) do { typeof(x) z = x; x = y; y = z; } while (0)
+#endif
+
+unsigned long gcd(unsigned long a, unsigned long b) __attribute_const__;
+
+#endif /* _GCD_H */
diff --git a/lib/Kconfig b/lib/Kconfig
index 62695f1..4b9b472 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -55,6 +55,9 @@ config LIBMTD
 config STMP_DEVICE
 	bool
 
+config GCD
+	bool
+
 source lib/gui/Kconfig
 
 source lib/bootstrap/Kconfig
diff --git a/lib/Makefile b/lib/Makefile
index b97e52d..6f70f01 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -52,3 +52,4 @@ obj-$(CONFIG_STMP_DEVICE) += stmp-device.o
 obj-y			+= wchar.o
 obj-y			+= libfile.o
 obj-y			+= bitmap.o
+obj-$(CONFIG_GCD)	+= gcd.o
diff --git a/lib/gcd.c b/lib/gcd.c
new file mode 100644
index 0000000..dde8c9e
--- /dev/null
+++ b/lib/gcd.c
@@ -0,0 +1,19 @@
+#include <linux/kernel.h>
+#include <linux/gcd.h>
+
+/* Greatest common divisor */
+unsigned long gcd(unsigned long a, unsigned long b)
+{
+	unsigned long r;
+
+	if (a < b)
+		swap(a, b);
+
+	if (!b)
+		return a;
+	while ((r = a % b) != 0) {
+		a = b;
+		b = r;
+	}
+	return b;
+}
-- 
2.1.4


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  reply	other threads:[~2015-03-02 20:22 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-02 20:21 [PATCH 00/18] Update support for RK3188, Radxa Rock board Andrey Panov
2015-03-02 20:21 ` Andrey Panov [this message]
2015-03-03  7:45   ` [PATCH 01/18] lib: Add gcd() function Sascha Hauer
2015-03-02 20:21 ` [PATCH 02/18] CLK: Add support for composite clock from Linux kernel Andrey Panov
2015-03-03  7:48   ` Sascha Hauer
2015-03-02 20:21 ` [PATCH 03/18] CLK: Add fractional divider clock support " Andrey Panov
2015-03-03  7:51   ` Sascha Hauer
2015-03-02 20:21 ` [PATCH 04/18] CLK: clk-mux: Respect CLK_MUX_HIWORD_MASK flag Andrey Panov
2015-03-02 20:21 ` [PATCH 05/18] CLK: clk-divider: Respect CLK_DIVIDER_HIWORD_MASK flag Andrey Panov
2015-03-02 20:21 ` [PATCH 06/18] CLK: clk-divider: Introduce clk_divider_alloc() and *_free() routines Andrey Panov
2015-03-02 20:21 ` [PATCH 07/18] CLK: clk-divider: Respect CLK_DIVIDER_POWER_OF_TWO flag Andrey Panov
2015-03-02 20:21 ` [PATCH 08/18] CLK: Check and do not allow to register clock twice Andrey Panov
2015-03-03  9:03   ` Sascha Hauer
2015-03-02 20:21 ` [PATCH 09/18] CLK: Add helper defines to barebox-wrapper.h for easier porting of drivers from Linux kernel Andrey Panov
2015-03-02 20:21 ` [PATCH 10/18] NET: arc_emac: Update for newer DTS, support for Rockchip .compatible Andrey Panov
2015-03-02 20:21 ` [PATCH 11/18] MMC: dw_mmc: Add support for PIO mode and Rockchip variant of this hardware Andrey Panov
2015-03-02 20:21 ` [PATCH 12/18] ARM: Rockchip: Remove unused files from mach-rockchip Andrey Panov
2015-03-02 20:21 ` [PATCH 13/18] ARM: Rockchip: Update Kconfig Andrey Panov
2015-03-02 20:21 ` [PATCH 14/18] ARM: Rockchip: Update clk driver from Linux kernel for use with newer DTS Andrey Panov
2015-03-02 20:21 ` [PATCH 15/18] ARM: Rockchip: Use newer DTS for Radxa Rock board Andrey Panov
2015-03-02 20:22 ` [PATCH 16/18] ARM: Rockchip: Update " Andrey Panov
2015-03-02 20:22 ` [PATCH 17/18] ARM: Rockchip: Add Radxa Rock defconfig Andrey Panov
2015-03-02 20:22 ` [PATCH 18/18] ARM: Rockchip: Add documentation Andrey Panov
2015-03-02 20:54 ` [PATCH 00/18] Update support for RK3188, Radxa Rock board Antony Pavlov

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