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authorFlorian Fainelli <florian@openwrt.org>2009-06-17 16:28:38 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-18 13:04:05 -0700
commitd2829224619866daf336141b71550e223a198838 (patch)
tree59e12165ac9dea56a04f3b46ec098f4292f67481
parenteae9d2ba0cfc27a2ad9765f23efb98fb80d80234 (diff)
downloadlinux-linaro-stable-d2829224619866daf336141b71550e223a198838.tar.gz
lib: add lib/gcd.c
This patch adds lib/gcd.c which contains a greatest common divider implementation taken from sound/core/pcm_timer.c Several usages of this new library function will be sent to subsystem maintainers. [akpm@linux-foundation.org: use swap() (pointed out by Joe)] [akpm@linux-foundation.org: just add gcd.o to obj-y, remove Kconfig changes] Signed-off-by: Florian Fainelli <florian@openwrt.org> Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com> Cc: Takashi Iwai <tiwai@suse.de> Cc: Simon Horman <horms@verge.net.au> Cc: Julius Volz <juliusv@google.com> Cc: David S. Miller <davem@davemloft.net> Cc: Patrick McHardy <kaber@trash.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/gcd.h8
-rw-r--r--lib/Makefile2
-rw-r--r--lib/gcd.c18
3 files changed, 27 insertions, 1 deletions
diff --git a/include/linux/gcd.h b/include/linux/gcd.h
new file mode 100644
index 000000000000..69f5e8a01bad
--- /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/Makefile b/lib/Makefile
index 8e9bcf9d3261..b6d1857bbf08 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -21,7 +21,7 @@ lib-y += kobject.o kref.o klist.o
obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \
bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \
- string_helpers.o
+ string_helpers.o gcd.o
ifeq ($(CONFIG_DEBUG_KOBJECT),y)
CFLAGS_kobject.o += -DDEBUG
diff --git a/lib/gcd.c b/lib/gcd.c
new file mode 100644
index 000000000000..f879033d9822
--- /dev/null
+++ b/lib/gcd.c
@@ -0,0 +1,18 @@
+#include <linux/kernel.h>
+#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)
+ swap(a, b);
+ while ((r = a % b) != 0) {
+ a = b;
+ b = r;
+ }
+ return b;
+}
+EXPORT_SYMBOL_GPL(gcd);