aboutsummaryrefslogtreecommitdiffstats
path: root/lib
diff options
context:
space:
mode:
authorFlorian Fainelli <florian@openwrt.org>2009-06-17 19:28:38 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-18 16:04:05 -0400
commitd2829224619866daf336141b71550e223a198838 (patch)
tree59e12165ac9dea56a04f3b46ec098f4292f67481 /lib
parenteae9d2ba0cfc27a2ad9765f23efb98fb80d80234 (diff)
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>
Diffstat (limited to 'lib')
-rw-r--r--lib/Makefile2
-rw-r--r--lib/gcd.c18
2 files changed, 19 insertions, 1 deletions
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
21 21
22obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \ 22obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \
23 bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \ 23 bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \
24 string_helpers.o 24 string_helpers.o gcd.o
25 25
26ifeq ($(CONFIG_DEBUG_KOBJECT),y) 26ifeq ($(CONFIG_DEBUG_KOBJECT),y)
27CFLAGS_kobject.o += -DDEBUG 27CFLAGS_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 @@
1#include <linux/kernel.h>
2#include <linux/gcd.h>
3#include <linux/module.h>
4
5/* Greatest common divisor */
6unsigned long gcd(unsigned long a, unsigned long b)
7{
8 unsigned long r;
9
10 if (a < b)
11 swap(a, b);
12 while ((r = a % b) != 0) {
13 a = b;
14 b = r;
15 }
16 return b;
17}
18EXPORT_SYMBOL_GPL(gcd);