Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit d2829224 authored by Florian Fainelli's avatar Florian Fainelli Committed by Linus Torvalds
Browse files

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: default avatarFlorian 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent eae9d2ba

include/linux/gcd.h

0 → 100644
+8 −0
Original line number Diff line number Diff line 
#ifndef _GCD_H

#define _GCD_H



#include <linux/compiler.h>



unsigned long gcd(unsigned long a, unsigned long b) __attribute_const__;



#endif /* _GCD_H */

lib/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -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

lib/gcd.c

0 → 100644
+18 −0
Original line number Diff line number Diff line 
#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);