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>
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@ -0,0 +1,8 @@
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#ifndef _GCD_H
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#define _GCD_H
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#include <linux/compiler.h>
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unsigned long gcd(unsigned long a, unsigned long b) __attribute_const__;
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#endif /* _GCD_H */
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@ -21,7 +21,7 @@ lib-y += kobject.o kref.o klist.o
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obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \
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bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \
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string_helpers.o
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string_helpers.o gcd.o
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ifeq ($(CONFIG_DEBUG_KOBJECT),y)
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CFLAGS_kobject.o += -DDEBUG
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@ -0,0 +1,18 @@
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#include <linux/kernel.h>
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#include <linux/gcd.h>
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#include <linux/module.h>
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/* Greatest common divisor */
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unsigned long gcd(unsigned long a, unsigned long b)
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{
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unsigned long r;
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if (a < b)
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swap(a, b);
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while ((r = a % b) != 0) {
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a = b;
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b = r;
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}
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return b;
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}
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EXPORT_SYMBOL_GPL(gcd);
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