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From: Florian Fainelli <florian@openwrt.org>
Date: Mon, 1 Jun 2009 13:57:09 +0200
Subject: [PATCH 1/9] kernel: export sound/core/pcm_timer.c gcd implementation
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To: linux-kernel@vger.kernel.org, Takashi Iwai <tiwai@suse.de>,
       akpm <akpm@linux-foundation.org>, linux-mips@linux-mips.org,
       Ralf Baechle <ralf@linux-mips.org>, Ingo Molnar <mingo@elte.hu>
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This patch exports the gcd implementation from
sound/core/pcm_timer.c into include/linux/kernel.h.
AR7 uses it in its clock routines.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
---
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 883cd44..878a27a 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -147,6 +147,22 @@ extern int _cond_resched(void);
 		(__x < 0) ? -__x : __x;		\
 	})
 
+/* Greatest common divisor */
+static inline unsigned long gcd(unsigned long a, unsigned long b)
+{
+        unsigned long r;
+        if (a < b) {
+                r = a;
+                a = b;
+                b = r;
+        }
+        while ((r = a % b) != 0) {
+                a = b;
+                b = r;
+        }
+        return b;
+}
+
 #ifdef CONFIG_PROVE_LOCKING
 void might_fault(void);
 #else
diff --git a/sound/core/pcm_timer.c b/sound/core/pcm_timer.c
index ca8068b..e9dbf62 100644
--- a/sound/core/pcm_timer.c
+++ b/sound/core/pcm_timer.c
@@ -20,6 +20,7 @@
  */
 
 #include <linux/time.h>
+#include <linux/kernel.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/timer.h>
@@ -28,22 +29,6 @@
  *  Timer functions
  */
 
-/* Greatest common divisor */
-static unsigned long gcd(unsigned long a, unsigned long b)
-{
-	unsigned long r;
-	if (a < b) {
-		r = a;
-		a = b;
-		b = r;
-	}
-	while ((r = a % b) != 0) {
-		a = b;
-		b = r;
-	}
-	return b;
-}
-
 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream)
 {
 	unsigned long rate, mult, fsize, l, post;