[KJ] [PATCH]is_power_of_2-rtc/rtc-s3c.c

[KJ] [PATCH]is_power_of_2-rtc/rtc-s3c.c

[vignesh babu]

Replacing (n & (n-1)) in the context of power of 2 checks
with is_power_of_2

Signed-off-by: vignesh babu <vignesh.babu@wipro.com>
--- 
diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index 54b6130..e20bd6f 100644
--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -20,6 +20,7 @@
 #include <linux/rtc.h>
 #include <linux/bcd.h>
 #include <linux/clk.h>
+#include <linux/log2.h>
 
 #include <asm/hardware.h>
 #include <asm/uaccess.h>
@@ -311,7 +312,7 @@ static int s3c_rtc_ioctl(struct device *dev,
 	case RTC_IRQP_SET:
 		/* check for power of 2 */
 
-		if ((arg & (arg-1)) != 0 || arg < 1) {
+		if (!is_power_of_2(arg)) {
 			ret = -EINVAL;
 			goto exit;
 		}

-- 
Vignesh Babu BM 
_____________________________________________________________ 
"Why is it that every time I'm with you, makes me believe in magic?"

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