linux-kernel - [PATCH] atmel_serial: Fix bad BUILD_BUG

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Message-Id: <1254845207-7608-1-git-send-email-haavard.skinnemoen@atmel.com>
Date:	Tue,  6 Oct 2009 18:06:47 +0200
From:	Haavard Skinnemoen <haavard.skinnemoen@...el.com>
To:	Nicolas Ferre <nicolas.ferre@...el.com>
Cc:	Andrew Victor <avictor.za@...il.com>, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org,
	Haavard Skinnemoen <haavard.skinnemoen@...el.com>
Subject: [PATCH] atmel_serial: Fix bad BUILD_BUG_ON() usage

is_power_of_2() appears not to be constant enough for BUILD_BUG_ON()
after the latest rework, so replace it with an open-coded test.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@...el.com>
---
 drivers/serial/atmel_serial.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c
index 3551c5c..9d948bc 100644
--- a/drivers/serial/atmel_serial.c
+++ b/drivers/serial/atmel_serial.c
@@ -1531,7 +1531,7 @@ static int __devinit atmel_serial_probe(struct platform_device *pdev)
 	void *data;
 	int ret;
 
-	BUILD_BUG_ON(!is_power_of_2(ATMEL_SERIAL_RINGSIZE));
+	BUILD_BUG_ON(ATMEL_SERIAL_RINGSIZE & (ATMEL_SERIAL_RINGSIZE - 1));
 
 	port = &atmel_ports[pdev->id];
 	port->backup_imr = 0;
-- 
1.6.0.4

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