linux-kernel - [PATCH] staging: pi433: use div

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Message-Id: <20170728132339.332897-1-arnd@arndb.de>
Date:   Fri, 28 Jul 2017 15:23:12 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Marcus Wolf <linux@...f-Entwicklungen.de>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH] staging: pi433: use div_u64 for 64-bit division

I ran into this link error on an ARM OABI build:

drivers/staging/pi433/rf69.o: In function `rf69_set_frequency':
rf69.c:(.text+0xc9c): undefined reference to `__udivdi3'

No idea why I didn't see it with the default EABI configurations,
but the right solution here seems to be to use div_u64()
to get the external division implementation.

Fixes: 874bcba65f9a ("staging: pi433: New driver")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/staging/pi433/rf69.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/pi433/rf69.c b/drivers/staging/pi433/rf69.c
index e391ce777bc7..e5267b5638c0 100644
--- a/drivers/staging/pi433/rf69.c
+++ b/drivers/staging/pi433/rf69.c
@@ -238,7 +238,7 @@ int rf69_set_frequency(struct spi_device *spi, u32 frequency)
 	do_div(f_step, 524288); //  524288 = 2^19
 
 	// check input value
-	f_max = f_step * 8388608 / factor;
+	f_max = div_u64(f_step * 8388608, factor);
 	if (frequency > f_max)
 	{
 		dev_dbg(&spi->dev, "setFrequency: illegal input param");
-- 
2.9.0