linux-kernel - [RFC] media: stb0899: use sign_extend8 instead of manual work

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Message-Id: <1421083700-25258-3-git-send-email-martink@posteo.de>
Date:	Mon, 12 Jan 2015 18:28:19 +0100
From:	Martin Kepplinger <martink@...teo.de>
To:	mingo@...nel.org
Cc:	peterz@...radead.org, paulmck@...ux.vnet.ibm.com, tytso@....edu,
	maxime.coquelin@...com, linux@...ck-us.net,
	linux-kernel@...r.kernel.org, Martin Kepplinger <martink@...teo.de>
Subject: [RFC] media: stb0899: use sign_extend8 instead of manual work

Example change, using new sign_extend functions.
---
 drivers/media/dvb-frontends/stb0899_algo.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/media/dvb-frontends/stb0899_algo.c b/drivers/media/dvb-frontends/stb0899_algo.c
index 93596e0..7bbcfde 100644
--- a/drivers/media/dvb-frontends/stb0899_algo.c
+++ b/drivers/media/dvb-frontends/stb0899_algo.c
@@ -19,6 +19,7 @@
 	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
+#include <linux/bitops.h>
 #include "stb0899_drv.h"
 #include "stb0899_priv.h"
 #include "stb0899_reg.h"
@@ -1490,9 +1491,7 @@ enum stb0899_status stb0899_dvbs2_algo(struct stb0899_state *state)
 		/* Store signal parameters	*/
 		offsetfreq = STB0899_READ_S2REG(STB0899_S2DEMOD, CRL_FREQ);
 
-		/* sign extend 30 bit value before using it in calculations */
-		if (offsetfreq & (1 << 29))
-			offsetfreq |= -1 << 30;
+		offsetfreq = sign_extend32(offset_freq, 29);
 
 		offsetfreq = offsetfreq / ((1 << 30) / 1000);
 		offsetfreq *= (internal->master_clk / 1000000);
-- 
2.1.4

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