linux-kernel - [RFC][PATCH] arch: sh: use sign

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Message-Id: <1423739490-5187-2-git-send-email-martink@posteo.de>
Date:	Thu, 12 Feb 2015 12:11:30 +0100
From:	Martin Kepplinger <martink@...teo.de>
To:	linux@...ck-us.net, mingo@...nel.org, hpa@...or.com
Cc:	peterz@...radead.org, torvalds@...ux-foundation.org,
	jsrhbz@...argh.force9.co.uk,
	christoph.muellner@...obroma-systems.com, linux@...musvillemoes.dk,
	paulmck@...ux.vnet.ibm.com, tglx@...utronix.de,
	akpm@...ux-foundation.org, maxime.coquelin@...com,
	linux-kernel@...r.kernel.org, tytso@....edu,
	linux-tip-commits@...r.kernel.org,
	Martin Kepplinger <martink@...teo.de>
Subject: [RFC][PATCH] arch: sh: use sign_extend64() for sign extension

Signed-off-by: Martin Kepplinger <martink@...teo.de>
---
 arch/sh/kernel/traps_64.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/sh/kernel/traps_64.c b/arch/sh/kernel/traps_64.c
index 112ea11..4e04261 100644
--- a/arch/sh/kernel/traps_64.c
+++ b/arch/sh/kernel/traps_64.c
@@ -25,6 +25,7 @@
 #include <linux/sysctl.h>
 #include <linux/module.h>
 #include <linux/perf_event.h>
+#include <linux/bitops.h>
 #include <asm/uaccess.h>
 #include <asm/io.h>
 #include <asm/alignment.h>
@@ -101,7 +102,7 @@ static int generate_and_check_address(struct pt_regs *regs,
 	if (displacement_not_indexed) {
 		__s64 displacement;
 		displacement = (opcode >> 10) & 0x3ff;
-		displacement = ((displacement << 54) >> 54); /* sign extend */
+		displacement = sign_extend64(displacement, 9);
 		addr = (__u64)((__s64)base_address + (displacement << width_shift));
 	} else {
 		__u64 offset;
-- 
2.1.4

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