lkml.org 
[lkml]   [2015]   [Feb]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[RFC][PATCH] arch: sh: use sign_extend64() for sign extension
Date
Signed-off-by: Martin Kepplinger <martink@posteo.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


\
 
 \ /
  Last update: 2015-02-12 12:21    [W:0.130 / U:0.128 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site