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    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


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