* zhong jiang <zhongjiang@xxxxxxxxxx> wrote:
> when shift expoment is negative, left shift alway zero. therefore, we
> modify the logic to avoid the warining.
>
> Signed-off-by: zhong jiang <zhongjiang@xxxxxxxxxx>
> ---
> arch/x86/include/asm/futex.h | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/include/asm/futex.h b/arch/x86/include/asm/futex.h
> index b4c1f54..2425fca 100644
> --- a/arch/x86/include/asm/futex.h
> +++ b/arch/x86/include/asm/futex.h
> @@ -49,8 +49,12 @@ static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
> int cmparg = (encoded_op << 20) >> 20;
> int oldval = 0, ret, tem;
>
> - if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
> - oparg = 1 << oparg;
> + if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) {
> + if (oparg >= 0)
> + oparg = 1 << oparg;
> + else
> + oparg = 0;
> + }
Could we avoid all these complications by using an unsigned type?
Thanks,
Ingo
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