Re: [patch 3/6] futex: Get rid of the val2 conditional dance

[Thomas Gleixner]

On Fri, Apr 23 2021 at 18:40, André Almeida wrote:
>>   
>> -	return do_futex(uaddr, op, val, tp, uaddr2, val2, val3);
>> +	return do_futex(uaddr, op, val, tp, uaddr2, (unsigned long)utime, val3);
>
> Given do_futex()'s type signature, I think it makes more sense to cast 
> utime to u32.

It's a pointer which you better force cast to unsigned long first.

So the explicit thing would be '(u32)(unsigned long) utime' which is
what the val2 dance stupidly did with 'int'

		val2 = (int) (unsigned long) utime;

But with doing it at function call argument it's implicit, because the

  unsigned long  to u32 conversion is well defined

while

  (u32)ptr

is only well defined on 32bit.

Thanks,

        tglx