Re: [PATCH v7] rust: kernel: add support for bits/genmask macros

["Alexandre Courbot" <acourbot@nvidia.com>]

On Wed Jul 2, 2025 at 10:25 PM JST, Alexandre Courbot wrote:
>> +impl_genmask_fn!(
>> +    u64,
>> +    /// # Examples
>> +    ///
>> +    /// ```
>> +    /// # use kernel::bits::genmask_u64;
>> +    /// let mask = genmask_u64(21..=39);
>> +    /// assert_eq!(mask, 0x000000ffffe00000);
>
> I think we should also have 2 examples that show the behavior at the
> limits (i.e. `0..=0` and `0..=63` here ; possibly others if you can see
> interesting cases.). They are useful to understand how the function
> actually works, and would also have caught the errors I pointed out
> above.

Also one last nit: users will count the bits on these examples, so to
make that task easier, please write long hexadecimal values as
`0x0000_00ff_ffe0_0000`. :)