Re: [PATCH 1/2] moduleparams: Add hex type parameter

[Paul Menzel]

Dear Linus, dear Christian,


Am 02.07.20 um 21:42 schrieb Linus Torvalds:
> On Thu, Jul 2, 2020 at 7:42 AM Christian KÃnig <christian.koenig@xxxxxxx> wrote:
> > I'm just not sure how well this is received upstream because it only
> > covers u32
> >
> > On the other hand that is probably also the most used.
>
> Not necessarily true. I'd argue that "unsigned long"  is equally
> possible for some bit mask (or other hex-likely) type.
>
> So don't call it just "hex". Call it "hexint" (the hex does imply
> "unsigned", I feel - showing hex numbers with a sign sounds insane).
>
> That way, if somebody ends up wanting it for unsigned long values,
> we're not stuck.

Good idea. Don.e

> Another option is to just say that hex values always have bit _sizes_.
> So "hex32" and "hex64" would also make sense as names to me.

I went for int to be consistent in the naming, and kstrtouint is used in 
the macro.

> While at it, should the hex numbers always be padded out to the size?
> The example Paul used doesn't have that issue (high bit being set).
>
> Bbut often it may make sense to show a 32-bit hex number as "%#08x"
> because it really makes things clearer when you're looking at high
> bits, say.
>
> It's really hard to tell the difference between "just bit 27 set" and
> "just bit 31" set otherwise, and that's not all that uncommon when the
> bitmasks are sparse.

Also good idea. Done.

I just sent out the v2.


Kind regards,

Paul