Re: Rust kernel policy

Martin Uecker
2025-02-21T23:37:17Z

Am Freitag, dem 21.02.2025 um 17:24 -0500 schrieb Steven Rostedt:
> On Fri, 21 Feb 2025 11:30:41 -0800
> Linus Torvalds <torvalds@linux-foundation.org> wrote:
>
> > And yes, it's wrong in general. The problems with "x < 0" warning for
> > an unsigned 'x' are deep and fundamental, and macros that take various
> > types is only one (perhaps more obvious) example of how brokent that
> > garbage is.
>
> The bug I recently fixed, and I still constantly make, where this does
> help, is the difference between size_t vs ssize_t. I keep forgetting that
> size_t is unsigned, and I'll check a return of a function that returns
> negative on error with it.
>
> If I could just get a warning for this stupid mistake:
>
> size_t ret;
>
> ret = func();
> if (ret < 0)
> error();
>
>
> I'd be very happy.
>

GCC has this warning, it is called -Wtype-limits

https://godbolt.org/z/M787vjhfo

It is activated by -Wextra.

(anyway, not at all related to my proposal)

Martin