Re: [PATCH 3/3] kasan: clean-up kconfig options descriptions

[Andrey Konovalov]

On Tue, May 10, 2022 at 1:57 PM Marco Elver <elver@xxxxxxxxxx> wrote:
>
> > -       Currently CONFIG_KASAN_GENERIC doesn't work with CONFIG_DEBUG_SLAB
> > -       (the resulting kernel does not boot).
> > +       (Incompatible with CONFIG_DEBUG_SLAB: the kernel does not boot.)
>
> Why aren't they made mutually exclusive via Kconfig constraints? Does it
> work these days?
>
> Either KASAN_GENERIC and KASAN_SW_TAGS do "depends on !DEBUG_SLAB ||
> COMPILE_TEST", or DEBUG_SLAB does "depends on !(KASAN_GENERIC || KASAN_SW_TAGS) || COMPILE_TEST".
>
> I feel DEBUG_SLAB might not be used very much these days, so perhaps
> DEBUG_SLAB should add the constraint, also given KASAN is the better
> debugging aid.

They are made exclusive: it's the KASAN option that depends on
!DEBUG_SLAB. And KASAN_HW_TAGS doesn't have this note, as it doesn't
work with SLAB at all at the moment. Moving the constraint to
DEBUG_SLAB might make sense, but let's keep this patchset as a
non-functional change. Thanks!