Re: [PATCH v2 27/33] s390/mm: Define KMSAN metadata for vmalloc and modules

[Alexander Potapenko]

On Tue, Nov 21, 2023 at 11:07 PM Ilya Leoshkevich <iii@xxxxxxxxxxxxx> wrote:
>
> The pages for the KMSAN metadata associated with most kernel mappings
> are taken from memblock by the common code. However, vmalloc and module
> metadata needs to be defined by the architectures.
>
> Be a little bit more careful than x86: allocate exactly MODULES_LEN
> for the module shadow and origins, and then take 2/3 of vmalloc for
> the vmalloc shadow and origins. This ensures that users passing small
> vmalloc= values on the command line do not cause module metadata
> collisions.
>
> Signed-off-by: Ilya Leoshkevich <iii@xxxxxxxxxxxxx>
Reviewed-by: Alexander Potapenko <glider@xxxxxxxxxx>

(hope some s390 maintainer acks this as well)