Re: [PATCH] mm: extend max struct page size for kmsan

[Pasha Tatashin]

On Mon, Jan 30, 2023 at 8:07 AM Arnd Bergmann <arnd@xxxxxxxxxx> wrote:
>
> From: Arnd Bergmann <arnd@xxxxxxxx>
>
> After x86 has enabled support for KMSAN, it has become possible
> to have larger 'struct page' than was expected when commit
> 5470dea49f53 ("mm: use mm_zero_struct_page from SPARC on all 64b
> architectures") was merged:
>
> include/linux/mm.h:156:10: warning: no case matching constant switch condition '96'
>         switch (sizeof(struct page)) {
>
> Extend the maximum accordingly.
>
> Fixes: 5470dea49f53 ("mm: use mm_zero_struct_page from SPARC on all 64b architectures")

No need to add the above "Fixes:". The above patch works as expected
everywhere where the struct page is 80 bytes or smaller (as specified
by the comment).

I also agree with others that the KMSAN should be part of page_ext
instead of increasing the complexity of "struct page".

Otherwise,
Reviewed-by: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>

Thanks,
Pasha