Re: [PATCH 03/32] kmsan: Disable KMSAN when DEFERRED_STRUCT_PAGE_INIT is enabled

Alexander Potapenko
2023-11-16T09:42:18Z

On Wed, Nov 15, 2023 at 9:34 PM Ilya Leoshkevich <iii@linux.ibm.com> wrote:
>
> KMSAN relies on memblock returning all available pages to it
> (see kmsan_memblock_free_pages()). It partitions these pages into 3
> categories: pages available to the buddy allocator, shadow pages and
> origin pages. This partitioning is static.
>
> If new pages appear after kmsan_init_runtime(), it is considered
> an error. DEFERRED_STRUCT_PAGE_INIT causes this, so mark it as
> incompatible with KMSAN.

In the future we could probably collect the deferred pages as well,
but it's okay to disable KMSAN for now.

> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Alexander Potapenko <glider@google.com>