Re: [PATCH v1 2/3] selftests/mm: uffd-unit-tests support for hugepages > 2M

On Tue, Mar 18, 2025 at 05:43:40PM +0000, Ryan Roberts wrote:

uffd-unit-tests uses a memory area with a fixed 32M size. Then it calculates the number of pages by dividing by page_size, which itself is either the base page size or the PMD huge page size depending on the test config. For the latter, we end up with nr_pages=1 for arm64 16K base pages, and nr_pages=0 for 64K base pages. This doesn't end well.

So let's make the 32M size a floor and also ensure that we have at least 2 pages given the PMD size. With this change, the tests pass on arm64 64K base page size configuration.

Signed-off-by: Ryan Roberts ryan.roberts@arm.com

Acked-by: Peter Xu peterx@redhat.com