Re: [PATCH v4] selftest/vm: add mremap expand merge offset test

On 02.01.23 17:11, Lorenzo Stoakes wrote:

Add a test to assert that we can mremap() and expand a mapping starting from an offset within an existing mapping. We unmap the last page in a 3 page mapping to ensure that the remap should always succeed, before remapping from the 2nd page.

This is additionally a regression test for the issue solved in "mm, mremap: fix mremap() expanding vma with addr inside vma" and confirmed to fail prior to the change and pass after it.

Finally, this patch updates the existing mremap expand merge test to check error conditions and reduce code duplication between the two tests.

Signed-off-by: Lorenzo Stoakes lstoakes@gmail.com

Acked-by: David Hildenbrand david@redhat.com