mm, selftests: test return value of munmap for MAP_HUGETLB memory

When MAP_HUGETLB memory is unmapped, the length must be hugepage aligned,
otherwise it fails with -EINVAL.

All tests currently behave correctly, but it's better to explcitly test
the return value for completeness and document the requirement, especially
if users copy map_hugetlb.c as a sample implementation.

Signed-off-by: David Rientjes <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Davide Libenzi <[email protected]>
Cc: Luiz Capitulino <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Joern Engel <[email protected]>
Cc: Jianguo Wu <[email protected]>
Cc: Eric B Munson <[email protected]>
Acked-by: Michael Ellerman <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions