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David Hildenbrand
8cdc4d2701
Let's allow for making MADV_COLLAPSE succeed on areas that neither have VM_HUGEPAGE nor VM_NOHUGEPAGE when we have THP disabled unless explicitly advised (PR_THP_DISABLE_EXCEPT_ADVISED). MADV_COLLAPSE is a clear advice that we want to collapse. Note that we still respect the VM_NOHUGEPAGE flag, just like MADV_COLLAPSE always does. So consequently, MADV_COLLAPSE is now only refused on VM_NOHUGEPAGE with PR_THP_DISABLE_EXCEPT_ADVISED, including for shmem. Link: https://lkml.kernel.org/r/[email protected] Co-developed-by: Usama Arif <[email protected]> Signed-off-by: Usama Arif <[email protected]> Signed-off-by: David Hildenbrand <[email protected]> Reviewed-by: Baolin Wang <[email protected]> Reviewed-by: Lorenzo Stoakes <[email protected]> Reviewed-by: Zi Yan <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Barry Song <[email protected]> Cc: Dev Jain <[email protected]> Cc: Jann Horn <[email protected]> Cc: Johannes Weiner <[email protected]> Cc: Jonathan Corbet <[email protected]> Cc: Liam Howlett <[email protected]> Cc: Mariano Pache <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Mike Rapoport <[email protected]> Cc: Rik van Riel <[email protected]> Cc: Ryan Roberts <[email protected]> Cc: SeongJae Park <[email protected]> Cc: Shakeel Butt <[email protected]> Cc: Suren Baghdasaryan <[email protected]> Cc: Vlastimil Babka <[email protected]> Cc: Yafang <[email protected]> Signed-off-by: Andrew Morton <[email protected]>