Hi Sasha,

Please do NOT backport commit dd83609b8898 alone to stable. This patch causes a regression in fallocate(PUNCH_HOLE) operations where pages are not freed immediately, as reported by Mark Brown.

The fix for this regression is already in linux-next as commit 91a830422707 ("hugetlbfs: check for shareable lock before calling huge_pmd_unshare()").

Please backport both commits together to avoid introducing the regression in stable kernels: - dd83609b88986f4add37c0871c3434310652ebd5 ("hugetlbfs: skip VMAs without shareable locks in hugetlb_vmdelete_list") - 91a830422707a62629fc4fbf8cdc3c8acf56ca64 ("hugetlbfs: check for shareable lock before calling huge_pmd_unshare()")

Thanks, Deepanshu Kartikey