mm: madvise allow remove operation for hugetlbfs

Orabug: 21652814

Now that we have hole punching support for hugetlbfs, we can
also support the MADV_REMOVE interface to it.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
(cherry picked from commit 8f787c8989ce599cbf0feb10ecea912d07111439)
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>

diff --git a/mm/madvise.c b/mm/madvise.c
index d551475517bfd8867dca18ea23657216a0d2364a..c4a1027e36b8f64d9056a2319dfb0c424fe43a8a 100644 (file)
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -299,7 +299,7 @@ static long madvise_remove(struct vm_area_struct *vma,
 
        *prev = NULL;   /* tell sys_madvise we drop mmap_sem */
 
-       if (vma->vm_flags & (VM_LOCKED | VM_HUGETLB))
+       if (vma->vm_flags & VM_LOCKED)
                return -EINVAL;
 
        f = vma->vm_file;