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-rw-r--r--mm/huge_memory.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 763507932898..620891f4e54f 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -896,6 +896,22 @@ out:
return ret;
}
+int hugepage_madvise(unsigned long *vm_flags)
+{
+ /*
+ * Be somewhat over-protective like KSM for now!
+ */
+ if (*vm_flags & (VM_HUGEPAGE | VM_SHARED | VM_MAYSHARE |
+ VM_PFNMAP | VM_IO | VM_DONTEXPAND |
+ VM_RESERVED | VM_HUGETLB | VM_INSERTPAGE |
+ VM_MIXEDMAP | VM_SAO))
+ return -EINVAL;
+
+ *vm_flags |= VM_HUGEPAGE;
+
+ return 0;
+}
+
void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd)
{
struct page *page;