diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/huge_memory.c | 16 | ||||
| -rw-r--r-- | mm/madvise.c | 8 |
2 files changed, 24 insertions, 0 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 76350793289..620891f4e54 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; diff --git a/mm/madvise.c b/mm/madvise.c index 319528b8db7..ecde40a401c 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -71,6 +71,11 @@ static long madvise_behavior(struct vm_area_struct * vma, if (error) goto out; break; + case MADV_HUGEPAGE: + error = hugepage_madvise(&new_flags); + if (error) + goto out; + break; } if (new_flags == vma->vm_flags) { @@ -283,6 +288,9 @@ madvise_behavior_valid(int behavior) case MADV_MERGEABLE: case MADV_UNMERGEABLE: #endif +#ifdef CONFIG_TRANSPARENT_HUGEPAGE + case MADV_HUGEPAGE: +#endif return 1; default: |