diff options
Diffstat (limited to 'mm/hugetlb.c')
| -rw-r--r-- | mm/hugetlb.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 61c52cd5f77b..bd12e8c8bc7b 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -801,8 +801,19 @@ static bool vma_has_reserves(struct vm_area_struct *vma, long chg) } /* Shared mappings always use reserves */ - if (vma->vm_flags & VM_MAYSHARE) - return true; + if (vma->vm_flags & VM_MAYSHARE) { + /* + * We know VM_NORESERVE is not set. Therefore, there SHOULD + * be a region map for all pages. The only situation where + * there is no region map is if a hole was punched via + * fallocate. In this case, there really are no reverves to + * use. This situation is indicated if chg != 0. + */ + if (chg) + return false; + else + return true; + } /* * Only the process that called mmap() has reserves for |