diff options
Diffstat (limited to 'mm/vma.h')
| -rw-r--r-- | mm/vma.h | 26 |
1 files changed, 17 insertions, 9 deletions
@@ -59,6 +59,17 @@ enum vma_merge_state { VMA_MERGE_SUCCESS, }; +enum vma_merge_flags { + VMG_FLAG_DEFAULT = 0, + /* + * If we can expand, simply do so. We know there is nothing to merge to + * the right. Does not reset state upon failure to merge. The VMA + * iterator is assumed to be positioned at the previous VMA, rather than + * at the gap. + */ + VMG_FLAG_JUST_EXPAND = 1 << 0, +}; + /* Represents a VMA merge operation. */ struct vma_merge_struct { struct mm_struct *mm; @@ -75,6 +86,7 @@ struct vma_merge_struct { struct mempolicy *policy; struct vm_userfaultfd_ctx uffd_ctx; struct anon_vma_name *anon_name; + enum vma_merge_flags merge_flags; enum vma_merge_state state; }; @@ -99,6 +111,7 @@ static inline pgoff_t vma_pgoff_offset(struct vm_area_struct *vma, .flags = flags_, \ .pgoff = pgoff_, \ .state = VMA_MERGE_START, \ + .merge_flags = VMG_FLAG_DEFAULT, \ } #define VMG_VMA_STATE(name, vmi_, prev_, vma_, start_, end_) \ @@ -118,6 +131,7 @@ static inline pgoff_t vma_pgoff_offset(struct vm_area_struct *vma, .uffd_ctx = vma_->vm_userfaultfd_ctx, \ .anon_name = anon_vma_name(vma_), \ .state = VMA_MERGE_START, \ + .merge_flags = VMG_FLAG_DEFAULT, \ } #ifdef CONFIG_DEBUG_VM_MAPLE_TREE @@ -241,15 +255,9 @@ static inline void vms_abort_munmap_vmas(struct vma_munmap_struct *vms, * failure method of leaving a gap where the MAP_FIXED mapping failed. */ mas_set_range(mas, vms->start, vms->end - 1); - if (unlikely(mas_store_gfp(mas, NULL, GFP_KERNEL))) { - pr_warn_once("%s: (%d) Unable to abort munmap() operation\n", - current->comm, current->pid); - /* Leaving vmas detached and in-tree may hamper recovery */ - reattach_vmas(mas_detach); - } else { - /* Clean up the insertion of the unfortunate gap */ - vms_complete_munmap_vmas(vms, mas_detach); - } + mas_store_gfp(mas, NULL, GFP_KERNEL|__GFP_NOFAIL); + /* Clean up the insertion of the unfortunate gap */ + vms_complete_munmap_vmas(vms, mas_detach); } int |