On Fri, Aug 23, 2024 at 09:07:01PM GMT, Lorenzo Stoakes wrote:
[snip]
> void unlink_file_vma_batch_init(struct unlink_vma_file_batch *vb)
> @@ -1426,9 +1536,10 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap,
> struct vm_area_struct *vma = *vmap;
> unsigned long vma_start = vma->vm_start;
> struct mm_struct *mm = vma->vm_mm;
> - struct vm_area_struct *new_vma, *prev;
> + struct vm_area_struct *new_vma;
> bool faulted_in_anon_vma = true;
> VMA_ITERATOR(vmi, mm, addr);
> + VMG_VMA_STATE(vmg, &vmi, NULL, vma, addr, addr + len);
>
> /*
> * If anonymous vma has not yet been faulted, update new pgoff
> @@ -1439,11 +1550,18 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap,
> faulted_in_anon_vma = false;
> }
>
> - new_vma = find_vma_prev(mm, addr, &prev);
> + new_vma = find_vma_prev(mm, addr, &vmg.prev);
> if (new_vma && new_vma->vm_start < addr + len)
> return NULL; /* should never get here */
>
> - new_vma = vma_merge_new_vma(&vmi, prev, vma, addr, addr + len, pgoff);
> + vmg.vma = NULL; /* New VMA range. */
> + vmg.pgoff = pgoff;
> + vmg.next = vma_next(&vmi);
> + vma_prev(&vmi);
> + vma_iter_next_range(&vmi);
> +
> + new_vma = vma_merge_new_range(&vmg);
> +
> if (new_vma) {
> /*
> * Source vma may have been merged into new_vma
[snip]
Hi Andrew - could you squash the attached fix-patch into this please? As
there is an issue with a CONFIG_DEBUG_VM check firing when copy_vma()
unnecessarily moves the VMA iterator as reported at [0].
Thanks!
[0]: https://lore.kernel.org/linux-mm/202408271452.c842a71d-lkp@xxxxxxxxx/
----8<----
