The patch titled
Subject: mempolicy: convert to vma iterator
has been added to the -mm mm-unstable branch. Its filename is
mempolicy-convert-to-vma-iterator.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mempolicy-convert-to-vma-iterator.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx>
Subject: mempolicy: convert to vma iterator
Date: Thu, 5 Jan 2023 19:15:57 +0000
Use the vma iterator so that the iterator can be invalidated or updated
to avoid each caller doing so.
Link: https://lkml.kernel.org/r/20230105191517.3099082-19-Liam.Howlett@xxxxxxxxxx
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mempolicy.c | 25 ++++++++-----------------
1 file changed, 8 insertions(+), 17 deletions(-)
--- a/mm/mempolicy.c~mempolicy-convert-to-vma-iterator
+++ a/mm/mempolicy.c
@@ -786,24 +786,21 @@ static int vma_replace_policy(struct vm_
static int mbind_range(struct mm_struct *mm, unsigned long start,
unsigned long end, struct mempolicy *new_pol)
{
- MA_STATE(mas, &mm->mm_mt, start, start);
+ VMA_ITERATOR(vmi, mm, start);
struct vm_area_struct *prev;
struct vm_area_struct *vma;
int err = 0;
pgoff_t pgoff;
- prev = mas_prev(&mas, 0);
- if (unlikely(!prev))
- mas_set(&mas, start);
-
- vma = mas_find(&mas, end - 1);
+ prev = vma_prev(&vmi);
+ vma = vma_find(&vmi, end);
if (WARN_ON(!vma))
return 0;
if (start > vma->vm_start)
prev = vma;
- for (; vma; vma = mas_next(&mas, end - 1)) {
+ do {
unsigned long vmstart = max(start, vma->vm_start);
unsigned long vmend = min(end, vma->vm_end);
@@ -812,29 +809,23 @@ static int mbind_range(struct mm_struct
pgoff = vma->vm_pgoff +
((vmstart - vma->vm_start) >> PAGE_SHIFT);
- prev = vma_merge(mm, prev, vmstart, vmend, vma->vm_flags,
+ prev = vmi_vma_merge(&vmi, mm, prev, vmstart, vmend, vma->vm_flags,
vma->anon_vma, vma->vm_file, pgoff,
new_pol, vma->vm_userfaultfd_ctx,
anon_vma_name(vma));
if (prev) {
- /* vma_merge() invalidated the mas */
- mas_pause(&mas);
vma = prev;
goto replace;
}
if (vma->vm_start != vmstart) {
- err = split_vma(vma->vm_mm, vma, vmstart, 1);
+ err = vmi_split_vma(&vmi, vma->vm_mm, vma, vmstart, 1);
if (err)
goto out;
- /* split_vma() invalidated the mas */
- mas_pause(&mas);
}
if (vma->vm_end != vmend) {
- err = split_vma(vma->vm_mm, vma, vmend, 0);
+ err = vmi_split_vma(&vmi, vma->vm_mm, vma, vmend, 0);
if (err)
goto out;
- /* split_vma() invalidated the mas */
- mas_pause(&mas);
}
replace:
err = vma_replace_policy(vma, new_pol);
@@ -842,7 +833,7 @@ replace:
goto out;
next:
prev = vma;
- }
+ } for_each_vma_range(vmi, vma, end);
out:
return err;
_
Patches currently in -mm which might be from Liam.Howlett@xxxxxxxxxx are
maple_tree-add-mas_init-function.patch
maple_tree-fix-potential-rcu-issue.patch
maple_tree-reduce-user-error-potential.patch
test_maple_tree-test-modifications-while-iterating.patch
mm-expand-vma-iterator-interface.patch
mm-mmap-convert-brk-to-use-vma-iterator.patch
kernel-fork-convert-forking-to-using-the-vmi-iterator.patch
mmap-convert-vma_link-vma-iterator.patch
mm-mmap-remove-preallocation-from-do_mas_align_munmap.patch
mmap-change-do_mas_munmap-and-do_mas_aligned_munmap-to-use-vma-iterator.patch
mmap-convert-vma_expand-to-use-vma-iterator.patch
mm-add-temporary-vma-iterator-versions-of-vma_merge-split_vma-and-__split_vma.patch
ipc-shm-use-the-vma-iterator-for-munmap-calls.patch
userfaultfd-use-vma-iterator.patch
mm-change-mprotect_fixup-to-vma-iterator.patch
mlock-convert-mlock-to-vma-iterator.patch
coredump-convert-to-vma-iterator.patch
mempolicy-convert-to-vma-iterator.patch
task_mmu-convert-to-vma-iterator.patch
sched-convert-to-vma-iterator.patch
madvise-use-vmi-iterator-for-__split_vma-and-vma_merge.patch
mmap-pass-through-vmi-iterator-to-__split_vma.patch
mmap-use-vmi-version-of-vma_merge.patch
mm-mremap-use-vmi-version-of-vma_merge.patch
mm-switch-vma_merge-split_vma-and-__split_vma-to-vma-iterator.patch
mmap-convert-__vma_adjust-to-use-vma-iterator.patch
mm-pass-through-vma-iterator-to-__vma_adjust.patch
madvise-use-split_vma-instead-of-__split_vma.patch
mm-remove-unnecessary-write-to-vma-iterator-in-__vma_adjust.patch
mm-pass-vma-iterator-through-to-__vma_adjust.patch
mm-add-vma-iterator-to-vma_adjust-arguments.patch
mmap-clean-up-mmap_region-unrolling.patch
mm-change-munmap-splitting-order-and-move_vma.patch
mm-mmap-move-anon_vma-setting-in-__vma_adjust.patch
mm-mmap-refactor-locking-out-of-__vma_adjust.patch
mm-mmap-use-vma_prepare-and-vma_complete-in-vma_expand.patch
mm-mmap-introduce-init_vma_prep-and-init_multi_vma_prep.patch
mm-dont-use-__vma_adjust-in-__split_vma.patch
mm-mmap-dont-use-__vma_adjust-in-shift_arg_pages.patch
mm-mmap-introduce-dup_vma_anon-helper.patch
mm-mmap-convert-do_brk_flags-to-use-vma_prepare-and-vma_complete.patch
mm-mmap-remove-__vma_adjust.patch
vma_merge-set-vma-iterator-to-correct-position.patch
