The patch titled
Subject: mm/mmap: move vma_prepare before vma_adjust_trans_huge
has been added to the -mm mm-unstable branch. Its filename is
mm-mmap-move-vma_prepare-before-vma_adjust_trans_huge.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-mmap-move-vma_prepare-before-vma_adjust_trans_huge.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: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Subject: mm/mmap: move vma_prepare before vma_adjust_trans_huge
Date: Mon, 27 Feb 2023 09:36:13 -0800
vma_prepare() acquires all locks required before VMA modifications. Move
vma_prepare() before vma_adjust_trans_huge() so that VMA is locked before
any modification.
Link: https://lkml.kernel.org/r/20230227173632.3292573-15-surenb@xxxxxxxxxx
Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/mm/mmap.c~mm-mmap-move-vma_prepare-before-vma_adjust_trans_huge
+++ a/mm/mmap.c
@@ -683,12 +683,12 @@ int vma_expand(struct vma_iterator *vmi,
if (vma_iter_prealloc(vmi))
goto nomem;
+ vma_prepare(&vp);
vma_adjust_trans_huge(vma, start, end, 0);
/* VMA iterator points to previous, so set to start if necessary */
if (vma_iter_addr(vmi) != start)
vma_iter_set(vmi, start);
- vma_prepare(&vp);
vma->vm_start = start;
vma->vm_end = end;
vma->vm_pgoff = pgoff;
@@ -723,8 +723,8 @@ int vma_shrink(struct vma_iterator *vmi,
return -ENOMEM;
init_vma_prep(&vp, vma);
- vma_adjust_trans_huge(vma, start, end, 0);
vma_prepare(&vp);
+ vma_adjust_trans_huge(vma, start, end, 0);
if (vma->vm_start < start)
vma_iter_clear(vmi, vma->vm_start, start);
@@ -994,12 +994,12 @@ struct vm_area_struct *vma_merge(struct
if (vma_iter_prealloc(vmi))
return NULL;
- vma_adjust_trans_huge(vma, vma_start, vma_end, adj_next);
init_multi_vma_prep(&vp, vma, adjust, remove, remove2);
VM_WARN_ON(vp.anon_vma && adjust && adjust->anon_vma &&
vp.anon_vma != adjust->anon_vma);
vma_prepare(&vp);
+ vma_adjust_trans_huge(vma, vma_start, vma_end, adj_next);
if (vma_start < vma->vm_start || vma_end > vma->vm_end)
vma_expanded = true;
@@ -2198,10 +2198,10 @@ int __split_vma(struct vma_iterator *vmi
if (new->vm_ops && new->vm_ops->open)
new->vm_ops->open(new);
- vma_adjust_trans_huge(vma, vma->vm_start, addr, 0);
init_vma_prep(&vp, vma);
vp.insert = new;
vma_prepare(&vp);
+ vma_adjust_trans_huge(vma, vma->vm_start, addr, 0);
if (new_below) {
vma->vm_start = addr;
@@ -2910,9 +2910,9 @@ static int do_brk_flags(struct vma_itera
if (vma_iter_prealloc(vmi))
goto unacct_fail;
- vma_adjust_trans_huge(vma, vma->vm_start, addr + len, 0);
init_vma_prep(&vp, vma);
vma_prepare(&vp);
+ vma_adjust_trans_huge(vma, vma->vm_start, addr + len, 0);
vma->vm_end = addr + len;
vm_flags_set(vma, VM_SOFTDIRTY);
vma_iter_store(vmi, vma);
_
Patches currently in -mm which might be from surenb@xxxxxxxxxx are
mm-introduce-config_per_vma_lock.patch
mm-move-mmap_lock-assert-function-definitions.patch
mm-add-per-vma-lock-and-helper-functions-to-control-it.patch
mm-mark-vma-as-being-written-when-changing-vm_flags.patch
mm-mmap-move-vma_prepare-before-vma_adjust_trans_huge.patch
mm-khugepaged-write-lock-vma-while-collapsing-a-huge-page.patch
mm-mmap-write-lock-vmas-in-vma_prepare-before-modifying-them.patch
mm-mremap-write-lock-vma-while-remapping-it-to-a-new-address-range.patch
mm-write-lock-vmas-before-removing-them-from-vma-tree.patch
mm-conditionally-write-lock-vma-in-free_pgtables.patch
kernel-fork-assert-no-vma-readers-during-its-destruction.patch
mm-mmap-prevent-pagefault-handler-from-racing-with-mmu_notifier-registration.patch
mm-introduce-vma-detached-flag.patch
mm-introduce-lock_vma_under_rcu-to-be-used-from-arch-specific-code.patch
mm-fall-back-to-mmap_lock-if-vma-anon_vma-is-not-yet-set.patch
mm-add-fault_flag_vma_lock-flag.patch
mm-prevent-do_swap_page-from-handling-page-faults-under-vma-lock.patch
mm-prevent-userfaults-to-be-handled-under-per-vma-lock.patch
mm-introduce-per-vma-lock-statistics.patch
x86-mm-try-vma-lock-based-page-fault-handling-first.patch
arm64-mm-try-vma-lock-based-page-fault-handling-first.patch
mm-mmap-free-vm_area_struct-without-call_rcu-in-exit_mmap.patch
mm-separate-vma-lock-from-vm_area_struct.patch
per-vma-locks.patch
