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mm/mmap: abstract vma clean up from exit_mmap()

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Create the new function tear_down_vmas() to remove a range of vmas. 
exit_mmap() will be removing all the vmas.

This is necessary for future patches.

No functional changes intended.

Link: https://lkml.kernel.org/r/20260121164946.2093480-4-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Pedro Falcato <pfalcato@suse.de>
Reviewed-by: Suren Baghdasaryan <surenb@google.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Chris Li <chrisl@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jann Horn <jannh@google.com>
Cc: Kairui Song <kasong@tencent.com>
Cc: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: SeongJae Park <sj@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Liam R. Howlett 2026-01-21 11:49:38 -05:00 committed by Andrew Morton
parent 95725acc3c
commit d6d13e2ad8
1 changed files with 24 additions and 13 deletions
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37
mm/mmap.c
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@ -1247,6 +1247,29 @@ int vm_brk_flags(unsigned long addr, unsigned long request, vm_flags_t vm_flags)
}
EXPORT_SYMBOL(vm_brk_flags);
static
unsigned long tear_down_vmas(struct mm_struct *mm, struct vma_iterator *vmi,
struct vm_area_struct *vma, unsigned long end)
{
unsigned long nr_accounted = 0;
int count = 0;
mmap_assert_write_locked(mm);
vma_iter_set(vmi, vma->vm_end);
do {
if (vma->vm_flags & VM_ACCOUNT)
nr_accounted += vma_pages(vma);
vma_mark_detached(vma);
remove_vma(vma);
count++;
cond_resched();
vma = vma_next(vmi);
} while (vma && vma->vm_end <= end);
VM_WARN_ON_ONCE(count != mm->map_count);
return nr_accounted;
}
/* Release all mmaps. */
void exit_mmap(struct mm_struct *mm)
{
@ -1254,7 +1277,6 @@ void exit_mmap(struct mm_struct *mm)
struct vm_area_struct *vma;
unsigned long nr_accounted = 0;
VMA_ITERATOR(vmi, mm, 0);
int count = 0;
/* mm's last user has gone, and its about to be pulled down */
mmu_notifier_release(mm);
@ -1294,18 +1316,7 @@ void exit_mmap(struct mm_struct *mm)
* enabled, without holding any MM locks besides the unreachable
* mmap_write_lock.
*/
vma_iter_set(&vmi, vma->vm_end);
do {
if (vma->vm_flags & VM_ACCOUNT)
nr_accounted += vma_pages(vma);
vma_mark_detached(vma);
remove_vma(vma);
count++;
cond_resched();
vma = vma_next(&vmi);
} while (vma && likely(!xa_is_zero(vma)));
BUG_ON(count != mm->map_count);
nr_accounted = tear_down_vmas(mm, &vmi, vma, ULONG_MAX);
destroy:
__mt_destroy(&mm->mm_mt);