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mm/vma: add limits to unmap_region() for vmas

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Add a limit to the vma search instead of using the start and end of the
one passed in.

No functional changes intended.

Link: https://lkml.kernel.org/r/20260121164946.2093480-5-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.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 11:49:39 -05:00
committed by Andrew Morton
parent d6d13e2ad8
commit 23bd03a9a2
2 changed files with 5 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
mm/vma.c
View File

@@ -473,6 +473,7 @@ void remove_vma(struct vm_area_struct *vma)
* Called with the mm semaphore held. * Called with the mm semaphore held.
*/ */
void unmap_region(struct ma_state *mas, struct vm_area_struct *vma, void unmap_region(struct ma_state *mas, struct vm_area_struct *vma,
unsigned long vma_start, unsigned long vma_end,
struct vm_area_struct *prev, struct vm_area_struct *next) struct vm_area_struct *prev, struct vm_area_struct *next)
{ {
struct mm_struct *mm = vma->vm_mm; struct mm_struct *mm = vma->vm_mm;
@@ -480,7 +481,7 @@ void unmap_region(struct ma_state *mas, struct vm_area_struct *vma,
tlb_gather_mmu(&tlb, mm); tlb_gather_mmu(&tlb, mm);
update_hiwater_rss(mm); update_hiwater_rss(mm);
unmap_vmas(&tlb, mas, vma, vma->vm_start, vma->vm_end, vma->vm_end); unmap_vmas(&tlb, mas, vma, vma_start, vma_end, vma_end);
mas_set(mas, vma->vm_end); mas_set(mas, vma->vm_end);
free_pgtables(&tlb, mas, vma, prev ? prev->vm_end : FIRST_USER_ADDRESS, free_pgtables(&tlb, mas, vma, prev ? prev->vm_end : FIRST_USER_ADDRESS,
next ? next->vm_start : USER_PGTABLES_CEILING, next ? next->vm_start : USER_PGTABLES_CEILING,
@@ -2466,7 +2467,8 @@ static int __mmap_new_file_vma(struct mmap_state *map,
vma_iter_set(vmi, vma->vm_end); vma_iter_set(vmi, vma->vm_end);
/* Undo any partial mapping done by a device driver. */ /* Undo any partial mapping done by a device driver. */
unmap_region(&vmi->mas, vma, map->prev, map->next); unmap_region(&vmi->mas, vma, vma->vm_start, vma->vm_end,
map->prev, map->next);
return error; return error;
} }

1
mm/vma.h
View File

@@ -264,6 +264,7 @@ int do_vmi_munmap(struct vma_iterator *vmi, struct mm_struct *mm,
void remove_vma(struct vm_area_struct *vma); void remove_vma(struct vm_area_struct *vma);
void unmap_region(struct ma_state *mas, struct vm_area_struct *vma, void unmap_region(struct ma_state *mas, struct vm_area_struct *vma,
unsigned long vma_start, unsigned long vma_end,
struct vm_area_struct *prev, struct vm_area_struct *next); struct vm_area_struct *prev, struct vm_area_struct *next);
/** /**