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mm/vma: add page table limit to unmap_region()

The unmap_region() calls need to pass through the page table limit for a
future patch.

No functional changes intended.

Link: https://lkml.kernel.org/r/20260121164946.2093480-7-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: Pedro Falcato <pfalcato@suse.de>
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: David Hildenbrand <david@redhat.com>
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: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

authored by

Liam R. Howlett and committed by
Andrew Morton 243de0c0 eda8c5e7

+6 -4
+4 -3
mm/vma.c
··· 474 474 */ 475 475 void unmap_region(struct ma_state *mas, struct vm_area_struct *vma, 476 476 unsigned long vma_start, unsigned long vma_end, 477 - struct vm_area_struct *prev, struct vm_area_struct *next) 477 + unsigned long pg_max, struct vm_area_struct *prev, 478 + struct vm_area_struct *next) 478 479 { 479 480 struct mm_struct *mm = vma->vm_mm; 480 481 struct mmu_gather tlb; ··· 485 484 unmap_vmas(&tlb, mas, vma, vma_start, vma_end, vma_end); 486 485 mas_set(mas, vma->vm_end); 487 486 free_pgtables(&tlb, mas, vma, prev ? prev->vm_end : FIRST_USER_ADDRESS, 488 - next ? next->vm_start : USER_PGTABLES_CEILING, 489 - next ? next->vm_start : USER_PGTABLES_CEILING, 487 + pg_max, next ? next->vm_start : USER_PGTABLES_CEILING, 490 488 /* mm_wr_locked = */ true); 491 489 tlb_finish_mmu(&tlb); 492 490 } ··· 2469 2469 vma_iter_set(vmi, vma->vm_end); 2470 2470 /* Undo any partial mapping done by a device driver. */ 2471 2471 unmap_region(&vmi->mas, vma, vma->vm_start, vma->vm_end, 2472 + map->next ? map->next->vm_start : USER_PGTABLES_CEILING, 2472 2473 map->prev, map->next); 2473 2474 2474 2475 return error;
+2 -1
mm/vma.h
··· 265 265 266 266 void unmap_region(struct ma_state *mas, struct vm_area_struct *vma, 267 267 unsigned long vma_start, unsigned long vma_end, 268 - struct vm_area_struct *prev, struct vm_area_struct *next); 268 + unsigned long pg_max, struct vm_area_struct *prev, 269 + struct vm_area_struct *next); 269 270 270 271 /** 271 272 * vma_modify_flags() - Perform any necessary split/merge in preparation for