linux-kernel - [PATCH v2 05/10] mm/vma: Add page table limit to unmap

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Message-ID: <20260115182720.1691130-6-Liam.Howlett@oracle.com>
Date: Thu, 15 Jan 2026 13:27:15 -0500
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Suren Baghdasaryan <surenb@...gle.com>,
        Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
        Pedro Falcato <pfalcato@...e.de>, David Hildenbrand <david@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>, Michal Hocko <mhocko@...e.com>,
        Jann Horn <jannh@...gle.com>, shikemeng@...weicloud.com,
        kasong@...cent.com, nphamcs@...il.com, bhe@...hat.com,
        baohua@...nel.org, chrisl@...nel.org,
        Matthew Wilcox <willy@...radead.org>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>
Subject: [PATCH v2 05/10] 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.

Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Reviewed-by: Pedro Falcato <pfalcato@...e.de>
Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 mm/vma.c | 7 ++++---
 mm/vma.h | 3 ++-
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/mm/vma.c b/mm/vma.c
index b2b9e7b3284f3..b92383e5eebd1 100644
--- a/mm/vma.c
+++ b/mm/vma.c
@@ -474,7 +474,8 @@ void remove_vma(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)
+		unsigned long pg_max, struct vm_area_struct *prev,
+		struct vm_area_struct *next)
 {
 	struct mm_struct *mm = vma->vm_mm;
 	struct mmu_gather tlb;
@@ -484,8 +485,7 @@ void unmap_region(struct ma_state *mas, struct vm_area_struct *vma,
 	unmap_vmas(&tlb, mas, vma, vma_start, vma_end, vma_end);
 	mas_set(mas, vma->vm_end);
 	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,
+		      pg_max, next ? next->vm_start : USER_PGTABLES_CEILING,
 		      /* mm_wr_locked = */ true);
 	tlb_finish_mmu(&tlb);
 }
@@ -2469,6 +2469,7 @@ static int __mmap_new_file_vma(struct mmap_state *map,
 		vma_iter_set(vmi, vma->vm_end);
 		/* Undo any partial mapping done by a device driver. */
 		unmap_region(&vmi->mas, vma, vma->vm_start, vma->vm_end,
+			     map->next ? map->next->vm_start : USER_PGTABLES_CEILING,
 			     map->prev, map->next);
 
 		return error;
diff --git a/mm/vma.h b/mm/vma.h
index e671adced3a03..7c2c95fef240b 100644
--- a/mm/vma.h
+++ b/mm/vma.h
@@ -265,7 +265,8 @@ void remove_vma(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);
+		unsigned long pg_max, struct vm_area_struct *prev,
+		struct vm_area_struct *next);
 
 /**
  * vma_modify_flags() - Perform any necessary split/merge in preparation for
-- 
2.47.3