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Tue, 9 Sep 2025 19:10:12 +0000 Received: from PH0PR10MB5777.namprd10.prod.outlook.com ([fe80::75a8:21cc:f343:f68c]) by PH0PR10MB5777.namprd10.prod.outlook.com ([fe80::75a8:21cc:f343:f68c%5]) with mapi id 15.20.9094.021; Tue, 9 Sep 2025 19:10:12 +0000 From: "Liam R. Howlett" To: Andrew Morton Cc: maple-tree@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, David Hildenbrand , Lorenzo Stoakes , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Jann Horn , Pedro Falcato , Charan Teja Kalla , shikemeng@huaweicloud.com, kasong@tencent.com, nphamcs@gmail.com, bhe@redhat.com, baohua@kernel.org, chrisl@kernel.org, Matthew Wilcox , "Liam R. Howlett" Subject: [PATCH v1 9/9] mm: Use unmap_desc struct for freeing page tables. 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through the unmap_desc to free_pgtables() because it almost has everything necessary and is already on the stack. Updates testing code as necessary. No functional changes intended. Signed-off-by: Liam R. Howlett --- mm/internal.h | 5 +---- mm/memory.c | 21 ++++++++++----------- mm/mmap.c | 6 +++--- mm/vma.c | 7 ++----- tools/testing/vma/vma_internal.h | 11 ++--------- 5 files changed, 18 insertions(+), 32 deletions(-) diff --git a/mm/internal.h b/mm/internal.h index 1239944f2830a..f22329967e908 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -445,10 +445,7 @@ bool __folio_end_writeback(struct folio *folio); void deactivate_file_folio(struct folio *folio); void folio_activate(struct folio *folio); -void free_pgtables(struct mmu_gather *tlb, struct ma_state *mas, - struct vm_area_struct *start_vma, unsigned long floor, - unsigned long ceiling, unsigned long tree_max, - bool mm_wr_locked); +void free_pgtables(struct mmu_gather *tlb, struct unmap_desc *desc); void pmd_install(struct mm_struct *mm, pmd_t *pmd, pgtable_t *pte); diff --git a/mm/memory.c b/mm/memory.c index 8d4d976311037..98c5ffd28a109 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -387,15 +387,14 @@ void free_pgd_range(struct mmu_gather *tlb, * The tree_max differs from the ceiling when a dup_mmap() failed and the tree * has unrelated data to the mm_struct being torn down. */ -void free_pgtables(struct mmu_gather *tlb, struct ma_state *mas, - struct vm_area_struct *vma, unsigned long floor, - unsigned long ceiling, unsigned long tree_max, - bool mm_wr_locked) +void free_pgtables(struct mmu_gather *tlb, struct unmap_desc *desc) { struct unlink_vma_file_batch vb; + struct ma_state *mas = desc->mas; + struct vm_area_struct *vma = desc->first; /* underflow can happen and is fine */ - WARN_ON_ONCE(tree_max - 1 > ceiling - 1); + WARN_ON_ONCE(desc->tree_max - 1 > desc->last_pgaddr - 1); tlb_free_vmas(tlb); @@ -407,13 +406,13 @@ void free_pgtables(struct mmu_gather *tlb, struct ma_state *mas, * Note: USER_PGTABLES_CEILING may be passed as ceiling and may * be 0. This will underflow and is okay. */ - next = mas_find(mas, tree_max - 1); + next = mas_find(mas, desc->tree_max - 1); /* * Hide vma from rmap and truncate_pagecache before freeing * pgtables */ - if (mm_wr_locked) + if (desc->mm_wr_locked) vma_start_write(vma); unlink_anon_vmas(vma); @@ -425,16 +424,16 @@ void free_pgtables(struct mmu_gather *tlb, struct ma_state *mas, */ while (next && next->vm_start <= vma->vm_end + PMD_SIZE) { vma = next; - next = mas_find(mas, tree_max - 1); - if (mm_wr_locked) + next = mas_find(mas, desc->tree_max - 1); + if (desc->mm_wr_locked) vma_start_write(vma); unlink_anon_vmas(vma); unlink_file_vma_batch_add(&vb, vma); } unlink_file_vma_batch_final(&vb); - free_pgd_range(tlb, addr, vma->vm_end, - floor, next ? next->vm_start : ceiling); + free_pgd_range(tlb, addr, vma->vm_end, desc->first_pgaddr, + next ? next->vm_start : desc->last_pgaddr); vma = next; } while (vma); } diff --git a/mm/mmap.c b/mm/mmap.c index 6011f62b0a294..9908481452780 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1311,10 +1311,10 @@ void exit_mmap(struct mm_struct *mm) */ mm_flags_set(MMF_OOM_SKIP, mm); mmap_write_lock(mm); + unmap.mm_wr_locked = true; mt_clear_in_rcu(&mm->mm_mt); - vma_iter_set(&vmi, vma->vm_end); - free_pgtables(&tlb, &vmi.mas, vma, FIRST_USER_ADDRESS, - USER_PGTABLES_CEILING, USER_PGTABLES_CEILING, true); + vma_iter_set(&vmi, unmap.tree_reset); + free_pgtables(&tlb, &unmap); tlb_finish_mmu(&tlb); /* diff --git a/mm/vma.c b/mm/vma.c index ad64cd9795ef3..ba155a539d160 100644 --- a/mm/vma.c +++ b/mm/vma.c @@ -476,16 +476,13 @@ void remove_vma(struct vm_area_struct *vma) void unmap_region(struct unmap_desc *desc) { struct mm_struct *mm = desc->first->vm_mm; - struct ma_state *mas = desc->mas; struct mmu_gather tlb; tlb_gather_mmu(&tlb, mm); update_hiwater_rss(mm); unmap_vmas(&tlb, desc); - mas_set(mas, desc->tree_reset); - free_pgtables(&tlb, mas, desc->first, desc->first_pgaddr, - desc->last_pgaddr, desc->tree_max, - desc->mm_wr_locked); + mas_set(desc->mas, desc->tree_reset); + free_pgtables(&tlb, desc); tlb_finish_mmu(&tlb); } diff --git a/tools/testing/vma/vma_internal.h b/tools/testing/vma/vma_internal.h index d73ad4747d40a..435c5a24480bc 100644 --- a/tools/testing/vma/vma_internal.h +++ b/tools/testing/vma/vma_internal.h @@ -892,17 +892,10 @@ static inline void unmap_vmas(struct mmu_gather *tlb, struct unmap_desc *unmap) (void)unmap; } -static inline void free_pgtables(struct mmu_gather *tlb, struct ma_state *mas, - struct vm_area_struct *vma, unsigned long floor, - unsigned long ceiling, unsigned long tree_max, - bool mm_wr_locked) +static inline void free_pgtables(struct mmu_gather *tlb, struct unmap_desc *desc) { (void)tlb; - (void)mas; - (void)vma; - (void)floor; - (void)ceiling; - (void)mm_wr_locked; + (void)desc; } static inline void mapping_unmap_writable(struct address_space *) -- 2.47.2