mm: introduce vma_pgtable_walk_{begin|end}()
Introduce per-vma begin()/end() helpers for pgtable walks. This is a preparation work to merge hugetlb pgtable walkers with generic mm. The helpers need to be called before and after a pgtable walk, will start to be needed if the pgtable walker code supports hugetlb pages. It's a hook point for any type of VMA, but for now only hugetlb uses it to stablize the pgtable pages from getting away (due to possible pmd unsharing). Link: https://lkml.kernel.org/r/20240327152332.950956-5-peterx@redhat.com Signed-off-by: Peter Xu <peterx@redhat.com> Reviewed-by: Christoph Hellwig <hch@infradead.org> Reviewed-by: Muchun Song <muchun.song@linux.dev> Tested-by: Ryan Roberts <ryan.roberts@arm.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Andrew Jones <andrew.jones@linux.dev> Cc: Aneesh Kumar K.V (IBM) <aneesh.kumar@kernel.org> Cc: Axel Rasmussen <axelrasmussen@google.com> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: David Hildenbrand <david@redhat.com> Cc: James Houghton <jthoughton@google.com> Cc: Jason Gunthorpe <jgg@nvidia.com> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Kirill A. Shutemov <kirill@shutemov.name> Cc: Lorenzo Stoakes <lstoakes@gmail.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: "Mike Rapoport (IBM)" <rppt@kernel.org> Cc: Rik van Riel <riel@surriel.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Yang Shi <shy828301@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -4230,4 +4230,7 @@ static inline bool pfn_is_unaccepted_memory(unsigned long pfn)
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return range_contains_unaccepted_memory(paddr, paddr + PAGE_SIZE);
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}
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void vma_pgtable_walk_begin(struct vm_area_struct *vma);
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void vma_pgtable_walk_end(struct vm_area_struct *vma);
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#endif /* _LINUX_MM_H */
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mm/memory.c
12
mm/memory.c
@ -6378,3 +6378,15 @@ void ptlock_free(struct ptdesc *ptdesc)
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kmem_cache_free(page_ptl_cachep, ptdesc->ptl);
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}
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#endif
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void vma_pgtable_walk_begin(struct vm_area_struct *vma)
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{
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if (is_vm_hugetlb_page(vma))
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hugetlb_vma_lock_read(vma);
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}
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void vma_pgtable_walk_end(struct vm_area_struct *vma)
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{
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if (is_vm_hugetlb_page(vma))
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hugetlb_vma_unlock_read(vma);
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}
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