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mm: use a folio in fault_dirty_shared_page()
We can replace four implicit calls to compound_head() with one by using folio. Link: https://lkml.kernel.org/r/20230701032853.258697-2-zhangpeng362@huawei.com Signed-off-by: ZhangPeng <zhangpeng362@huawei.com> Reviewed-by: Sidhartha Kumar <sidhartha.kumar@oracle.com> Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Kefeng Wang <wangkefeng.wang@huawei.com> Cc: Nanyong Sun <sunnanyong@huawei.com> Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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mm/memory.c
16
mm/memory.c
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@ -2965,20 +2965,20 @@ static vm_fault_t fault_dirty_shared_page(struct vm_fault *vmf)
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{
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struct vm_area_struct *vma = vmf->vma;
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struct address_space *mapping;
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struct page *page = vmf->page;
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struct folio *folio = page_folio(vmf->page);
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bool dirtied;
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bool page_mkwrite = vma->vm_ops && vma->vm_ops->page_mkwrite;
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dirtied = set_page_dirty(page);
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VM_BUG_ON_PAGE(PageAnon(page), page);
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dirtied = folio_mark_dirty(folio);
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VM_BUG_ON_FOLIO(folio_test_anon(folio), folio);
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/*
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* Take a local copy of the address_space - page.mapping may be zeroed
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* by truncate after unlock_page(). The address_space itself remains
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* pinned by vma->vm_file's reference. We rely on unlock_page()'s
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* Take a local copy of the address_space - folio.mapping may be zeroed
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* by truncate after folio_unlock(). The address_space itself remains
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* pinned by vma->vm_file's reference. We rely on folio_unlock()'s
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* release semantics to prevent the compiler from undoing this copying.
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*/
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mapping = page_rmapping(page);
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unlock_page(page);
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mapping = folio_raw_mapping(folio);
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folio_unlock(folio);
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if (!page_mkwrite)
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file_update_time(vma->vm_file);
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