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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>
This commit is contained in:
ZhangPeng 2023-07-01 11:28:52 +08:00 committed by Andrew Morton
parent c70699e555
commit 15b4919a1e
1 changed files with 8 additions and 8 deletions
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16
mm/memory.c
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@ -2965,20 +2965,20 @@ static vm_fault_t fault_dirty_shared_page(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
struct address_space *mapping;
struct page *page = vmf->page;
struct folio *folio = page_folio(vmf->page);
bool dirtied;
bool page_mkwrite = vma->vm_ops && vma->vm_ops->page_mkwrite;
dirtied = set_page_dirty(page);
VM_BUG_ON_PAGE(PageAnon(page), page);
dirtied = folio_mark_dirty(folio);
VM_BUG_ON_FOLIO(folio_test_anon(folio), folio);
/*
* Take a local copy of the address_space - page.mapping may be zeroed
* by truncate after unlock_page(). The address_space itself remains
* pinned by vma->vm_file's reference. We rely on unlock_page()'s
* Take a local copy of the address_space - folio.mapping may be zeroed
* by truncate after folio_unlock(). The address_space itself remains
* pinned by vma->vm_file's reference. We rely on folio_unlock()'s
* release semantics to prevent the compiler from undoing this copying.
*/
mapping = page_rmapping(page);
unlock_page(page);
mapping = folio_raw_mapping(folio);
folio_unlock(folio);
if (!page_mkwrite)
file_update_time(vma->vm_file);