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| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2023-01-11 14:28:57 +0000 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-02-02 22:32:57 -0800 |
| commit | c7f84b5723f1a60becd79d895ab214a7d5ee93c1 (patch) | |
| tree | c4d4144edba7db974408f8d1feeaa15c20c3f58b /include/linux/rmap.h | |
| parent | db4e5dbdcdd55482ab23bf4a0ae6746f93efb0d9 (diff) | |
| download | linux-c7f84b5723f1a60becd79d895ab214a7d5ee93c1.tar.gz linux-c7f84b5723f1a60becd79d895ab214a7d5ee93c1.tar.bz2 linux-c7f84b5723f1a60becd79d895ab214a7d5ee93c1.zip | |
mm: use entire_mapcount in __page_dup_rmap()
Remove the use of the compound_mapcount_ptr() wrapper, and add an
assertion that we're not passing a tail page if we're duplicating a PMD.
Link: https://lkml.kernel.org/r/20230111142915.1001531-12-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/linux/rmap.h')
| -rw-r--r-- | include/linux/rmap.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/include/linux/rmap.h b/include/linux/rmap.h index aa682a2a93ce..a6bd1f0a183d 100644 --- a/include/linux/rmap.h +++ b/include/linux/rmap.h @@ -208,7 +208,14 @@ void hugepage_add_new_anon_rmap(struct page *, struct vm_area_struct *, static inline void __page_dup_rmap(struct page *page, bool compound) { - atomic_inc(compound ? compound_mapcount_ptr(page) : &page->_mapcount); + if (compound) { + struct folio *folio = (struct folio *)page; + + VM_BUG_ON_PAGE(compound && !PageHead(page), page); + atomic_inc(&folio->_entire_mapcount); + } else { + atomic_inc(&page->_mapcount); + } } static inline void page_dup_file_rmap(struct page *page, bool compound) |