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mm: use entire_mapcount in __page_dup_rmap()

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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>
This commit is contained in:
Matthew Wilcox (Oracle) 2023-01-11 14:28:57 +00:00 committed by Andrew Morton
parent db4e5dbdcd
commit c7f84b5723
1 changed files with 8 additions and 1 deletions
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9
include/linux/rmap.h
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@ -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)