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mm: convert head_subpages_mapcount() into folio_nr_pages_mapped()

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Calling this 'mapcount' is confusing since mapcount is usually the number
of times something is mapped; instead this is the number of mapped pages. 
It's also better to enforce that this is a folio rather than a head page.

Move folio_nr_pages_mapped() into mm/internal.h since this is not
something we want device drivers or filesystems poking at.  Get rid of
folio_subpages_mapcount_ptr() and use folio->_nr_pages_mapped directly.

Link: https://lkml.kernel.org/r/20230111142915.1001531-3-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 14:28:48 +00:00
committed by Andrew Morton
parent 94688e8eb4
commit eec20426d4
6 changed files with 32 additions and 37 deletions
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4
mm/debug.c
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@@ -94,10 +94,10 @@ static void __dump_page(struct page *page)
page, page_ref_count(head), mapcount, mapping,
page_to_pgoff(page), page_to_pfn(page));
if (compound) {
pr_warn("head:%p order:%u compound_mapcount:%d subpages_mapcount:%d pincount:%d\n",
pr_warn("head:%p order:%u compound_mapcount:%d nr_pages_mapped:%d pincount:%d\n",
head, compound_order(head),
head_compound_mapcount(head),
head_subpages_mapcount(head),
folio_nr_pages_mapped(folio),
atomic_read(&folio->_pincount));
}