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authorMatthew Wilcox (Oracle) <willy@infradead.org>2021-04-12 23:45:17 +0300
committerMatthew Wilcox (Oracle) <willy@infradead.org>2021-09-27 16:27:31 +0300
commitdd10ab049beb479dc83bb14a7b5cd68c363983ce (patch)
tree954b257996e8d30144667ee4a15f97d1c0a34dad /mm/util.c
parent6abbaa5b01730a1f0883d199cf5a90ae5c5dccea (diff)
downloadlinux-dd10ab049beb479dc83bb14a7b5cd68c363983ce.tar.xz
mm: Add folio_mapped()
This function is the equivalent of page_mapped(). It is slightly shorter as we do not need to handle the PageTail() case. Reimplement page_mapped() as a wrapper around folio_mapped(). folio_mapped() is 13 bytes smaller than page_mapped(), but the page_mapped() wrapper is 30 bytes, for a net increase of 17 bytes of text. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Acked-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: William Kucharski <william.kucharski@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: David Howells <dhowells@redhat.com> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Diffstat (limited to 'mm/util.c')
-rw-r--r--mm/util.c29
1 files changed, 16 insertions, 13 deletions
diff --git a/mm/util.c b/mm/util.c
index 6c1fe9bee30a..e322a42090e5 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -671,28 +671,31 @@ void *page_rmapping(struct page *page)
return __page_rmapping(page);
}
-/*
- * Return true if this page is mapped into pagetables.
- * For compound page it returns true if any subpage of compound page is mapped.
+/**
+ * folio_mapped - Is this folio mapped into userspace?
+ * @folio: The folio.
+ *
+ * Return: True if any page in this folio is referenced by user page tables.
*/
-bool page_mapped(struct page *page)
+bool folio_mapped(struct folio *folio)
{
- int i;
+ long i, nr;
- if (likely(!PageCompound(page)))
- return atomic_read(&page->_mapcount) >= 0;
- page = compound_head(page);
- if (atomic_read(compound_mapcount_ptr(page)) >= 0)
+ if (folio_test_single(folio))
+ return atomic_read(&folio->_mapcount) >= 0;
+ if (atomic_read(folio_mapcount_ptr(folio)) >= 0)
return true;
- if (PageHuge(page))
+ if (folio_test_hugetlb(folio))
return false;
- for (i = 0; i < compound_nr(page); i++) {
- if (atomic_read(&page[i]._mapcount) >= 0)
+
+ nr = folio_nr_pages(folio);
+ for (i = 0; i < nr; i++) {
+ if (atomic_read(&folio_page(folio, i)->_mapcount) >= 0)
return true;
}
return false;
}
-EXPORT_SYMBOL(page_mapped);
+EXPORT_SYMBOL(folio_mapped);
struct anon_vma *page_anon_vma(struct page *page)
{