All users are gone, let's remove it.
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
---
include/linux/mm.h | 5 -----
mm/huge_memory.c | 48 ----------------------------------------------
2 files changed, 53 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 213cc569b192..a12291cfe5dd 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -820,16 +820,11 @@ static inline int page_mapcount(struct page *page)
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
int total_mapcount(struct page *page);
-int page_trans_huge_mapcount(struct page *page);
#else
static inline int total_mapcount(struct page *page)
{
return page_mapcount(page);
}
-static inline int page_trans_huge_mapcount(struct page *page)
-{
- return page_mapcount(page);
-}
#endif
static inline struct page *virt_to_head_page(const void *x)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index f34ebc5cb827..a6dc5af1a763 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2523,54 +2523,6 @@ int total_mapcount(struct page *page)
return ret;
}
-/*
- * This calculates accurately how many mappings a transparent hugepage
- * has (unlike page_mapcount() which isn't fully accurate). This full
- * accuracy is primarily needed to know if copy-on-write faults can
- * reuse the page and change the mapping to read-write instead of
- * copying them. At the same time this returns the total_mapcount too.
- *
- * The function returns the highest mapcount any one of the subpages
- * has. If the return value is one, even if different processes are
- * mapping different subpages of the transparent hugepage, they can
- * all reuse it, because each process is reusing a different subpage.
- *
- * The total_mapcount is instead counting all virtual mappings of the
- * subpages. If the total_mapcount is equal to "one", it tells the
- * caller all mappings belong to the same "mm" and in turn the
- * anon_vma of the transparent hugepage can become the vma->anon_vma
- * local one as no other process may be mapping any of the subpages.
- *
- * It would be more accurate to replace page_mapcount() with
- * page_trans_huge_mapcount(), however we only use
- * page_trans_huge_mapcount() in the copy-on-write faults where we
- * need full accuracy to avoid breaking page pinning, because
- * page_trans_huge_mapcount() is slower than page_mapcount().
- */
-int page_trans_huge_mapcount(struct page *page)
-{
- int i, ret;
-
- /* hugetlbfs shouldn't call it */
- VM_BUG_ON_PAGE(PageHuge(page), page);
-
- if (likely(!PageTransCompound(page)))
- return atomic_read(&page->_mapcount) + 1;
-
- page = compound_head(page);
-
- ret = 0;
- for (i = 0; i < thp_nr_pages(page); i++) {
- int mapcount = atomic_read(&page[i]._mapcount) + 1;
- ret = max(ret, mapcount);
- }
-
- if (PageDoubleMap(page))
- ret -= 1;
-
- return ret + compound_mapcount(page);
-}
-
/* Racy check whether the huge page can be split */
bool can_split_huge_page(struct page *page, int *pextra_pins)
{
--
2.34.1
