[PATCH mm-unstable v5 02/10] mm/hugetlb: convert destroy_compound_gigantic_page() to folios

Sidhartha Kumar
2022-11-29T22:51:28Z

Convert page operations within __destroy_compound_gigantic_page() to the
corresponding folio operations.

Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
---
mm/hugetlb.c | 43 +++++++++++++++++++++----------------------
1 file changed, 21 insertions(+), 22 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 6390de8975c5..f6f791675c38 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1325,43 +1325,40 @@ static int hstate_next_node_to_free(struct hstate *h, nodemask_t *nodes_allowed)
nr_nodes--)

/* used to demote non-gigantic_huge pages as well */
-static void __destroy_compound_gigantic_page(struct page *page,
+static void __destroy_compound_gigantic_folio(struct folio *folio,
unsigned int order, bool demote)
{
int i;
int nr_pages = 1 << order;
struct page *p;

- atomic_set(compound_mapcount_ptr(page), 0);
- atomic_set(subpages_mapcount_ptr(page), 0);
- atomic_set(compound_pincount_ptr(page), 0);
+ atomic_set(folio_mapcount_ptr(folio), 0);
+ atomic_set(folio_subpages_mapcount_ptr(folio), 0);
+ atomic_set(folio_pincount_ptr(folio), 0);

for (i = 1; i < nr_pages; i++) {
- p = nth_page(page, i);
+ p = folio_page(folio, i);
p->mapping = NULL;
clear_compound_head(p);
if (!demote)
set_page_refcounted(p);
}

- set_compound_order(page, 0);
-#ifdef CONFIG_64BIT
- page[1].compound_nr = 0;
-#endif
- __ClearPageHead(page);
+ folio_set_compound_order(folio, 0);
+ __folio_clear_head(folio);
}

-static void destroy_compound_hugetlb_page_for_demote(struct page *page,
+static void destroy_compound_hugetlb_folio_for_demote(struct folio *folio,
unsigned int order)
{
- __destroy_compound_gigantic_page(page, order, true);
+ __destroy_compound_gigantic_folio(folio, order, true);
}

#ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE
-static void destroy_compound_gigantic_page(struct page *page,
+static void destroy_compound_gigantic_folio(struct folio *folio,
unsigned int order)
{
- __destroy_compound_gigantic_page(page, order, false);
+ __destroy_compound_gigantic_folio(folio, order, false);
}

static void free_gigantic_page(struct page *page, unsigned int order)
@@ -1430,7 +1427,7 @@ static struct page *alloc_gigantic_page(struct hstate *h, gfp_t gfp_mask,
return NULL;
}
static inline void free_gigantic_page(struct page *page, unsigned int order) { }
-static inline void destroy_compound_gigantic_page(struct page *page,
+static inline void destroy_compound_gigantic_folio(struct folio *folio,
unsigned int order) { }
#endif

@@ -1477,8 +1474,8 @@ static void __remove_hugetlb_page(struct hstate *h, struct page *page,
*
* For gigantic pages set the destructor to the null dtor. This
* destructor will never be called. Before freeing the gigantic
- * page destroy_compound_gigantic_page will turn the compound page
- * into a simple group of pages. After this the destructor does not
+ * page destroy_compound_gigantic_folio will turn the folio into a
+ * simple group of pages. After this the destructor does not
* apply.
*
* This handles the case where more than one ref is held when and
@@ -1559,6 +1556,7 @@ static void add_hugetlb_page(struct hstate *h, struct page *page,
static void __update_and_free_page(struct hstate *h, struct page *page)
{
int i;
+ struct folio *folio = page_folio(page);
struct page *subpage;

if (hstate_is_gigantic(h) && !gigantic_page_runtime_supported())
@@ -1587,8 +1585,8 @@ static void __update_and_free_page(struct hstate *h, struct page *page)
* Move PageHWPoison flag from head page to the raw error pages,
* which makes any healthy subpages reusable.
*/
- if (unlikely(PageHWPoison(page)))
- hugetlb_clear_page_hwpoison(page);
+ if (unlikely(folio_test_hwpoison(folio)))
+ hugetlb_clear_page_hwpoison(&folio->page);

for (i = 0; i < pages_per_huge_page(h); i++) {
subpage = nth_page(page, i);
@@ -1604,7 +1602,7 @@ static void __update_and_free_page(struct hstate *h, struct page *page)
*/
if (hstate_is_gigantic(h) ||
hugetlb_cma_page(page, huge_page_order(h))) {
- destroy_compound_gigantic_page(page, huge_page_order(h));
+ destroy_compound_gigantic_folio(folio, huge_page_order(h));
free_gigantic_page(page, huge_page_order(h));
} else {
__free_pages(page, huge_page_order(h));
@@ -3437,6 +3435,7 @@ static int demote_free_huge_page(struct hstate *h, struct page *page)
{
int i, nid = page_to_nid(page);
struct hstate *target_hstate;
+ struct folio *folio = page_folio(page);
struct page *subpage;
int rc = 0;

@@ -3455,10 +3454,10 @@ static int demote_free_huge_page(struct hstate *h, struct page *page)
}

/*
- * Use destroy_compound_hugetlb_page_for_demote for all huge page
+ * Use destroy_compound_hugetlb_folio_for_demote for all huge page
* sizes as it will not ref count pages.
*/
- destroy_compound_hugetlb_page_for_demote(page, huge_page_order(h));
+ destroy_compound_hugetlb_folio_for_demote(folio, huge_page_order(h));

/*
* Taking target hstate mutex synchronizes with set_max_huge_pages.
--
2.38.1