[PATCH v1 01/10] mm: Expose clear_huge_page() unconditionally

Ryan Roberts
2023-06-26T17:15:08Z

In preparation for extending vma_alloc_zeroed_movable_folio() to
allocate a arbitrary order folio, expose clear_huge_page()
unconditionally, so that it can be used to zero the allocated folio in
the generic implementation of vma_alloc_zeroed_movable_folio().

Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
---
include/linux/mm.h | 3 ++-
mm/memory.c | 2 +-
2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 7f1741bd870a..7e3bf45e6491 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3684,10 +3684,11 @@ enum mf_action_page_type {
*/
extern const struct attribute_group memory_failure_attr_group;

-#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
extern void clear_huge_page(struct page *page,
unsigned long addr_hint,
unsigned int pages_per_huge_page);
+
+#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
int copy_user_large_folio(struct folio *dst, struct folio *src,
unsigned long addr_hint,
struct vm_area_struct *vma);
diff --git a/mm/memory.c b/mm/memory.c
index fb30f7523550..3d4ea668c4d1 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -5741,7 +5741,6 @@ void __might_fault(const char *file, int line)
EXPORT_SYMBOL(__might_fault);
#endif

-#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
/*
* Process all subpages of the specified huge page with the specified
* operation. The target subpage will be processed last to keep its
@@ -5839,6 +5838,7 @@ void clear_huge_page(struct page *page,
process_huge_page(addr_hint, pages_per_huge_page, clear_subpage, page);
}

+#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS)
static int copy_user_gigantic_page(struct folio *dst, struct folio *src,
unsigned long addr,
struct vm_area_struct *vma,
--
2.25.1