[v2,06/15] mm/rmap: remove do_page_add_anon_rmap()

Commit Message

David Hildenbrand March 15, 2022, 10:47 a.m. UTC

... and instead convert page_add_anon_rmap() to accept flags.

Passing flags instead of bools is usually nicer either way, and we want
to more often also pass RMAP_EXCLUSIVE in follow up patches when
detecting that an anonymous page is exclusive: for example, when
restoring an anonymous page from a writable migration entry.

This is a preparation for marking an anonymous page inside
page_add_anon_rmap() as exclusive when RMAP_EXCLUSIVE is passed.

Signed-off-by: David Hildenbrand <[e-mail]>
---
 include/linux/rmap.h |  4 +---
 mm/huge_memory.c     |  2 +-
 mm/ksm.c             |  2 +-
 mm/memory.c          |  2 +-
 mm/migrate.c         |  3 ++-
 mm/rmap.c            | 14 +-------------
 mm/swapfile.c        |  2 +-
 7 files changed, 8 insertions(+), 21 deletions(-)

Patch

diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index 49f6b208938c..a269f80fbeef 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -181,9 +181,7 @@  typedef int __bitwise rmap_t;
  */
 void page_move_anon_rmap(struct page *, struct vm_area_struct *);
 void page_add_anon_rmap(struct page *, struct vm_area_struct *,
-		unsigned long, bool);
-void do_page_add_anon_rmap(struct page *, struct vm_area_struct *,
-			   unsigned long, rmap_t);
+		unsigned long, rmap_t);
 void page_add_new_anon_rmap(struct page *, struct vm_area_struct *,
 		unsigned long, bool);
 void page_add_file_rmap(struct page *, bool);
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index c126d728b8de..2ca137e01e84 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -3115,7 +3115,7 @@  void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, struct page *new)
 
 	flush_cache_range(vma, mmun_start, mmun_start + HPAGE_PMD_SIZE);
 	if (PageAnon(new))
-		page_add_anon_rmap(new, vma, mmun_start, true);
+		page_add_anon_rmap(new, vma, mmun_start, RMAP_COMPOUND);
 	else
 		page_add_file_rmap(new, true);
 	set_pmd_at(mm, mmun_start, pvmw->pmd, pmde);
diff --git a/mm/ksm.c b/mm/ksm.c
index c20bd4d9a0d9..9ff28097bc0a 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -1153,7 +1153,7 @@  static int replace_page(struct vm_area_struct *vma, struct page *page,
 	 */
 	if (!is_zero_pfn(page_to_pfn(kpage))) {
 		get_page(kpage);
-		page_add_anon_rmap(kpage, vma, addr, false);
+		page_add_anon_rmap(kpage, vma, addr, RMAP_NONE);
 		newpte = mk_pte(kpage, vma->vm_page_prot);
 	} else {
 		newpte = pte_mkspecial(pfn_pte(page_to_pfn(kpage),
diff --git a/mm/memory.c b/mm/memory.c
index bbce3ca72974..e2d8e55c55c0 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3709,7 +3709,7 @@  vm_fault_t do_swap_page(struct vm_fault *vmf)
 		page_add_new_anon_rmap(page, vma, vmf->address, false);
 		lru_cache_add_inactive_or_unevictable(page, vma);
 	} else {
-		do_page_add_anon_rmap(page, vma, vmf->address, rmap_flags);
+		page_add_anon_rmap(page, vma, vmf->address, rmap_flags);
 	}
 
 	set_pte_at(vma->vm_mm, vmf->address, vmf->pte, pte);
diff --git a/mm/migrate.c b/mm/migrate.c
index 524c2648ab36..907052b72581 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -246,7 +246,8 @@  static bool remove_migration_pte(struct page *page, struct vm_area_struct *vma,
 #endif
 		{
 			if (PageAnon(new))
-				page_add_anon_rmap(new, vma, pvmw.address, false);
+				page_add_anon_rmap(new, vma, pvmw.address,
+						   RMAP_NONE);
 			else
 				page_add_file_rmap(new, false);
 			set_pte_at(vma->vm_mm, pvmw.address, pvmw.pte, pte);
diff --git a/mm/rmap.c b/mm/rmap.c
index 3d7028d100ea..97bcc50c3489 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1129,7 +1129,7 @@  static void __page_check_anon_rmap(struct page *page,
  * @page:	the page to add the mapping to
  * @vma:	the vm area in which the mapping is added
  * @address:	the user virtual address mapped
- * @compound:	charge the page as compound or small page
+ * @flags:	the rmap flags
  *
  * The caller needs to hold the pte lock, and the page must be locked in
  * the anon_vma case: to serialize mapping,index checking after setting,
@@ -1137,18 +1137,6 @@  static void __page_check_anon_rmap(struct page *page,
  * (but PageKsm is never downgraded to PageAnon).
  */
 void page_add_anon_rmap(struct page *page,
-	struct vm_area_struct *vma, unsigned long address, bool compound)
-{
-	do_page_add_anon_rmap(page, vma, address,
-			      compound ? RMAP_COMPOUND : RMAP_NONE);
-}
-
-/*
- * Special version of the above for do_swap_page, which often runs
- * into pages that are exclusively owned by the current process.
- * Everybody else should continue to use page_add_anon_rmap above.
- */
-void do_page_add_anon_rmap(struct page *page,
 	struct vm_area_struct *vma, unsigned long address, rmap_t flags)
 {
 	bool compound = flags & RMAP_COMPOUND;
diff --git a/mm/swapfile.c b/mm/swapfile.c
index a5183315dc58..41ba8238d16b 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1800,7 +1800,7 @@  static int unuse_pte(struct vm_area_struct *vma, pmd_t *pmd,
 	inc_mm_counter(vma->vm_mm, MM_ANONPAGES);
 	get_page(page);
 	if (page == swapcache) {
-		page_add_anon_rmap(page, vma, addr, false);
+		page_add_anon_rmap(page, vma, addr, RMAP_NONE);
 	} else { /* ksm created a completely new copy */
 		page_add_new_anon_rmap(page, vma, addr, false);
 		lru_cache_add_inactive_or_unevictable(page, vma);