[PATCH v4 06/17] mm/rmap: remove do_page_add_anon_rmap()

David Hildenbrand
2022-04-28T08:38:41Z

... 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.

Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
include/linux/rmap.h | 2 --
mm/huge_memory.c | 2 +-
mm/ksm.c | 2 +-
mm/memory.c | 4 ++--
mm/migrate.c | 3 ++-
mm/rmap.c | 14 +-------------
mm/swapfile.c | 2 +-
7 files changed, 8 insertions(+), 21 deletions(-)

diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index 2d0f12119a13..aa734d2e2b01 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -183,8 +183,6 @@ 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 address, bool compound);
-void do_page_add_anon_rmap(struct page *, struct vm_area_struct *,
unsigned long address, rmap_t flags);
void page_add_new_anon_rmap(struct page *, struct vm_area_struct *,
unsigned long address, bool compound);
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index baf4ea6d8e1a..6232b6817fab 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -3072,7 +3072,7 @@ void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, struct page *new)
pmde = pmd_wrprotect(pmd_mkuffd_wp(pmde));

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, vma, true);
set_pmd_at(mm, mmun_start, pvmw->pmd, pmde);
diff --git a/mm/ksm.c b/mm/ksm.c
index 063a48eeb5ee..e0fb748e37b3 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -1150,7 +1150,7 @@ 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 414f4cf4fcf1..f46504191571 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -725,7 +725,7 @@ static void restore_exclusive_pte(struct vm_area_struct *vma,
* created when the swap entry was made.
*/
if (PageAnon(page))
- page_add_anon_rmap(page, vma, address, false);
+ page_add_anon_rmap(page, vma, address, RMAP_NONE);
else
/*
* Currently device exclusive access only supports anonymous
@@ -3701,7 +3701,7 @@ 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 dd9ceb778e94..1e1d9519e05c 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -240,7 +240,8 @@ static bool remove_migration_pte(struct folio *folio,
#endif
{
if (folio_test_anon(folio))
- 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, vma, false);
set_pte_at(vma->vm_mm, pvmw.address, pvmw.pte, pte);
diff --git a/mm/rmap.c b/mm/rmap.c
index 8359aed9255e..ee349f905da0 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1127,7 +1127,7 @@ 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,
@@ -1135,18 +1135,6 @@ 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 63c61f8b2611..1ba525a2179d 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);
--
2.35.1