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Date: Fri, 4 Feb 2022 19:58:35 +0000
From: "Matthew Wilcox (Oracle)" <willy@...radead.org>
To: linux-mm@...ck.org
Cc: "Matthew Wilcox (Oracle)" <willy@...radead.org>,
linux-kernel@...r.kernel.org
Subject: [PATCH 58/75] mm: Turn page_anon_vma() into folio_anon_vma()
Move the prototype from mm.h to mm/internal.h and convert all callers
to pass a folio.
Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
include/linux/mm.h | 1 -
mm/internal.h | 1 +
mm/ksm.c | 3 ++-
mm/rmap.c | 19 ++++++++++++-------
mm/util.c | 3 +--
5 files changed, 16 insertions(+), 11 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 028bd9336e82..74d9cda7cfd6 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1765,7 +1765,6 @@ static inline void *folio_address(const struct folio *folio)
}
extern void *page_rmapping(struct page *page);
-extern struct anon_vma *page_anon_vma(struct page *page);
extern pgoff_t __page_file_index(struct page *page);
/*
diff --git a/mm/internal.h b/mm/internal.h
index 66645972cbd7..360256e4ee06 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -393,6 +393,7 @@ static inline bool is_data_mapping(vm_flags_t flags)
void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma,
struct vm_area_struct *prev);
void __vma_unlink_list(struct mm_struct *mm, struct vm_area_struct *vma);
+struct anon_vma *folio_anon_vma(struct folio *folio);
#ifdef CONFIG_MMU
void unmap_mapping_folio(struct folio *folio);
diff --git a/mm/ksm.c b/mm/ksm.c
index 1639160c9e9a..212186dbc89f 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -2567,7 +2567,8 @@ void __ksm_exit(struct mm_struct *mm)
struct page *ksm_might_need_to_copy(struct page *page,
struct vm_area_struct *vma, unsigned long address)
{
- struct anon_vma *anon_vma = page_anon_vma(page);
+ struct folio *folio = page_folio(page);
+ struct anon_vma *anon_vma = folio_anon_vma(folio);
struct page *new_page;
if (PageKsm(page)) {
diff --git a/mm/rmap.c b/mm/rmap.c
index ba65d5d3eb5a..8bbbbea483cf 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -737,8 +737,9 @@ static bool should_defer_flush(struct mm_struct *mm, enum ttu_flags flags)
*/
unsigned long page_address_in_vma(struct page *page, struct vm_area_struct *vma)
{
- if (PageAnon(page)) {
- struct anon_vma *page__anon_vma = page_anon_vma(page);
+ struct folio *folio = page_folio(page);
+ if (folio_test_anon(folio)) {
+ struct anon_vma *page__anon_vma = folio_anon_vma(folio);
/*
* Note: swapoff's unuse_vma() is more efficient with this
* check, and needs it to match anon_vma when KSM is active.
@@ -748,7 +749,7 @@ unsigned long page_address_in_vma(struct page *page, struct vm_area_struct *vma)
return -EFAULT;
} else if (!vma->vm_file) {
return -EFAULT;
- } else if (vma->vm_file->f_mapping != compound_head(page)->mapping) {
+ } else if (vma->vm_file->f_mapping != folio->mapping) {
return -EFAULT;
}
@@ -1109,6 +1110,7 @@ static void __page_set_anon_rmap(struct page *page,
static void __page_check_anon_rmap(struct page *page,
struct vm_area_struct *vma, unsigned long address)
{
+ struct folio *folio = page_folio(page);
/*
* The page's anon-rmap details (mapping and index) are guaranteed to
* be set up correctly at this point.
@@ -1120,7 +1122,8 @@ static void __page_check_anon_rmap(struct page *page,
* are initially only visible via the pagetables, and the pte is locked
* over the call to page_add_new_anon_rmap.
*/
- VM_BUG_ON_PAGE(page_anon_vma(page)->root != vma->anon_vma->root, page);
+ VM_BUG_ON_FOLIO(folio_anon_vma(folio)->root != vma->anon_vma->root,
+ folio);
VM_BUG_ON_PAGE(page_to_pgoff(page) != linear_page_index(vma, address),
page);
}
@@ -2278,6 +2281,7 @@ void __put_anon_vma(struct anon_vma *anon_vma)
static struct anon_vma *rmap_walk_anon_lock(struct page *page,
struct rmap_walk_control *rwc)
{
+ struct folio *folio = page_folio(page);
struct anon_vma *anon_vma;
if (rwc->anon_lock)
@@ -2289,7 +2293,7 @@ static struct anon_vma *rmap_walk_anon_lock(struct page *page,
* are holding mmap_lock. Users without mmap_lock are required to
* take a reference count to prevent the anon_vma disappearing
*/
- anon_vma = page_anon_vma(page);
+ anon_vma = folio_anon_vma(folio);
if (!anon_vma)
return NULL;
@@ -2314,14 +2318,15 @@ static struct anon_vma *rmap_walk_anon_lock(struct page *page,
static void rmap_walk_anon(struct page *page, struct rmap_walk_control *rwc,
bool locked)
{
+ struct folio *folio = page_folio(page);
struct anon_vma *anon_vma;
pgoff_t pgoff_start, pgoff_end;
struct anon_vma_chain *avc;
if (locked) {
- anon_vma = page_anon_vma(page);
+ anon_vma = folio_anon_vma(folio);
/* anon_vma disappear under us? */
- VM_BUG_ON_PAGE(!anon_vma, page);
+ VM_BUG_ON_FOLIO(!anon_vma, folio);
} else {
anon_vma = rmap_walk_anon_lock(page, rwc);
}
diff --git a/mm/util.c b/mm/util.c
index b614f423aaa4..13fc88ac8e70 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -679,9 +679,8 @@ bool folio_mapped(struct folio *folio)
}
EXPORT_SYMBOL(folio_mapped);
-struct anon_vma *page_anon_vma(struct page *page)
+struct anon_vma *folio_anon_vma(struct folio *folio)
{
- struct folio *folio = page_folio(page);
unsigned long mapping = (unsigned long)folio->mapping;
if ((mapping & PAGE_MAPPING_FLAGS) != PAGE_MAPPING_ANON)
--
2.34.1
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