linux-kernel - [PATCH RFC 32/39] mm/rmap: remove page_remove

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Message-ID: <20231204142146.91437-33-david@redhat.com>
Date:   Mon,  4 Dec 2023 15:21:39 +0100
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Hugh Dickins <hughd@...gle.com>,
        Ryan Roberts <ryan.roberts@....com>,
        Yin Fengwei <fengwei.yin@...el.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Muchun Song <muchun.song@...ux.dev>,
        Peter Xu <peterx@...hat.com>
Subject: [PATCH RFC 32/39] mm/rmap: remove page_remove_rmap()

All callers are gone, let's remove it and some leftover traces.

Signed-off-by: David Hildenbrand <david@...hat.com>
---
 include/linux/rmap.h |  4 +---
 mm/internal.h        |  2 +-
 mm/memory-failure.c  |  4 ++--
 mm/rmap.c            | 23 ++---------------------
 4 files changed, 6 insertions(+), 27 deletions(-)

diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index dd4ffb1d8ae04..bdbfb11638e4f 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -239,8 +239,6 @@ void folio_add_file_rmap_ptes(struct folio *, struct page *, unsigned int nr,
 	folio_add_file_rmap_ptes(folio, page, 1, vma)
 void folio_add_file_rmap_pmd(struct folio *, struct page *,
 		struct vm_area_struct *);
-void page_remove_rmap(struct page *, struct vm_area_struct *,
-		bool compound);
 void folio_remove_rmap_ptes(struct folio *, struct page *, unsigned int nr,
 		struct vm_area_struct *);
 #define folio_remove_rmap_pte(folio, page, vma) \
@@ -384,7 +382,7 @@ static inline int page_try_dup_anon_rmap(struct page *page, bool compound,
  *
  * This is similar to page_try_dup_anon_rmap(), however, not used during fork()
  * to duplicate a mapping, but instead to prepare for KSM or temporarily
- * unmapping a page (swap, migration) via page_remove_rmap().
+ * unmapping a page (swap, migration) via folio_remove_rmap_*().
  *
  * Marking the page shared can only fail if the page may be pinned; device
  * private pages cannot get pinned and consequently this function cannot fail.
diff --git a/mm/internal.h b/mm/internal.h
index b61034bd50f5f..43dca750c5afc 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -651,7 +651,7 @@ folio_within_vma(struct folio *folio, struct vm_area_struct *vma)
  * under page table lock for the pte/pmd being added or removed.
  *
  * mlock is usually called at the end of page_add_*_rmap(), munlock at
- * the end of page_remove_rmap(); but new anon folios are managed by
+ * the end of folio_remove_rmap_*(); but new anon folios are managed by
  * folio_add_lru_vma() calling mlock_new_folio().
  */
 void mlock_folio(struct folio *folio);
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 660c21859118e..d0251cba84795 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -2317,8 +2317,8 @@ int memory_failure(unsigned long pfn, int flags)
 	 * We use page flags to determine what action should be taken, but
 	 * the flags can be modified by the error containment action.  One
 	 * example is an mlocked page, where PG_mlocked is cleared by
-	 * page_remove_rmap() in try_to_unmap_one(). So to determine page status
-	 * correctly, we save a copy of the page flags at this time.
+	 * folio_remove_rmap_*() in try_to_unmap_one(). So to determine page
+	 * status correctly, we save a copy of the page flags at this time.
 	 */
 	page_flags = p->flags;
 
diff --git a/mm/rmap.c b/mm/rmap.c
index 4a0114d04ab48..8e86024953c03 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -470,7 +470,7 @@ void __init anon_vma_init(void)
 /*
  * Getting a lock on a stable anon_vma from a page off the LRU is tricky!
  *
- * Since there is no serialization what so ever against page_remove_rmap()
+ * Since there is no serialization what so ever against folio_remove_rmap_*()
  * the best this function can do is return a refcount increased anon_vma
  * that might have been relevant to this page.
  *
@@ -487,7 +487,7 @@ void __init anon_vma_init(void)
  * [ something equivalent to page_mapped_in_vma() ].
  *
  * Since anon_vma's slab is SLAB_TYPESAFE_BY_RCU and we know from
- * page_remove_rmap() that the anon_vma pointer from page->mapping is valid
+ * folio_remove_rmap_*() that the anon_vma pointer from page->mapping is valid
  * if there is a mapcount, we can dereference the anon_vma after observing
  * those.
  */
@@ -1451,25 +1451,6 @@ void folio_add_file_rmap_pmd(struct folio *folio, struct page *page,
 #endif
 }
 
-/**
- * page_remove_rmap - take down pte mapping from a page
- * @page:	page to remove mapping from
- * @vma:	the vm area from which the mapping is removed
- * @compound:	uncharge the page as compound or small page
- *
- * The caller needs to hold the pte lock.
- */
-void page_remove_rmap(struct page *page, struct vm_area_struct *vma,
-		bool compound)
-{
-	struct folio *folio = page_folio(page);
-
-	if (likely(!compound))
-		folio_remove_rmap_pte(folio, page, vma);
-	else
-		folio_remove_rmap_pmd(folio, page, vma);
-}
-
 static __always_inline void __folio_remove_rmap(struct folio *folio,
 		struct page *page, unsigned int nr_pages,
 		struct vm_area_struct *vma, enum rmap_mode mode)
-- 
2.41.0