linux-kernel - [PATCH 5/5] folio-compat: Remove lru_cache

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Date:   Tue,  1 Nov 2022 10:53:26 -0700
From:   "Vishal Moola (Oracle)" <vishal.moola@...il.com>
To:     linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        akpm@...ux-foundation.org, willy@...radead.org, miklos@...redi.hu,
        "Vishal Moola (Oracle)" <vishal.moola@...il.com>
Subject: [PATCH 5/5] folio-compat: Remove lru_cache_add()

There are no longer any callers of lru_cache_add(), so remove it. This
saves 107 bytes of kernel text. Also cleanup some comments such that
they reference the new folio_add_lru() instead.

Signed-off-by: Vishal Moola (Oracle) <vishal.moola@...il.com>
---
 include/linux/swap.h | 1 -
 mm/folio-compat.c    | 6 ------
 mm/truncate.c        | 2 +-
 mm/workingset.c      | 2 +-
 4 files changed, 2 insertions(+), 9 deletions(-)

diff --git a/include/linux/swap.h b/include/linux/swap.h
index a18cf4b7c724..c92ccff9b962 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -388,7 +388,6 @@ void lru_note_cost(struct lruvec *lruvec, bool file, unsigned int nr_pages);
 void lru_note_cost_folio(struct folio *);
 void folio_add_lru(struct folio *);
 void folio_add_lru_vma(struct folio *, struct vm_area_struct *);
-void lru_cache_add(struct page *);
 void mark_page_accessed(struct page *);
 void folio_mark_accessed(struct folio *);
 
diff --git a/mm/folio-compat.c b/mm/folio-compat.c
index e1e23b4947d7..efd65b7f48bb 100644
--- a/mm/folio-compat.c
+++ b/mm/folio-compat.c
@@ -82,12 +82,6 @@ bool redirty_page_for_writepage(struct writeback_control *wbc,
 }
 EXPORT_SYMBOL(redirty_page_for_writepage);
 
-void lru_cache_add(struct page *page)
-{
-	folio_add_lru(page_folio(page));
-}
-EXPORT_SYMBOL(lru_cache_add);
-
 void lru_cache_add_inactive_or_unevictable(struct page *page,
 		struct vm_area_struct *vma)
 {
diff --git a/mm/truncate.c b/mm/truncate.c
index c0be77e5c008..184fa17fce60 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -573,7 +573,7 @@ EXPORT_SYMBOL(invalidate_mapping_pages);
  * refcount.  We do this because invalidate_inode_pages2() needs stronger
  * invalidation guarantees, and cannot afford to leave pages behind because
  * shrink_page_list() has a temp ref on them, or because they're transiently
- * sitting in the lru_cache_add() pagevecs.
+ * sitting in the folio_add_lru() pagevecs.
  */
 static int invalidate_complete_folio2(struct address_space *mapping,
 					struct folio *folio)
diff --git a/mm/workingset.c b/mm/workingset.c
index ae7e984b23c6..25844171b72d 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -492,7 +492,7 @@ void workingset_refault(struct folio *folio, void *shadow)
 	/* Folio was active prior to eviction */
 	if (workingset) {
 		folio_set_workingset(folio);
-		/* XXX: Move to lru_cache_add() when it supports new vs putback */
+		/* XXX: Move to folio_add_lru() when it supports new vs putback */
 		lru_note_cost_folio(folio);
 		mod_lruvec_state(lruvec, WORKINGSET_RESTORE_BASE + file, nr);
 	}
-- 
2.38.1