linux-kernel - [PATCH v2 16/28] mm: Remove page_cache_add_speculative() and page_cache_get

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Date:   Mon, 10 Jan 2022 04:23:54 +0000
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     linux-mm@...ck.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        John Hubbard <jhubbard@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        William Kucharski <william.kucharski@...cle.com>,
        linux-kernel@...r.kernel.org, Jason Gunthorpe <jgg@...pe.ca>
Subject: [PATCH v2 16/28] mm: Remove page_cache_add_speculative() and page_cache_get_speculative()

These wrappers have no more callers, so delete them.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 include/linux/mm.h      |  7 +++----
 include/linux/pagemap.h | 11 -----------
 2 files changed, 3 insertions(+), 15 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index d3769897c8ac..b249156f7cf1 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1291,10 +1291,9 @@ static inline void put_page(struct page *page)
  * applications that don't have huge page reference counts, this won't be an
  * issue.
  *
- * Locking: the lockless algorithm described in page_cache_get_speculative()
- * and page_cache_gup_pin_speculative() provides safe operation for
- * get_user_pages and page_mkclean and other calls that race to set up page
- * table entries.
+ * Locking: the lockless algorithm described in folio_try_get_rcu()
+ * provides safe operation for get_user_pages(), page_mkclean() and
+ * other calls that race to set up page table entries.
  */
 #define GUP_PIN_COUNTING_BIAS (1U << 10)
 
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 704cb1b4b15d..4a63176b6417 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -283,17 +283,6 @@ static inline struct inode *folio_inode(struct folio *folio)
 	return folio->mapping->host;
 }
 
-static inline bool page_cache_add_speculative(struct page *page, int count)
-{
-	VM_BUG_ON_PAGE(PageTail(page), page);
-	return folio_ref_try_add_rcu((struct folio *)page, count);
-}
-
-static inline bool page_cache_get_speculative(struct page *page)
-{
-	return page_cache_add_speculative(page, 1);
-}
-
 /**
  * folio_attach_private - Attach private data to a folio.
  * @folio: Folio to attach data to.
-- 
2.33.0