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From:   Peng Zhang <zhangpeng362@huawei.com>
To:     <linux-mm@kvack.org>, <linux-kernel@vger.kernel.org>
CC:     <willy@infradead.org>, <sidhartha.kumar@oracle.com>,
        <akpm@linux-foundation.org>, <wangkefeng.wang@huawei.com>,
        <sunnanyong@huawei.com>, ZhangPeng <zhangpeng362@huawei.com>
Subject: [PATCH 1/2] mm: remove page_rmapping()
Date:   Fri, 30 Jun 2023 20:13:09 +0800
Message-ID: <20230630121310.165700-2-zhangpeng362@huawei.com>
In-Reply-To: <20230630121310.165700-1-zhangpeng362@huawei.com>
References: <20230630121310.165700-1-zhangpeng362@huawei.com>
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From: ZhangPeng <zhangpeng362@huawei.com>

After converting the last user to folio_raw_mapping(), we can safely
remove the function.

Signed-off-by: ZhangPeng <zhangpeng362@huawei.com>
---
 include/linux/mm.h | 1 -
 mm/memory.c        | 2 +-
 mm/util.c          | 6 ------
 3 files changed, 1 insertion(+), 8 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 9ecb8b9c07f6..8c7eba7370b2 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2129,7 +2129,6 @@ static inline void *folio_address(const struct folio *folio)
 	return page_address(&folio->page);
 }
 
-extern void *page_rmapping(struct page *page);
 extern pgoff_t __page_file_index(struct page *page);
 
 /*
diff --git a/mm/memory.c b/mm/memory.c
index 21fab2727209..6921df44a99f 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2979,7 +2979,7 @@ static vm_fault_t fault_dirty_shared_page(struct vm_fault *vmf)
 	 * pinned by vma->vm_file's reference.  We rely on unlock_page()'s
 	 * release semantics to prevent the compiler from undoing this copying.
 	 */
-	mapping = page_rmapping(page);
+	mapping = folio_raw_mapping(page_folio(page));
 	unlock_page(page);
 
 	if (!page_mkwrite)
diff --git a/mm/util.c b/mm/util.c
index dd12b9531ac4..5e9305189c3f 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -734,12 +734,6 @@ void *vcalloc(size_t n, size_t size)
 }
 EXPORT_SYMBOL(vcalloc);
 
-/* Neutral page->mapping pointer to address_space or anon_vma or other */
-void *page_rmapping(struct page *page)
-{
-	return folio_raw_mapping(page_folio(page));
-}
-
 struct anon_vma *folio_anon_vma(struct folio *folio)
 {
 	unsigned long mapping = (unsigned long)folio->mapping;
-- 
2.25.1