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Message-ID: <20240510114747.21548-12-ryncsn@gmail.com>
Date: Fri, 10 May 2024 19:47:46 +0800
From: Kairui Song <ryncsn@...il.com>
To: linux-mm@...ck.org
Cc: Andrew Morton <akpm@...ux-foundation.org>,
"Huang, Ying" <ying.huang@...el.com>,
Matthew Wilcox <willy@...radead.org>,
Chris Li <chrisl@...nel.org>,
Barry Song <v-songbaohua@...o.com>,
Ryan Roberts <ryan.roberts@....com>,
Neil Brown <neilb@...e.de>,
Minchan Kim <minchan@...nel.org>,
David Hildenbrand <david@...hat.com>,
Hugh Dickins <hughd@...gle.com>,
Yosry Ahmed <yosryahmed@...gle.com>,
linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org,
Kairui Song <kasong@...cent.com>
Subject: [PATCH v5 11/12] mm: drop page_index and simplify folio_index
From: Kairui Song <kasong@...cent.com>
There are two helpers for retrieving the index within address space
for mixed usage of swap cache and page cache:
- page_index
- folio_index
This commit drops page_index, as we have eliminated all users, and
converts folio_index's helper __page_file_index to use folio to avoid
the page convertion.
Signed-off-by: Kairui Song <kasong@...cent.com>
---
include/linux/mm.h | 13 -------------
include/linux/pagemap.h | 8 ++++----
mm/swapfile.c | 7 +++----
3 files changed, 7 insertions(+), 21 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 9849dfda44d4..e2718cac0fda 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2290,19 +2290,6 @@ static inline void *folio_address(const struct folio *folio)
return page_address(&folio->page);
}
-extern pgoff_t __page_file_index(struct page *page);
-
-/*
- * Return the pagecache index of the passed page. Regular pagecache pages
- * use ->index whereas swapcache pages use swp_offset(->private)
- */
-static inline pgoff_t page_index(struct page *page)
-{
- if (unlikely(PageSwapCache(page)))
- return __page_file_index(page);
- return page->index;
-}
-
/*
* Return true only if the page has been allocated with
* ALLOC_NO_WATERMARKS and the low watermark was not
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index a324582ea702..0cfa5810cde3 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -778,7 +778,7 @@ static inline struct page *grab_cache_page_nowait(struct address_space *mapping,
mapping_gfp_mask(mapping));
}
-#define swapcache_index(folio) __page_file_index(&(folio)->page)
+extern pgoff_t __folio_swap_cache_index(struct folio *folio);
/**
* folio_index - File index of a folio.
@@ -793,9 +793,9 @@ static inline struct page *grab_cache_page_nowait(struct address_space *mapping,
*/
static inline pgoff_t folio_index(struct folio *folio)
{
- if (unlikely(folio_test_swapcache(folio)))
- return swapcache_index(folio);
- return folio->index;
+ if (unlikely(folio_test_swapcache(folio)))
+ return __folio_swap_cache_index(folio);
+ return folio->index;
}
/**
diff --git a/mm/swapfile.c b/mm/swapfile.c
index f6ca215fb92f..0b0ae6e8c764 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -3474,12 +3474,11 @@ struct address_space *swapcache_mapping(struct folio *folio)
}
EXPORT_SYMBOL_GPL(swapcache_mapping);
-pgoff_t __page_file_index(struct page *page)
+pgoff_t __folio_swap_cache_index(struct folio *folio)
{
- swp_entry_t swap = page_swap_entry(page);
- return swp_offset(swap);
+ return swp_offset(folio->swap);
}
-EXPORT_SYMBOL_GPL(__page_file_index);
+EXPORT_SYMBOL_GPL(__folio_swap_cache_index);
/*
* add_swap_count_continuation - called when a swap count is duplicated
--
2.45.0
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