linux-kernel - [PATCH] [mm-unstable] mm/folio: Replace set_compound_order with folio_set

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Date:   Mon, 12 Jun 2023 15:05:14 +0530
From:   Tarun Sahu <tsahu@...ux.ibm.com>
To:     linux-mm@...ck.org
Cc:     akpm@...ux-foundation.org, muchun.song@...ux.dev,
        mike.kravetz@...cle.com, aneesh.kumar@...ux.ibm.com,
        willy@...radead.org, sidhartha.kumar@...cle.com,
        gerald.schaefer@...ux.ibm.com, linux-kernel@...r.kernel.org,
        jaypatel@...ux.ibm.com, tsahu@...ux.ibm.com
Subject: [PATCH] [mm-unstable] mm/folio: Replace set_compound_order with folio_set_order

The patch [1] removed the need for special handling of order = 0
in folio_set_order. Now, folio_set_order and set_compound_order becomes
similar function. This patch removes the set_compound_order and uses
folio_set_order instead.

[1] https://lore.kernel.org/all/20230609183032.13E08C433D2@smtp.kernel.org/

Signed-off-by: Tarun Sahu <tsahu@...ux.ibm.com>
---
Moved folio_set_order to the top instead of moving prep_compound_head below
to it so that git blame can show the proper change in prep_compound_head
which is replacement of set_compound_order with folio_set_order.

 include/linux/mm.h | 10 ----------
 mm/internal.h      | 32 ++++++++++++++++----------------
 2 files changed, 16 insertions(+), 26 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 27ce77080c79..61d75e0e5b40 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1229,16 +1229,6 @@ static inline void folio_set_compound_dtor(struct folio *folio,
 
 void destroy_large_folio(struct folio *folio);
 
-static inline void set_compound_order(struct page *page, unsigned int order)
-{
-	struct folio *folio = (struct folio *)page;
-
-	folio->_folio_order = order;
-#ifdef CONFIG_64BIT
-	folio->_folio_nr_pages = 1U << order;
-#endif
-}
-
 /* Returns the number of bytes in this potentially compound page. */
 static inline unsigned long page_size(struct page *page)
 {
diff --git a/mm/internal.h b/mm/internal.h
index c59fe08c5b39..c460b2fde977 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -378,12 +378,27 @@ extern void memblock_free_pages(struct page *page, unsigned long pfn,
 					unsigned int order);
 extern void __free_pages_core(struct page *page, unsigned int order);
 
+/*
+ * This will have no effect, other than possibly generating a warning, if the
+ * caller passes in a non-large folio.
+ */
+static inline void folio_set_order(struct folio *folio, unsigned int order)
+{
+	if (WARN_ON_ONCE(!order || !folio_test_large(folio)))
+		return;
+
+	folio->_folio_order = order;
+#ifdef CONFIG_64BIT
+	folio->_folio_nr_pages = 1U << order;
+#endif
+}
+
 static inline void prep_compound_head(struct page *page, unsigned int order)
 {
 	struct folio *folio = (struct folio *)page;
 
 	set_compound_page_dtor(page, COMPOUND_PAGE_DTOR);
-	set_compound_order(page, order);
+	folio_set_order(folio, order);
 	atomic_set(&folio->_entire_mapcount, -1);
 	atomic_set(&folio->_nr_pages_mapped, 0);
 	atomic_set(&folio->_pincount, 0);
@@ -419,21 +434,6 @@ extern void *memmap_alloc(phys_addr_t size, phys_addr_t align,
 int split_free_page(struct page *free_page,
 			unsigned int order, unsigned long split_pfn_offset);
 
-/*
- * This will have no effect, other than possibly generating a warning, if the
- * caller passes in a non-large folio.
- */
-static inline void folio_set_order(struct folio *folio, unsigned int order)
-{
-	if (WARN_ON_ONCE(!order || !folio_test_large(folio)))
-		return;
-
-	folio->_folio_order = order;
-#ifdef CONFIG_64BIT
-	folio->_folio_nr_pages = 1U << order;
-#endif
-}
-
 #if defined CONFIG_COMPACTION || defined CONFIG_CMA
 
 /*
-- 
2.31.1