linux-kernel - [PATCH] mm: Make some folio function arguments const

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Message-ID: <166809951250.3381741.3113541135557341907.stgit@warthog.procyon.org.uk>
Date:   Thu, 10 Nov 2022 16:58:32 +0000
From:   David Howells <dhowells@...hat.com>
To:     willy@...radead.org
Cc:     dhowells@...hat.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] mm: Make some folio function arguments const

Mark the folio* argument to some of the folio accessor functions as a const
pointer.

Signed-off-by: David Howells <dhowells@...hat.com>
---

 include/linux/mm.h         |   20 ++++++++++----------
 include/linux/page-flags.h |    4 ++--
 2 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 7a7a287818ad..a069f6f70aed 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -711,7 +711,7 @@ int vma_is_stack_for_current(struct vm_area_struct *vma);
 struct mmu_gather;
 struct inode;
 
-static inline unsigned int compound_order(struct page *page)
+static inline unsigned int compound_order(const struct page *page)
 {
 	if (!PageHead(page))
 		return 0;
@@ -727,7 +727,7 @@ static inline unsigned int compound_order(struct page *page)
  *
  * Return: The order of the folio.
  */
-static inline unsigned int folio_order(struct folio *folio)
+static inline unsigned int folio_order(const struct folio *folio)
 {
 	if (!folio_test_large(folio))
 		return 0;
@@ -945,7 +945,7 @@ static inline void set_compound_order(struct page *page, unsigned int order)
 }
 
 /* Returns the number of pages in this potentially compound page. */
-static inline unsigned long compound_nr(struct page *page)
+static inline unsigned long compound_nr(const struct page *page)
 {
 	if (!PageHead(page))
 		return 1;
@@ -1519,7 +1519,7 @@ static inline unsigned long page_to_section(const struct page *page)
  *
  * Return: The Page Frame Number of the first page in the folio.
  */
-static inline unsigned long folio_pfn(struct folio *folio)
+static inline unsigned long folio_pfn(const struct folio *folio)
 {
 	return page_to_pfn(&folio->page);
 }
@@ -1600,7 +1600,7 @@ static inline bool page_needs_cow_for_dma(struct vm_area_struct *vma,
 
 /* MIGRATE_CMA and ZONE_MOVABLE do not allow pin pages */
 #ifdef CONFIG_MIGRATION
-static inline bool is_longterm_pinnable_page(struct page *page)
+static inline bool is_longterm_pinnable_page(const struct page *page)
 {
 #ifdef CONFIG_CMA
 	int mt = get_pageblock_migratetype(page);
@@ -1620,13 +1620,13 @@ static inline bool is_longterm_pinnable_page(struct page *page)
 	return !is_zone_movable_page(page);
 }
 #else
-static inline bool is_longterm_pinnable_page(struct page *page)
+static inline bool is_longterm_pinnable_page(const struct page *page)
 {
 	return true;
 }
 #endif
 
-static inline bool folio_is_longterm_pinnable(struct folio *folio)
+static inline bool folio_is_longterm_pinnable(const struct folio *folio)
 {
 	return is_longterm_pinnable_page(&folio->page);
 }
@@ -1659,7 +1659,7 @@ static inline void set_page_links(struct page *page, enum zone_type zone,
  *
  * Return: A positive power of two.
  */
-static inline long folio_nr_pages(struct folio *folio)
+static inline long folio_nr_pages(const struct folio *folio)
 {
 	if (!folio_test_large(folio))
 		return 1;
@@ -1701,7 +1701,7 @@ static inline struct folio *folio_next(struct folio *folio)
  * it from being split.  It is not necessary for the folio to be locked.
  * Return: The base-2 logarithm of the size of this folio.
  */
-static inline unsigned int folio_shift(struct folio *folio)
+static inline unsigned int folio_shift(const struct folio *folio)
 {
 	return PAGE_SHIFT + folio_order(folio);
 }
@@ -1714,7 +1714,7 @@ static inline unsigned int folio_shift(struct folio *folio)
  * it from being split.  It is not necessary for the folio to be locked.
  * Return: The number of bytes in this folio.
  */
-static inline size_t folio_size(struct folio *folio)
+static inline size_t folio_size(const struct folio *folio)
 {
 	return PAGE_SIZE << folio_order(folio);
 }
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 0b0ae5084e60..89599570c895 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -243,7 +243,7 @@ static inline const struct page *page_fixed_fake_head(const struct page *page)
 }
 #endif
 
-static __always_inline int page_is_fake_head(struct page *page)
+static __always_inline int page_is_fake_head(const struct page *page)
 {
 	return page_fixed_fake_head(page) != page;
 }
@@ -782,7 +782,7 @@ static __always_inline bool folio_test_head(struct folio *folio)
 	return test_bit(PG_head, folio_flags(folio, FOLIO_PF_ANY));
 }
 
-static __always_inline int PageHead(struct page *page)
+static __always_inline int PageHead(const struct page *page)
 {
 	PF_POISONED_CHECK(page);
 	return test_bit(PG_head, &page->flags) && !page_is_fake_head(page);