Mark the folio* argument to some of the folio accessor functions as a const pointer. Signed-off-by: David Howells <dhowells@xxxxxxxxxx> --- 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);