On 1/26/21 11:51 PM, David Hildenbrand wrote:
> adjust_managed_page_count() as called by free_reserved_page() properly
> handles pages in a highmem zone, so we can reuse it for
> free_highmem_page().
>
> We can now get rid of totalhigh_pages_inc() and simplify
> free_reserved_page().
>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: "Peter Zijlstra (Intel)" <peterz@xxxxxxxxxxxxx>
> Cc: Mike Rapoport <rppt@xxxxxxxxxx>
> Cc: Oscar Salvador <osalvador@xxxxxxx>
> Cc: Michal Hocko <mhocko@xxxxxxxxxx>
> Cc: Wei Yang <richard.weiyang@xxxxxxxxxxxxxxxxx>
> Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
> ---
> include/linux/highmem-internal.h | 5 -----
> include/linux/mm.h | 16 ++--------------
> mm/page_alloc.c | 11 -----------
> 3 files changed, 2 insertions(+), 30 deletions(-)
>
> diff --git a/include/linux/highmem-internal.h b/include/linux/highmem-internal.h
> index 1bbe96dc8be6..7902c7d8b55f 100644
> --- a/include/linux/highmem-internal.h
> +++ b/include/linux/highmem-internal.h
> @@ -127,11 +127,6 @@ static inline unsigned long totalhigh_pages(void)
> return (unsigned long)atomic_long_read(&_totalhigh_pages);
> }
>
> -static inline void totalhigh_pages_inc(void)
> -{
> - atomic_long_inc(&_totalhigh_pages);
> -}
> -
> static inline void totalhigh_pages_add(long count)
> {
> atomic_long_add(count, &_totalhigh_pages);
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index a5d618d08506..494c69433a34 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -2303,32 +2303,20 @@ extern void free_initmem(void);
> extern unsigned long free_reserved_area(void *start, void *end,
> int poison, const char *s);
>
> -#ifdef CONFIG_HIGHMEM
> -/*
> - * Free a highmem page into the buddy system, adjusting totalhigh_pages
> - * and totalram_pages.
> - */
> -extern void free_highmem_page(struct page *page);
> -#endif
> -
> extern void adjust_managed_page_count(struct page *page, long count);
> extern void mem_init_print_info(const char *str);
>
> extern void reserve_bootmem_region(phys_addr_t start, phys_addr_t end);
>
> /* Free the reserved page into the buddy system, so it gets managed. */
> -static inline void __free_reserved_page(struct page *page)
> +static inline void free_reserved_page(struct page *page)
> {
> ClearPageReserved(page);
> init_page_count(page);
> __free_page(page);
> -}
> -
> -static inline void free_reserved_page(struct page *page)
> -{
> - __free_reserved_page(page);
> adjust_managed_page_count(page, 1);
> }
> +#define free_highmem_page(page) free_reserved_page(page)
>
> static inline void mark_page_reserved(struct page *page)
> {
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index b031a5ae0bd5..b2e42f10d4d4 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -7711,17 +7711,6 @@ unsigned long free_reserved_area(void *start, void *end, int poison, const char
> return pages;
> }
>
> -#ifdef CONFIG_HIGHMEM
> -void free_highmem_page(struct page *page)
> -{
> - __free_reserved_page(page);
> - totalram_pages_inc();
> - atomic_long_inc(&page_zone(page)->managed_pages);
> - totalhigh_pages_inc();
> -}
> -#endif
> -
> -
> void __init mem_init_print_info(const char *str)
> {
> unsigned long physpages, codesize, datasize, rosize, bss_size;
>
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