On Wed, Dec 15, 2021 at 1:27 PM Ting Liu <liuting.0x7c00@xxxxxxxxxxxxx> wrote:
>
> From: "liuting.0x7c00" <liuting.0x7c00@xxxxxxxxxxxxx>
>
> "page_idle_ops" as a global var, but its scope of use within this
> document. So it should be static.
> "page_ext_ops" is a var used in the kernel initial phase. And other
> functions are aslo used in the kernel initial phase. So they should be
> __init or __initdata to reclaim memory.
>
> Signed-off-by: liuting.0x7c00 <liuting.0x7c00@xxxxxxxxxxxxx>
> ---
> include/linux/page_idle.h | 1 -
> mm/page_ext.c | 4 ++--
> mm/page_owner.c | 4 ++--
> 3 files changed, 4 insertions(+), 5 deletions(-)
>
> diff --git a/include/linux/page_idle.h b/include/linux/page_idle.h
> index 83abf95e9fa7..4663dfed1293 100644
> --- a/include/linux/page_idle.h
> +++ b/include/linux/page_idle.h
> @@ -13,7 +13,6 @@
> * If there is not enough space to store Idle and Young bits in page flags, use
> * page ext flags instead.
> */
> -extern struct page_ext_operations page_idle_ops;
>
> static inline bool folio_test_young(struct folio *folio)
> {
> diff --git a/mm/page_ext.c b/mm/page_ext.c
> index 6242afb24d84..2193e3f10e56 100644
> --- a/mm/page_ext.c
> +++ b/mm/page_ext.c
> @@ -63,12 +63,12 @@ static bool need_page_idle(void)
Should need_page_idle be marked as __init?
It is used in the initialization stage.
> {
> return true;
> }
> -struct page_ext_operations page_idle_ops = {
> +static struct page_ext_operations page_idle_ops = {
> .need = need_page_idle,
> };
page_idle_ops is also used in the initialization stage.
It also can be marked as __initdata.
> #endif
>
> -static struct page_ext_operations *page_ext_ops[] = {
> +static struct page_ext_operations *page_ext_ops[] __initdata = {
> #ifdef CONFIG_PAGE_OWNER
> &page_owner_ops,
> #endif
> diff --git a/mm/page_owner.c b/mm/page_owner.c
> index 4f924957ce7a..5eea061bb1e5 100644
> --- a/mm/page_owner.c
> +++ b/mm/page_owner.c
> @@ -46,7 +46,7 @@ static int __init early_page_owner_param(char *buf)
> }
> early_param("page_owner", early_page_owner_param);
>
> -static bool need_page_owner(void)
> +static __init bool need_page_owner(void)
> {
> return page_owner_enabled;
> }
> @@ -75,7 +75,7 @@ static noinline void register_early_stack(void)
> early_handle = create_dummy_stack();
> }
>
> -static void init_page_owner(void)
> +static __init void init_page_owner(void)
> {
> if (!page_owner_enabled)
> return;
> --
> 2.20.1
>
