linux-stable/include/linux/page_idle.h
Ting Liu cab0a7c115 mm: make some vars and functions static or __init
"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.

Link: https://lkml.kernel.org/r/20211217095023.67293-1-liuting.0x7c00@bytedance.com
Signed-off-by: Ting Liu <liuting.0x7c00@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2022-01-15 16:30:31 +02:00

138 lines
2.7 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_MM_PAGE_IDLE_H
#define _LINUX_MM_PAGE_IDLE_H
#include <linux/bitops.h>
#include <linux/page-flags.h>
#include <linux/page_ext.h>
#ifdef CONFIG_PAGE_IDLE_FLAG
#ifndef CONFIG_64BIT
/*
* If there is not enough space to store Idle and Young bits in page flags, use
* page ext flags instead.
*/
static inline bool folio_test_young(struct folio *folio)
{
struct page_ext *page_ext = lookup_page_ext(&folio->page);
if (unlikely(!page_ext))
return false;
return test_bit(PAGE_EXT_YOUNG, &page_ext->flags);
}
static inline void folio_set_young(struct folio *folio)
{
struct page_ext *page_ext = lookup_page_ext(&folio->page);
if (unlikely(!page_ext))
return;
set_bit(PAGE_EXT_YOUNG, &page_ext->flags);
}
static inline bool folio_test_clear_young(struct folio *folio)
{
struct page_ext *page_ext = lookup_page_ext(&folio->page);
if (unlikely(!page_ext))
return false;
return test_and_clear_bit(PAGE_EXT_YOUNG, &page_ext->flags);
}
static inline bool folio_test_idle(struct folio *folio)
{
struct page_ext *page_ext = lookup_page_ext(&folio->page);
if (unlikely(!page_ext))
return false;
return test_bit(PAGE_EXT_IDLE, &page_ext->flags);
}
static inline void folio_set_idle(struct folio *folio)
{
struct page_ext *page_ext = lookup_page_ext(&folio->page);
if (unlikely(!page_ext))
return;
set_bit(PAGE_EXT_IDLE, &page_ext->flags);
}
static inline void folio_clear_idle(struct folio *folio)
{
struct page_ext *page_ext = lookup_page_ext(&folio->page);
if (unlikely(!page_ext))
return;
clear_bit(PAGE_EXT_IDLE, &page_ext->flags);
}
#endif /* !CONFIG_64BIT */
#else /* !CONFIG_PAGE_IDLE_FLAG */
static inline bool folio_test_young(struct folio *folio)
{
return false;
}
static inline void folio_set_young(struct folio *folio)
{
}
static inline bool folio_test_clear_young(struct folio *folio)
{
return false;
}
static inline bool folio_test_idle(struct folio *folio)
{
return false;
}
static inline void folio_set_idle(struct folio *folio)
{
}
static inline void folio_clear_idle(struct folio *folio)
{
}
#endif /* CONFIG_PAGE_IDLE_FLAG */
static inline bool page_is_young(struct page *page)
{
return folio_test_young(page_folio(page));
}
static inline void set_page_young(struct page *page)
{
folio_set_young(page_folio(page));
}
static inline bool test_and_clear_page_young(struct page *page)
{
return folio_test_clear_young(page_folio(page));
}
static inline bool page_is_idle(struct page *page)
{
return folio_test_idle(page_folio(page));
}
static inline void set_page_idle(struct page *page)
{
folio_set_idle(page_folio(page));
}
static inline void clear_page_idle(struct page *page)
{
folio_clear_idle(page_folio(page));
}
#endif /* _LINUX_MM_PAGE_IDLE_H */