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f86e427197
Per the discussion with Joonsoo Kim [1], we need check the return value of lookup_page_ext() for all call sites since it might return NULL in some cases, although it is unlikely, i.e. memory hotplug. Tested with ltp with "page_owner=0". [1] http://lkml.kernel.org/r/20160519002809.GA10245@js1304-P5Q-DELUXE [akpm@linux-foundation.org: fix build-breaking typos] [arnd@arndb.de: fix build problems from lookup_page_ext] Link: http://lkml.kernel.org/r/6285269.2CksypHdYp@wuerfel [akpm@linux-foundation.org: coding-style fixes] Link: http://lkml.kernel.org/r/1464023768-31025-1-git-send-email-yang.shi@linaro.org Signed-off-by: Yang Shi <yang.shi@linaro.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
140 lines
2.6 KiB
C
140 lines
2.6 KiB
C
#ifndef _LINUX_MM_PAGE_IDLE_H
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#define _LINUX_MM_PAGE_IDLE_H
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#include <linux/bitops.h>
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#include <linux/page-flags.h>
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#include <linux/page_ext.h>
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#ifdef CONFIG_IDLE_PAGE_TRACKING
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#ifdef CONFIG_64BIT
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static inline bool page_is_young(struct page *page)
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{
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return PageYoung(page);
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}
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static inline void set_page_young(struct page *page)
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{
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SetPageYoung(page);
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}
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static inline bool test_and_clear_page_young(struct page *page)
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{
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return TestClearPageYoung(page);
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}
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static inline bool page_is_idle(struct page *page)
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{
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return PageIdle(page);
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}
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static inline void set_page_idle(struct page *page)
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{
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SetPageIdle(page);
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}
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static inline void clear_page_idle(struct page *page)
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{
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ClearPageIdle(page);
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}
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#else /* !CONFIG_64BIT */
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/*
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* If there is not enough space to store Idle and Young bits in page flags, use
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* page ext flags instead.
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*/
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extern struct page_ext_operations page_idle_ops;
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static inline bool page_is_young(struct page *page)
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{
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struct page_ext *page_ext = lookup_page_ext(page);
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if (unlikely(!page_ext))
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return false;
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return test_bit(PAGE_EXT_YOUNG, &page_ext->flags);
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}
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static inline void set_page_young(struct page *page)
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{
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struct page_ext *page_ext = lookup_page_ext(page);
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if (unlikely(!page_ext))
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return;
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set_bit(PAGE_EXT_YOUNG, &page_ext->flags);
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}
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static inline bool test_and_clear_page_young(struct page *page)
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{
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struct page_ext *page_ext = lookup_page_ext(page);
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if (unlikely(!page_ext))
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return false;
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return test_and_clear_bit(PAGE_EXT_YOUNG, &page_ext->flags);
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}
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static inline bool page_is_idle(struct page *page)
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{
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struct page_ext *page_ext = lookup_page_ext(page);
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if (unlikely(!page_ext))
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return false;
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return test_bit(PAGE_EXT_IDLE, &page_ext->flags);
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}
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static inline void set_page_idle(struct page *page)
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{
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struct page_ext *page_ext = lookup_page_ext(page);
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if (unlikely(!page_ext))
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return;
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set_bit(PAGE_EXT_IDLE, &page_ext->flags);
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}
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static inline void clear_page_idle(struct page *page)
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{
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struct page_ext *page_ext = lookup_page_ext(page);
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if (unlikely(!page_ext))
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return;
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clear_bit(PAGE_EXT_IDLE, &page_ext->flags);
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}
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#endif /* CONFIG_64BIT */
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#else /* !CONFIG_IDLE_PAGE_TRACKING */
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static inline bool page_is_young(struct page *page)
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{
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return false;
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}
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static inline void set_page_young(struct page *page)
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{
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}
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static inline bool test_and_clear_page_young(struct page *page)
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{
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return false;
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}
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static inline bool page_is_idle(struct page *page)
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{
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return false;
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}
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static inline void set_page_idle(struct page *page)
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{
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}
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static inline void clear_page_idle(struct page *page)
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{
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}
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#endif /* CONFIG_IDLE_PAGE_TRACKING */
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#endif /* _LINUX_MM_PAGE_IDLE_H */
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