get_page_unless

函数名称：Try to grab a ref unless the page has a refcount of zero, return false if* that is the case.* This can be called when MMU is off so it must not access* any of the virtual mappings.

函数原型：static inline int get_page_unless_zero(struct page *page)

返回类型：int

参数：

类型	参数	名称
struct page *	page

**调用者**
名称	描述
deactivate_file_page	deactivate_file_page - forcefully deactivate a file page@page: page to deactivate This function hints the VM that @page is a good reclaim candidate,* for example if its invalidation fails due to the page being dirty* or under writeback.
__isolate_lru_page	Attempt to remove the specified page from its LRU. Only take this page* if it is of the appropriate PageActive status. Pages which are being* freed elsewhere are also ignored.* returns 0 on success, -ve errno on failure.
isolate_huge_page
get_ksm_page	get_ksm_page: checks if the page indicated by the stable node* is still its ksm page, despite having held no reference to it.* In which case we can trust the content of the page, and it* returns the gotten page; but if the page has now been zapped,
isolate_movable_page
__migration_entry_wait	Something used the pte of a page under migration. We need to* get to the page and wait until migration is finished.* When we return from this function the fault will be retried.
do_huge_pmd_numa_page	NUMA hinting page fault entry point for trans huge pmds
deferred_split_scan
mc_handle_present_pte
get_hwpoison_page	get_hwpoison_page() - Get refcount for memory error handling:@page: raw error page (hit by memory error) Return: return 0 if failed to grab the refcount, otherwise true (some* non-zero value.)
page_idle_get_page	Idle page tracking only considers user memory pages, for other types of* pages the idle flag is always unset and an attempt to set it is silently* ignored

函数逻辑报告