page_is_buddy

函数名称：This function checks whether a page is free && is the buddy* we can coalesce a page and its buddy if* (a) the buddy is not in a hole (check before calling!) &&* (b) the buddy is in the buddy system &&* (c) a page and its buddy have the same order &&

函数原型：static inline int page_is_buddy(struct page *page, struct page *buddy, unsigned int order)

返回类型：int

参数：

类型	参数	名称
struct page *	page
struct page *	buddy
unsigned int	order

797

如果page_is_guard(buddy)且page_order(buddy)恒等于order则

798

如果The identification function is mainly used by the buddy allocator for* determining if two pages could be buddies不等于The identification function is mainly used by the buddy allocator for* determining if two pages could be buddies则返回:0

801

VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy)

803

返回:1

806

如果PageBuddy() indicates that the page is free and in the buddy system* (see mm/page_alloc.c).且page_order(buddy)恒等于order则

812

815

VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy)

817

返回:1

819

返回:0

**调用者**
名称	描述
__free_one_page	Freeing function for a buddy system allocator

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码

函数逻辑报告