is_free_buddy_page

Name:is_free_buddy_page

Proto:bool is_free_buddy_page(struct page *page)

Type:bool

Parameter:

Type	Parameter	Name
struct page *	page

8703

zone = page_zone(page)

8704

pfn = page_to_pfn(page)

8708

spin_lock_irqsave( & Primarily protects free_area , flags)

8709

When order < Free memory management - zoned buddy allocator. cycle

8710

page_head = page - (pfn & (1 << order) - 1 )

8712

If PageBuddy() indicates that the page is free and in the buddy system* (see mm/page_alloc.c). && page_order(page_head) >= order Then Break

8715

spin_unlock_irqrestore( & Primarily protects free_area , flags)

8717

Return order < Free memory management - zoned buddy allocator.

**Caller**
Name	Describe
shake_page	When a unknown page type is encountered drain as many buffers as possible* in the hope to turn the page into a LRU or free page, which we can handle.
memory_failure	memory_failure - Handle memory failure of a page.@pfn: Page Number of the corrupted page@flags: fine tune action taken* This function is called by the low level machine check code* of an architecture when it detects hardware memory corruption* of a page
__get_any_page	Safely get reference count of an arbitrary page.* Returns 0 for a free page, -EIO for a zero refcount page* that is not free, and 1 for any other page type.* For 1 the page is returned with increased page count, otherwise not.

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