xas_nomem

函数名称：xas_nomem() - Allocate memory if needed.*@xas: XArray operation state.*@gfp: Memory allocation flags.* If we need to add new nodes to the XArray, we try to allocate memory* with GFP_NOWAIT while holding the lock, which will usually succeed.

函数原型：bool xas_nomem(struct xa_state *xas, gfp_t gfp)

返回类型：bool

参数：

类型	参数	名称
struct xa_state *	xas
gfp_t	gfp

**调用者**
名称	描述
xa_store_range	xa_store_range() - Store this entry at a range of indices in the XArray
ida_alloc_range	da_alloc_range() - Allocate an unused ID.@ida: IDA handle.@min: Lowest ID to allocate.@max: Highest ID to allocate.@gfp: Memory allocation flags.* Allocate an ID between @min and @max, inclusive. The allocated ID will
xa_store_order	If anyone needs this, please move it to xarray.c. We have no current* users outside the test suite because all current multislot users want* to use the advanced API.
check_xas_erase
__check_store_iter
xa_store_many_order
check_create_range_4
check_workingset
add_to_swap_cache	add_to_swap_cache resembles add_to_page_cache_locked on swapper_space,* but sets SwapCache flag and private instead of mapping and index.
__add_to_page_cache_locked
grab_mapping_entry	Find page cache entry at given index. If it is a DAX entry, return it* with the entry locked. If the page cache doesn't contain an entry at* that index, add a locked empty entry.* When requesting an entry with size DAX_PMD, grab_mapping_entry() will

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