函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:lib\test_xarray.c Create Date:2022-07-27 07:31:23
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：See find_swap_entry() in mm/shmem.c

函数原型：static noinline unsigned long xa_find_entry(struct xarray *xa, void *item)

返回类型：unsigned long

参数：

类型参数名称
struct xarray *xa
void *item
1089  XA_STATE() - Declare an XArray operation state.*@name: Name of this operation state (usually xas).*@array: Array to operate on.*@index: Initial index of interest.* Declare and initialise an xa_state on the stack.(xas, xa, 0)
1090  checked等于0
1093  _read_lock() - mark the beginning of an RCU read-side critical section* When synchronize_rcu() is invoked on one CPU while other CPUs* are within RCU read-side critical sections, then the* synchronize_rcu() is guaranteed to block until after all the other
1095  如果xas_retry() - Retry the operation if appropriate.*@xas: XArray operation state.*@entry: Entry from xarray.* The advanced functions may sometimes return an internal entry, such as* a retry entry or a zero entry. This function sets up the @xas to restart则继续下一循环
1097  如果entry恒等于item则退出
1099  checked自加
1100  如果checked取模4不等于0则继续下一循环
1102  xas_pause() - Pause a walk to drop a lock.*@xas: XArray operation state.* Some users need to pause a walk and drop the lock they're holding in* order to yield to a higher priority thread or carry out an operation* on an entry
1104  _read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()
1106  返回:如果entry则xa_index否则负1
调用者
名称描述
check_find_entry