函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\cma_debug.c Create Date:2022-07-27 18:08:11
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：cma_maxchunk_get

函数原型：static int cma_maxchunk_get(void *data, u64 *val)

返回类型：int

参数：

类型参数名称
void *data
u64 *val
51  cma等于data
52  maxchunk等于0
53  end等于0
54  bitmap_maxno等于cma_bitmap_maxno(cma)
56  mutex_lock( & lock)
57  循环
58  start等于在内存区域中查找下一个零位
59  如果start大于等于bitmap_maxno则退出
61  end等于在内存区域中找到下一个设置位
62  maxchunk等于两数取大(end - start, maxchunk)
64  mutex_unlock - release the mutex*@lock: the mutex to be released* Unlock a mutex that has been locked by this task previously.* This function must not be used in interrupt context. Unlocking* of a not locked mutex is not allowed.
65  val等于maxchunk左移 Order of pages represented by one bit 位
67  返回:0