函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\sparse.c Create Date:2022-07-27 17:07:47
Last Modify:2020-03-17 22:36:03 Copyright©Brick
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函数名称：sparse_buffer_alloc

函数原型：void *__meminit sparse_buffer_alloc(unsigned long size)

返回类型：void

参数：

类型参数名称
unsigned longsize
505  void * ptr = NULL
507  如果sparsemap_buf则
508  ptr等于undup - round up to the next specified multiple*@x: the value to up*@y: multiple to round up to* Rounds @x up to next multiple of @y. If @y will always be a power* of 2, consider using the faster round_up().((unsignedlong)sparsemap_buf, size)
509  如果ptr加size大于sparsemap_buf_end则ptr = NULL
511  否则
513  如果ptr减sparsemap_buf大于0则sparse_buffer_free((unsignedlong)(ptr - sparsemap_buf))
515  sparsemap_buf等于ptr加size
518  返回:ptr
调用者
名称描述
vmemmap_alloc_block_bufd to make sure size is all the same during early stage