函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\dma\debug.c Create Date:2022-07-27 11:34:39
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：struct dma_entry allocator* The next two functions implement the allocator for* struct dma_debug_entries.

函数原型：static struct dma_debug_entry *dma_entry_alloc(void)

返回类型：struct dma_debug_entry

参数：无

678  spin_lock_irqsave( & Lock for the list above , flags)
679  如果num_free_entries恒等于0则
680  如果dma_debug_create_entries(DOC: Useful GFP flag combinations* Useful GFP flag combinations* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~* Useful GFP flag combinations that are commonly used. It is recommended* that subsystems start with one of these combinations and then set/clear)则
681  Global disable flag - will be set in case of an error = true
682  spin_unlock_irqrestore( & Lock for the list above , flags)
683  打印错误信息("debugging out of memory - disabling\n")
684  返回:NULL
686  __dma_entry_alloc_check_leak()
689  entry等于__dma_entry_alloc()
691  spin_unlock_irqrestore( & Lock for the list above , flags)
694  stack_len等于stack_trace_save(stack_entries, ARRAY_SIZE - get the number of elements in array @arr*@arr: array to be sized(stack_entries), 1)
698  返回:entry
调用者
名称描述
debug_dma_map_page
debug_dma_map_sg
debug_dma_alloc_coherent
debug_dma_map_resource