函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:arch\x86\kernel\cpu\cpuid-deps.c Create Date:2022-07-27 08:57:02
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：do_clear_cpu_cap

函数原型：static void do_clear_cpu_cap(struct cpuinfo_x86 *c, unsigned int feature)

返回类型：void

参数：

类型参数名称
struct cpuinfo_x86 *c
unsigned intfeature
95  DECLARE_BITMAP(disable, Take the capabilities and the BUG bits into account )
99  如果WARN_ON(feature >= Take the capabilities and the BUG bits into account )则返回
102  clear_feature(c, feature)
105  memset(disable, 0, disable的长度)
106  __set_bit - Set a bit in memory*@nr: the bit to set*@addr: the address to start counting from* Unlike set_bit(), this function is non-atomic. If it is called on the same* region of memory concurrently, the effect may be that only one operation* succeeds.
109  循环
110  changed = false
111  以feature循环
112  如果非st_bit - Determine whether a bit is set*@nr: bit number to test*@addr: Address to start counting from则继续下一循环
114  如果__test_and_set_bit - Set a bit and return its old value*@nr: Bit to set*@addr: Address to count from* This operation is non-atomic. If two instances of this operation race, one* can appear to succeed but actually fail.则继续下一循环
117  changed = true
118  clear_feature(c, feature)
120  当changed循环
调用者
名称描述
clear_cpu_cap
setup_clear_cpu_cap