如何解决(linux 内核) 在 available_filter_functions 中添加新函数
硬件 - RaspBerry pi 4 Model B 8GB 操作系统 - 树莓派操作系统 Buster(10)(2020-05-27-raspios-buster-full-armhf.img)(linux kerenl 4.19.y)
我在 proc.c 中添加了 rpi_get_interrupt_info() 并修改了 show_interrupts()
rpi_get_interrupt_info() 和 show_interrupts() 的完整代码
void rpi_get_interrupt_info(struct irqaction *action_p)
{
unsigned int irq_num = action_p->irq;
void *irq_handler = NULL;
if (action_p->handler) {
irq_handler = (void*)action_p->handler;
}
if (irq_handler) {
trace_printk("[%s] %d: %s,irq_handler: %pS \n",current->comm,irq_num,action_p->name,irq_handler);
}
}
int show_interrupts(struct seq_file *p,void *v)
{
static int prec;
unsigned long flags,any_count = 0;
int i = *(loff_t *) v,j;
struct irqaction *action;
struct irq_desc *desc;
if (i > ACTUAL_NR_IRQS)
return 0;
if (i == ACTUAL_NR_IRQS)
return arch_show_interrupts(p,prec);
/* print header and calculate the width of the first column */
if (i == 0) {
for (prec = 3,j = 1000; prec < 10 && j <= nr_irqs; ++prec)
j *= 10;
seq_printf(p,"%*s",prec + 8,"");
for_each_online_cpu(j)
seq_printf(p,"cpu%-8d",j);
seq_putc(p,'\n');
}
rcu_read_lock();
desc = irq_to_desc(i);
if (!desc)
goto outsparse;
if (desc->kstat_irqs)
for_each_online_cpu(j)
any_count |= *per_cpu_ptr(desc->kstat_irqs,j);
if ((!desc->action || irq_desc_is_chained(desc)) && !any_count)
goto outsparse;
seq_printf(p,"%*d: ",prec,i);
for_each_online_cpu(j)
seq_printf(p,"%10u ",desc->kstat_irqs ?
*per_cpu_ptr(desc->kstat_irqs,j) : 0);
raw_spin_lock_irqsave(&desc->lock,flags);
if (desc->irq_data.chip) {
if (desc->irq_data.chip->irq_print_chip)
desc->irq_data.chip->irq_print_chip(&desc->irq_data,p);
else if (desc->irq_data.chip->name)
seq_printf(p," %8s",desc->irq_data.chip->name);
else
seq_printf(p,"-");
} else {
seq_printf(p,"None");
}
if (desc->irq_data.domain)
seq_printf(p," %*d",(int) desc->irq_data.hwirq);
else
seq_printf(p," %*s","");
#ifdef CONfig_GENERIC_IRQ_SHOW_LEVEL
seq_printf(p," %-8s",irqd_is_level_type(&desc->irq_data) ? "Level" : "Edge");
#endif
if (desc->name)
seq_printf(p,"-%-8s",desc->name);
action = desc->action;
if (action)
rpi_get_interrupt_info(action);
if (action) {
seq_printf(p," %s",action->name);
while ((action = action->next) != NULL)
seq_printf(p,",%s",action->name);
}
seq_putc(p,'\n');
raw_spin_unlock_irqrestore(&desc->lock,flags);
outsparse:
rcu_read_unlock();
return 0;
}
#endif
我更改的代码
void rpi_get_interrupt_info(struct irqaction *action_p)
{
unsigned int irq_num = action_p->irq;
void *irq_handler = NULL;
if (action_p->handler) {
irq_handler = (void*)action_p->handler;
}
if (irq_handler) {
trace_printk("[%s] %d: %s,irq_handler);
}
}
....
if (action)
rpi_get_interrupt_info(action);
当我尝试 echo rpi_get_interrupt_info > /sys/kernel/debug/tracing/set_ftrace_filter
时,它显示 echo: write error: Invalid argument
所以我查看了/sys/kernel/debug/tracing/available_filter_functions,没有rpi_get_interrupt_info
我试过 noinline void rpi_get_interrupt_info(struct irqaction *action_p)
,但没有用。
解决方法
抱歉,我在配置 bcm2711_defconfig 文件时犯了一些错误。感谢所有想帮助我的人:)
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