Re: [PATCH v4 07/15] lockdep: Implement crossrelease feature

Lai Jiangshan
2017-01-13T04:39:06Z

> +
> +/*
> + * No contention. Irq disable is only required.
> + */
> +static int same_context_plock(struct pend_lock *plock)
> +{
> + struct task_struct *curr = current;
> + int cpu = smp_processor_id();
> +
> + /* In the case of hardirq context */
> + if (curr->hardirq_context) {
> + if (plock->hardirq_id != per_cpu(hardirq_id, cpu) ||
> + plock->hardirq_context != curr->hardirq_context)
> + return 0;
> + /* In the case of softriq context */
> + } else if (curr->softirq_context) {
> + if (plock->softirq_id != per_cpu(softirq_id, cpu) ||
> + plock->softirq_context != curr->softirq_context)
> + return 0;
> + /* In the case of process context */
> + } else {
> + if (plock->hardirq_context != 0 ||
> + plock->softirq_context != 0)
> + return 0;
> + }
> + return 1;
> +}
>

I have not read the code yet...
but different work functions in workqueues are different "contexts" IMO,
does commit operation work well in work functions?