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

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Message-ID: <CAJhGHyBDBUfqeihNMui2doQPet4q8XsORT-t+mQ2F0ang8sn5g@mail.gmail.com>
Date:   Fri, 13 Jan 2017 12:39:04 +0800
From:   Lai Jiangshan <jiangshanlai+lkml@...il.com>
To:     Byungchul Park <byungchul.park@....com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>, walken@...gle.com,
        Boqun Feng <boqun.feng@...il.com>, kirill@...temov.name,
        LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
        iamjoonsoo.kim@....com, akpm@...ux-foundation.org,
        npiggin@...il.com
Subject: Re: [PATCH v4 07/15] lockdep: Implement crossrelease feature

> +
> +/*
> + * 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?