linux-kernel - Re: [PATCH v6 05/15] lockdep: Implement crossrelease feature

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Date:   Wed, 19 Apr 2017 17:08:35 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Byungchul Park <byungchul.park@....com>
Cc:     mingo@...nel.org, tglx@...utronix.de, walken@...gle.com,
        boqun.feng@...il.com, kirill@...temov.name,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        iamjoonsoo.kim@....com, akpm@...ux-foundation.org,
        willy@...radead.org, npiggin@...il.com, kernel-team@....com
Subject: Re: [PATCH v6 05/15] lockdep: Implement crossrelease feature

On Tue, Mar 14, 2017 at 05:18:52PM +0900, Byungchul Park wrote:
> +/*
> + * Only access local task's data, so irq disable is only required.
> + */
> +static int same_context_xhlock(struct hist_lock *xhlock)
> +{
> +	struct task_struct *curr = current;
> +
> +	/* In the case of hardirq context */
> +	if (curr->hardirq_context) {
> +		if (xhlock->hlock.irq_context & 2) /* 2: bitmask for hardirq */
> +			return 1;
> +	/* In the case of softriq context */
> +	} else if (curr->softirq_context) {
> +		if (xhlock->hlock.irq_context & 1) /* 1: bitmask for softirq */
> +			return 1;
> +	/* In the case of process context */
> +	} else {
> +		if (xhlock->work_id == curr->work_id)
> +			return 1;
> +	}
> +	return 0;
> +}

static bool same_context_xhlock(struct hist_lock *xhlock)
{
	return xhlock->hlock.irq_context == task_irq_context(current) &&
	       xhlock->work_id == current->work_id;
}