linux-kernel - Re: [PATCH 1/2] lockdep: add lockdep_assert_not

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Date:   Sun, 14 Feb 2021 18:53:01 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Shuah Khan <skhan@...uxfoundation.org>
Cc:     mingo@...hat.com, will@...nel.org, kvalo@...eaurora.org,
        davem@...emloft.net, kuba@...nel.org, ath10k@...ts.infradead.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] lockdep: add lockdep_assert_not_held()

On Fri, Feb 12, 2021 at 04:28:42PM -0700, Shuah Khan wrote:

> +#define lockdep_assert_not_held(l)	do {			\
> +		WARN_ON(debug_locks && lockdep_is_held(l));	\
> +	} while (0)
> +

This thing isn't as straight forward as you might think, but it'll
mostly work.

Notably this thing will misfire when lockdep_off() is employed. It
certainyl needs a comment to explain the subtleties.