linux-kernel - Re: [PATCH v3 1/4] locking: Add rwsem_assert_held() and rwsem_assert_held

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Date:   Mon, 13 Nov 2023 09:24:27 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Chandan Babu R <chandan.babu@...cle.com>,
        "Darrick J . Wong" <djwong@...nel.org>, linux-xfs@...r.kernel.org,
        Mateusz Guzik <mjguzik@...il.com>
Subject: Re: [PATCH v3 1/4] locking: Add rwsem_assert_held() and
 rwsem_assert_held_write()

On Fri, Nov 10, 2023 at 08:41:16PM +0000, Matthew Wilcox (Oracle) wrote:

> +static inline void rwsem_assert_held_nolockdep(const struct rw_semaphore *sem)
> +{
> +	WARN_ON(atomic_long_read(&sem->count) == RWSEM_UNLOCKED_VALUE);
> +}
> +
> +static inline void rwsem_assert_held_write_nolockdep(const struct rw_semaphore *sem)
> +{
> +	WARN_ON(!(atomic_long_read(&sem->count) & RWSEM_WRITER_LOCKED));
> +}

> +static inline void rwsem_assert_held_nolockdep(const struct rw_semaphore *sem)
> +{
> +	BUG_ON(!rwsem_is_locked(sem));
> +}

What's with the WARN_ON() vs BUG_ON() thing?