From: Dave Chinner <david@fromorbit.com>
To: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>, Will Deacon <will@kernel.org>,
Waiman Long <longman@redhat.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Chandan Babu R <chandan.babu@oracle.com>,
"Darrick J . Wong" <djwong@kernel.org>,
linux-xfs@vger.kernel.org, Mateusz Guzik <mjguzik@gmail.com>
Subject: Re: [PATCH v2 1/5] locking: Add rwsem_assert_held() and rwsem_assert_held_write()
Date: Mon, 9 Oct 2023 08:54:28 +1100 [thread overview]
Message-ID: <ZSMlFMTuD/5B1U/n@dread.disaster.area> (raw)
In-Reply-To: <20231007203543.1377452-2-willy@infradead.org>
On Sat, Oct 07, 2023 at 09:35:39PM +0100, Matthew Wilcox (Oracle) wrote:
> Modelled after lockdep_assert_held() and lockdep_assert_held_write(),
> but are always active, even when lockdep is disabled. Of course, they
> don't test that _this_ thread is the owner, but it's sufficient to catch
> many bugs and doesn't incur the same performance penalty as lockdep.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
> ---
.....
> @@ -169,6 +189,18 @@ static __always_inline int rwsem_is_contended(struct rw_semaphore *sem)
> * the RT specific variant.
> */
>
> +static inline void rwsem_assert_held(const struct rw_semaphore *sem)
> +{
> + lockdep_assert_held(sem);
> + __rwsem_assert_held(sem);
> +}
if (IS_ENABLED(CONFIG_LOCKDEP))
lockdep_assert_held(sem);
else
__rwsem_assert_held(sem);
-Dave.
--
Dave Chinner
david@fromorbit.com
next prev parent reply other threads:[~2023-10-08 21:54 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-07 20:35 [PATCH v2 0/5] Remove the XFS mrlock Matthew Wilcox (Oracle)
2023-10-07 20:35 ` [PATCH v2 1/5] locking: Add rwsem_assert_held() and rwsem_assert_held_write() Matthew Wilcox (Oracle)
2023-10-08 21:54 ` Dave Chinner [this message]
2023-10-07 20:35 ` [PATCH v2 2/5] mm: Use rwsem assertion macros for mmap_lock Matthew Wilcox (Oracle)
2023-10-07 20:35 ` [PATCH v2 3/5] xfs: Replace xfs_isilocked with xfs_assert_locked Matthew Wilcox (Oracle)
2023-10-08 21:59 ` Dave Chinner
2023-10-09 18:27 ` Darrick J. Wong
2023-10-07 20:35 ` [PATCH v2 4/5] xfs: Remove mrlock wrapper Matthew Wilcox (Oracle)
2023-10-08 22:17 ` Dave Chinner
2023-10-07 20:35 ` [PATCH v2 5/5] fs: Add inode_assert_locked() and inode_assert_locked_excl() Matthew Wilcox (Oracle)
2023-10-08 20:26 ` Mateusz Guzik
2023-10-08 21:05 ` Matthew Wilcox
2023-10-08 21:21 ` Mateusz Guzik
2023-10-08 20:31 ` [PATCH v2 0/5] Remove the XFS mrlock Mateusz Guzik
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