From: Herbert Xu <herbert@gondor.apana.org.au>
To: Tejun Heo <tj@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>
Cc: marcan@marcan.st, will@kernel.org, peterz@infradead.org,
jirislaby@kernel.org, maz@kernel.org, mark.rutland@arm.com,
boqun.feng@gmail.com, catalin.marinas@arm.com, oneukum@suse.com,
roman.penyaev@profitbricks.com, asahi@lists.linux.dev,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: Re: [PATCH] workqueue: Fix memory ordering race in queue_work*()
Date: Tue, 16 Aug 2022 12:15:38 +0800 [thread overview]
Message-ID: <YvsZ6vObgLaDeSZk@gondor.apana.org.au> (raw)
In-Reply-To: <YvqaK3hxix9AaQBO@slm.duckdns.org>
Tejun Heo <tj@kernel.org> wrote:
>
> Oh, tricky one and yeah you're absolutely right that it makes no sense to
> not guarantee barrier semantics when already pending. I didn't even know
> test_and_set_bit() wasn't a barrier when it failed. Thanks a lot for hunting
> down and fixing this. Applied to wq/for-6.0-fixes.
Please revert this as test_and_set_bit was always supposed to be
a full memory barrier. This is an arch bug.
Cheers,
--
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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next prev parent reply other threads:[~2022-08-16 4:17 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-15 17:58 [PATCH] workqueue: Fix memory ordering race in queue_work*() Hector Martin
2022-08-15 19:10 ` Tejun Heo
2022-08-16 4:15 ` Herbert Xu [this message]
2022-08-16 5:27 ` Linus Torvalds
2022-08-16 5:36 ` Hector Martin
2022-08-16 5:52 ` Linus Torvalds
2022-08-16 6:28 ` Hector Martin
2022-08-16 7:48 ` Herbert Xu
2022-08-16 8:01 ` Hector Martin
2022-08-16 5:48 ` Herbert Xu
2022-08-16 6:03 ` Linus Torvalds
2022-08-16 13:41 ` Will Deacon
2022-08-16 14:55 ` Boqun Feng
2022-08-16 16:22 ` Hector Martin
2022-08-16 16:43 ` Boqun Feng
2022-08-16 16:58 ` Linus Torvalds
2022-08-16 16:41 ` Linus Torvalds
2022-08-17 5:05 ` Herbert Xu
2022-08-16 17:01 ` Tejun Heo
2022-08-16 16:26 ` Tejun Heo
2022-08-16 17:21 ` Hector Martin
2022-08-16 4:14 ` Herbert Xu
2022-08-16 5:37 ` Hector Martin
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