From: Mohamed Khalfella <mkhalfella@purestorage.com>
To: Chaitanya Kulkarni <kch@nvidia.com>,
Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
Keith Busch <kbusch@kernel.org>, Sagi Grimberg <sagi@grimberg.me>
Cc: Casey Chen <cachen@purestorage.com>,
Yuanyuan Zhong <yzhong@purestorage.com>,
Hannes Reinecke <hare@suse.de>, Ming Lei <ming.lei@redhat.com>,
Waiman Long <llong@redhat.com>, Hillf Danton <hdanton@sina.com>,
linux-nvme@lists.infradead.org, linux-block@vger.kernel.org,
linux-kernel@vger.kernel.org,
Mohamed Khalfella <mkhalfella@purestorage.com>
Subject: [PATCH 0/1] Use RCU in blk_mq_[un]quiesce_tagset() instead of set->tag_list_lock
Date: Thu, 4 Dec 2025 10:11:52 -0800 [thread overview]
Message-ID: <20251204181212.1484066-1-mkhalfella@purestorage.com> (raw)
The patch in v2 converted set->tag_list_lock to a rwsemaphore. It was
pointed out this could result in a different kind of deadlock. This
patch uses RCU to protect set->tag_list when accessed from [un]quiesce
code.
v2 - https://lore.kernel.org/all/20251117202414.4071380-1-mkhalfella@purestorage.com/
Mohamed Khalfella (1):
block: Use RCU in blk_mq_[un]quiesce_tagset() instead of
set->tag_list_lock
block/blk-mq.c | 18 ++++++++++--------
1 file changed, 10 insertions(+), 8 deletions(-)
--
2.51.2
next reply other threads:[~2025-12-04 18:12 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-04 18:11 Mohamed Khalfella [this message]
2025-12-04 18:11 ` [PATCH 1/1] block: Use RCU in blk_mq_[un]quiesce_tagset() instead of set->tag_list_lock Mohamed Khalfella
2025-12-04 18:22 ` Bart Van Assche
2025-12-04 18:42 ` Mohamed Khalfella
2025-12-04 19:06 ` Bart Van Assche
2025-12-04 19:15 ` Mohamed Khalfella
2025-12-04 19:31 ` Bart Van Assche
2025-12-04 19:57 ` Mohamed Khalfella
2025-12-04 20:24 ` Bart Van Assche
2025-12-04 21:26 ` Keith Busch
2025-12-04 23:22 ` Bart Van Assche
2025-12-05 1:32 ` Keith Busch
2025-12-05 2:52 ` Bart Van Assche
2025-12-05 16:39 ` Mohamed Khalfella
2025-12-05 18:11 ` Keith Busch
2025-12-08 19:22 ` Bart Van Assche
2025-12-04 19:02 ` Mohamed Khalfella
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