From: Byungchul Park <byungchul.park@lge.com>
To: Bart Van Assche <Bart.VanAssche@wdc.com>
Cc: "mingo@kernel.org" <mingo@kernel.org>,
"peterz@infradead.org" <peterz@infradead.org>,
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Subject: Re: [RESEND PATCH 1/3] completion: Add support for initializing completion with lockdep_map
Date: Fri, 20 Oct 2017 15:14:06 +0900 [thread overview]
Message-ID: <20171020061406.GF3310@X58A-UD3R> (raw)
In-Reply-To: <1508455438.4542.4.camel@wdc.com>
On Thu, Oct 19, 2017 at 11:24:00PM +0000, Bart Van Assche wrote:
> Are there any completion objects for which the cross-release checking is
> useful? Are there any wait_for_completion() callers that hold a mutex or
> other locking object?
Check /proc/lockdep, then you can find all dependencies wrt cross-lock.
I named a lock class of wait_for_completion(), a sting starting with
"(complete)".
For example, in my machine:
console_lock -> (complete)&req.done
cpu_hotplug_lock.rw_sem -> (complete)&st->done_up
cpuhp_state_mutex -> (complete)&st->done_up
and so on.
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next prev parent reply other threads:[~2017-10-20 6:14 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-18 9:38 Fix false positive by LOCKDEP_CROSSRELEASE Byungchul Park
2017-10-18 9:38 ` [RESEND PATCH 1/3] completion: Add support for initializing completion with lockdep_map Byungchul Park
2017-10-19 23:24 ` Bart Van Assche
2017-10-20 6:14 ` Byungchul Park [this message]
2017-10-20 6:34 ` Thomas Gleixner
2017-10-20 19:58 ` Bart Van Assche
2017-10-21 2:23 ` Byungchul Park
2017-10-22 14:34 ` Bart Van Assche
2017-10-23 2:08 ` Byungchul Park
2017-10-25 7:07 ` Bart Van Assche
2017-10-25 11:49 ` Byungchul Park
2017-10-18 9:38 ` [RESEND PATCH 2/3] lockdep: Remove unnecessary acquisitions wrt workqueue flush Byungchul Park
2017-10-18 9:38 ` [RESEND PATCH 3/3] lockdep: Assign a lock_class per gendisk used for wait_for_completion() Byungchul Park
2017-10-18 9:59 ` Ingo Molnar
2017-10-19 1:57 ` Byungchul Park
2017-10-18 14:29 ` Fix false positive by LOCKDEP_CROSSRELEASE Bart Van Assche
2017-10-19 1:57 ` Byungchul Park
2017-10-19 14:52 ` Bart Van Assche
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