From: Christoph Hellwig <hch@infradead.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Dave Chinner <david@fromorbit.com>,
Bart Van Assche <bvanassche@acm.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
linux-fsdevel@vger.kernel.org,
Johannes Berg <johannes.berg@intel.com>,
Ingo Molnar <mingo@redhat.com>, Theodore Ts'o <tytso@mit.edu>
Subject: Re: [PATCH RFC] kernel/locking, fs/direct-io: Introduce and use down_write_nolockdep()
Date: Sun, 28 Oct 2018 13:34:47 -0700 [thread overview]
Message-ID: <20181028203447.GA9330@infradead.org> (raw)
In-Reply-To: <20181028175840.GA744@hirez.programming.kicks-ass.net>
On Sun, Oct 28, 2018 at 06:58:40PM +0100, Peter Zijlstra wrote:
> Also, from a quick look, this has been broken for donkeys years,
> right? That comment:
>
> /* will be released by direct_io_worker */
>
> has been there since 2009. Back then of course it was a mutex, and the
> curious thing is, mutexes have _never_ supported this release from
> another context thing.
direct_io_worker back then was just a helper called by
__blockdev_direct_IO in the same context. But yes, this comment
is horribly out of date.
next prev parent reply other threads:[~2018-10-29 5:20 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-26 16:49 [PATCH RFC] kernel/locking, fs/direct-io: Introduce and use down_write_nolockdep() Bart Van Assche
2018-10-26 17:43 ` Matthew Wilcox
2018-10-26 18:11 ` Bart Van Assche
2018-10-26 18:38 ` Matthew Wilcox
2018-10-26 19:12 ` Bart Van Assche
2018-10-27 5:37 ` Dave Chinner
2018-10-28 17:58 ` Peter Zijlstra
2018-10-28 20:34 ` Christoph Hellwig [this message]
2018-10-28 20:45 ` Bart Van Assche
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