linux-kernel - Re: [PATCH 07/11] xfs: remove not needed freezing calls

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Date:   Fri, 01 Dec 2017 00:40:31 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Dave Chinner <david@...morbit.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>, Jan Kara <jack@...e.cz>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Al Viro <viro@...iv.linux.org.uk>, bart.vanassche@....com,
        ming.lei@...hat.com, Ted Ts'o <tytso@....edu>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Jiri Kosina <jikos@...nel.org>, Pavel Machek <pavel@....cz>,
        Len Brown <len.brown@...el.com>, linux-fsdevel@...r.kernel.org,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Todd Brandt <todd.e.brandt@...ux.intel.com>, nborisov@...e.com,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Oliver Neukum <ONeukum@...e.com>, oleksandr@...alenko.name,
        Oleg Antonyan <oleg.b.antonyan@...il.com>,
        Yu Chen <yu.chen.surf@...il.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Linux PM <linux-pm@...r.kernel.org>,
        linux-block@...r.kernel.org, linux-xfs@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 07/11] xfs: remove not needed freezing calls

On Friday, December 1, 2017 12:30:33 AM CET Dave Chinner wrote:
> On Thu, Nov 30, 2017 at 09:32:53PM +0100, Rafael J. Wysocki wrote:
> > On Thu, Nov 30, 2017 at 5:21 PM, Jan Kara <jack@...e.cz> wrote:
> > > On Wed 29-11-17 15:23:52, Luis R. Rodriguez wrote:
> > >> This removes superflous freezer calls as they are no longer needed
> > >> as the VFS now performs filesystem freezing/thaw if the filesystem has
> > >> support for it.
> > >>
> > >> The following Coccinelle rule was used as follows:
> > >>
> > >> spatch --sp-file fs-freeze-cleanup.cocci --in-place fs/$FS/
> > >
> > > I think your rule misses WQ_FREEZABLE flag for workqueues? That would be
> > > also good to get rid of...
> > 
> > We need that one (or equivalent) for the runtime PM workqueue at least.
> 
> I think Jan was talking about all the WQ_FREEZABLE flags in
> filesystem workqueues (such as all the XFS wqs) that are no longer
> necessary once filesystems are frozen appropriately.

I see, thanks.  That was unclear to me, sorry for the confusion.

Thanks,
Rafael