linux-kernel - Re: [RFC PATCH 0/1] Initialize debugfs/ksysfs earlier?

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Date:   Fri, 4 Jun 2021 14:56:51 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Adrian Ratiu <adrian.ratiu@...labora.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kernel@...labora.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/1] Initialize debugfs/ksysfs earlier?

On Thu, Jun 03, 2021 at 11:00:00PM +0300, Adrian Ratiu wrote:
> Hi and thank you for the quick response!
> 
> On Thu, 03 Jun 2021, Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:
> > On Thu, Jun 03, 2021 at 03:55:33PM +0300, Adrian Ratiu wrote:
> > > Hi Greg & all,  I would like to add a new debugfs file like in the
> > > next patch but I'm having a problem with commit 56348560d495
> > > ("debugfs: do not attempt to create a new file before the filesystem
> > > is initalized").
> > 
> > You should have had a problem before that commit happened as well,
> > right?
> > 
> 
> Actually no, it works without problems before commit 56348560d495 and also
> works if I revert that commit or move the debugfs_init() and its dependency
> ksysfs_init() before the driver core init.

And the file shows up properly?  How can that be?  Is it ok to create a
file before the superblock is created in the system?  For some reason I
thought these were just silently failing and no one noticed.  Maybe we
should revisit that commit...

thanks,

greg k-h