linux-kernel - Re: [PATCH 5.15 000/251] 5.15.47-rc2 review

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Date:   Wed, 15 Jun 2022 11:00:26 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Jan Kara <jack@...e.cz>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Backlund <tmb@....nu>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>, patches@...nelci.org,
        lkft-triage@...ts.linaro.org, Pavel Machek <pavel@...x.de>,
        Jon Hunter <jonathanh@...dia.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        Slade Watkins <slade@...dewatkins.com>
Subject: Re: [PATCH 5.15 000/251] 5.15.47-rc2 review

On Wed, Jun 15, 2022 at 03:38:45PM +0200, Jan Kara wrote:
> On Wed 15-06-22 13:00:22, Jan Kara wrote:
> > On Tue 14-06-22 12:00:22, Linus Torvalds wrote:
> > > On Tue, Jun 14, 2022 at 11:51 AM Linus Torvalds
> > > <torvalds@...ux-foundation.org> wrote:
> > > >
> > > > Or just make sure that noop_backing_dev_info is fully initialized
> > > > before it's used.
> > > 
> > > I don't see any real reason why that
> > > 
> > >     err = bdi_init(&noop_backing_dev_info);
> > > 
> > > couldn't just be done very early. Maybe as the first call in
> > > driver_init(), before the whole devtmpfs_init() etc.
> > 
> > I've checked the dependencies and cgroups (which are the only non-trivial
> > dependency besides per-CPU infrastructure) are initialized early enough so
> > it should work fine. So let's try that.
> 
> Attached patch boots for me. Guys, who was able to reproduce the failure: Can
> you please confirm this patch fixes your problem?
> 

It does for me.

> 								Honza
> -- 
> Jan Kara <jack@...e.com>
> SUSE Labs, CR

> From 8f998b182be7563fc92aa8914cc7d21f75a3c20e Mon Sep 17 00:00:00 2001
> From: Jan Kara <jack@...e.cz>
> Date: Wed, 15 Jun 2022 15:22:29 +0200
> Subject: [PATCH] init: Initialized noop_backing_dev_info early
> 
> noop_backing_dev_info is used by superblocks of various
> pseudofilesystems such as kdevtmpfs. Initialize it before the
> filesystems get mounted.
> 
> Signed-off-by: Jan Kara <jack@...e.cz>

Tested-by: Guenter Roeck <linux@...ck-us.net>

Guenter