linux-kernel - Re: linux-next: build warning after merge of the net-next tree

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Date:   Fri, 20 Jul 2018 08:09:06 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     David Miller <davem@...emloft.net>,
        Networking <netdev@...r.kernel.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Andrew Lunn <andrew@...n.ch>
Subject: Re: linux-next: build warning after merge of the net-next tree

Hi Guenter,

On Thu, 19 Jul 2018 06:49:01 -0700 Guenter Roeck <linux@...ck-us.net> wrote:
>
> On 07/18/2018 10:29 PM, Stephen Rothwell wrote:
> > 
> > On Wed, 18 Jul 2018 20:52:56 -0700 Guenter Roeck <linux@...ck-us.net> wrote:  
> >>
> >> On 07/18/2018 07:04 PM, Stephen Rothwell wrote:  
> >>>
> >>> After merging the net-next tree, today's linux-next build (x86_64
> >>> allmodconfig) produced this warning:
> >>>
> >>> *
> >>> * Restart config...
> >>> *
> >>> ....
> >>>
> >>> This is output by my "make allmodconfig" and only started after merging
> >>> the net-next tree today.  It has continued for further merges/builds.
> >>>
> >>> I suspect commit
> >>>
> >>>     1323061a018a ("net: phy: sfp: Add HWMON support for module sensors")
> >>>
> >>> which added an "imply" clause.
> >>>      
> >> I thought "imply" was better than "depends on HWMON || HWMON=n", but maybe
> >> not. Is that a caveat when using "imply", and does it mean that "imply"
> >> should better not be used ?  
> > 
> > I don't know, sorry.  It was just my best guess from what I could see
> > had changed.
> > 
> > I wonder if it makes a difference that I am doing my "make
> > allmodconfig" on top of a previous "make allmodconfig" and some symbols
> > are marked as "NEW" (though they are not symbols related to the changes
> > that happened during the net-next tree merge)?
> >   
> 
> I tried to reproduce the problem, but I don't see the message.
> 
> What I do see, though, is that "make allmodconfig" on a clean tree,
> followed by "make menuconfig", results in configuration changes.
> Specifically,
> 
>  > CONFIG_ARC_EMAC_CORE=m
>  > CONFIG_ARC_EMAC=m
>  > CONFIG_EMAC_ROCKCHIP=m  
> 
> is removed by menuconfig, and a large number of "# ... is not set"
> configuration lines are added. Weird and bad, since several of the
> disabled configurations _should_ be enabled by "make allmodconfig",
> and a large number of hwmon drivers are affected. Bisect does point
> to "net: phy: sfp: Add HWMON support for module sensors", meaning
> "imply hwmon" does have severe side effects and can not be used.
> 
> I'll try to find a fix.

OK, my mistake, the "make allmodconfig" works, the following "make"
causes the config restart.  (I am actually doing cross builds and using
an external object directory, in case that matters.)

I removed the "imply HWMON" line added by the above commit and the
problem went away.  Also, using "depends on HWMON || HWMON=n" instead
of the imply fixes it.
-- 
Cheers,
Stephen Rothwell

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