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Date:   Wed, 8 Apr 2020 20:46:42 +0000
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "nico@...xnic.net" <nico@...xnic.net>,
        "arnd@...db.de" <arnd@...db.de>
CC:     "narmstrong@...libre.com" <narmstrong@...libre.com>,
        "masahiroy@...nel.org" <masahiroy@...nel.org>,
        "Laurent.pinchart@...asonboard.com" 
        <Laurent.pinchart@...asonboard.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "kieran.bingham+renesas@...asonboard.com" 
        <kieran.bingham+renesas@...asonboard.com>,
        "leon@...nel.org" <leon@...nel.org>,
        "a.hajda@...sung.com" <a.hajda@...sung.com>,
        "jonas@...boo.se" <jonas@...boo.se>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "jernej.skrabec@...l.net" <jernej.skrabec@...l.net>
Subject: Re: [RFC 0/6] Regressions for "imply" behavior change

On Wed, 2020-04-08 at 16:38 -0400, Nicolas Pitre wrote:
> On Wed, 8 Apr 2020, Arnd Bergmann wrote:
> 
> > Hi everyone,
> > 
> > I've just restarted doing randconfig builds on top of mainline
> > Linux and
> > found a couple of regressions with missing dependency from the
> > recent
> > change in the "imply" keyword in Kconfig, presumably these two
> > patches:
> > 
> > 3a9dd3ecb207 kconfig: make 'imply' obey the direct dependency
> > def2fbffe62c kconfig: allow symbols implied by y to become m
> > 
> > I have created workarounds for the Kconfig files, which now stop
> > using
> > imply and do something else in each case. I don't know whether
> > there was
> > a bug in the kconfig changes that has led to allowing
> > configurations that
> > were not meant to be legal even with the new semantics, or if the
> > Kconfig
> > files have simply become incorrect now and the tool works as
> > expected.
> 
> In most cases it is the code that has to be fixed. It typically does:
> 
> 	if (IS_ENABLED(CONFIG_FOO))
> 		foo_init();
> 
> Where it should rather do:
> 
> 	if (IS_REACHABLE(CONFIG_FOO))
> 		foo_init();
> 
> A couple of such patches have been produced and queued in their 
> respective trees already.
> 
> 

Yes i have a patch in mlx5-net branch converting IS_ENABLED to
IS_REACHABLE in mlx5, i will post it today.

Thanks,
Saeed.

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