linux-kernel - Re: [RFC 0/6] Regressions for "imply" behavior change

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Message-ID: <CAK8P3a1PjP9_b5NdmqTLeGN4y+3JXx_yyTE8YAf1u5rYHWPA9g@mail.gmail.com>
Date:   Tue, 14 Apr 2020 17:25:39 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Saeed Mahameed <saeedm@...lanox.com>,
        "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>,
        "leon@...nel.org" <leon@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "nico@...xnic.net" <nico@...xnic.net>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        "kieran.bingham+renesas@...asonboard.com" 
        <kieran.bingham+renesas@...asonboard.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "jani.nikula@...ux.intel.com" <jani.nikula@...ux.intel.com>,
        "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 Tue, Apr 14, 2020 at 5:23 PM Jason Gunthorpe <jgg@...pe.ca> wrote:
>
> On Tue, Apr 14, 2020 at 04:27:41PM +0200, Arnd Bergmann wrote:
> > On Tue, Apr 14, 2020 at 3:29 PM Jason Gunthorpe <jgg@...pe.ca> wrote:
> > > On Fri, Apr 10, 2020 at 07:04:27PM +0000, Saeed Mahameed wrote:
> > which in turn leads to mlx5_core.ko *not* containing mlx5_vxlan.o,
> > and in turn causing that link error against
> > mlx5_vxlan_create/mlx5_vxlan_destroy, unless the IS_ENABLED()
> > is changed to IS_REACHABLE().
>
> What about the reverse if mlx5_core is 'm' and VLXAN is 'y'?
>
>  mlx5_core-m := mlx5_core.o
>  mlx5_core-y += mlx5_vxlan.o
>
> Magically works out?

Yes, Kbuild takes care of that case.

> > > IIRC that isn't what the expression does, if vxlan is 'n' then
> > >   n || !n == true
> >
> > It forces MLX5_CORE to 'm' or 'n' but not 'y' if VXLAN=m,
> > but allows any option if VXLAN=y
>
> And any option if VXLAN=n ?

Correct.

      Arnd