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Date:   Tue, 14 Apr 2020 15:23:49 +0300
From:   Leon Romanovsky <leon@kernel.org>
To:     Borislav Petkov <bp@alien8.de>
Cc:     David Miller <davem@davemloft.net>, kuba@kernel.org,
        thomas.lendacky@amd.com, keyur@os.amperecomputing.com,
        pcnet32@frontier.com, vfalico@gmail.com, j.vosburgh@gmail.com,
        linux-acenic@sunsite.dk, mripard@kernel.org, heiko@sntech.de,
        mark.einon@gmail.com, chris.snook@gmail.com,
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        quan@os.amperecomputing.com, jcliburn@gmail.com,
        LinoSanfilippo@gmx.de, linux-arm-kernel@lists.infradead.org,
        andreas@gaisler.com, andy@greyhouse.net, netdev@vger.kernel.org,
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        nios2-dev@lists.rocketboards.org, wens@csie.org
Subject: Re: [PATCH] net/3com/3c515: Fix MODULE_ARCH_VERMAGIC redefinition
Message-ID: <20200414122349.GB1011271@unreal>
References: <20200413045555.GE334007@unreal>
 <20200412.220739.516022706077351913.davem@davemloft.net>
 <20200413052637.GG334007@unreal>
 <20200412.223604.1160930629964379276.davem@davemloft.net>
 <20200413080452.GA3772@zn.tnic>
 <20200413084026.GH334007@unreal>
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On Mon, Apr 13, 2020 at 11:40:26AM +0300, Leon Romanovsky wrote:
> On Mon, Apr 13, 2020 at 10:04:52AM +0200, Borislav Petkov wrote:
> > On Sun, Apr 12, 2020 at 10:36:04PM -0700, David Miller wrote:
> > > From: Leon Romanovsky <leon@kernel.org>
> > > Date: Mon, 13 Apr 2020 08:26:37 +0300
> > >
> > > > How do you want us to handle it? Boris resend, me to send, you to fix?
> > >
> > > Anyone other than me can do it ;-)
> >
> > Ok, here's what I'm thinking: that vermagic.h is normally automatically
> > included in the *mod.c as part of the module creation, see add_header()
> > in modpost.c.
> >
> > So then perhaps drivers should not use it directly due to the current
> > inclusion order:
> >
> > linux/module.h includes asm/module.h and that arch-specific header
> > defines MODULE_VERMAGIC* for the respective arch.
> >
> > linux/vermagic.h defines all those fallbacks for those MODULE_VERMAGIC*
> > things and if the inclusion order is swapped - we get the redefinition
> > warning.
> >
> > Yesterday I tried the below - basically get rid of all the remaining
> > includers of linux/vermagic.h but two are left:
> >
> > drivers/net/ethernet/hisilicon/hns3/hns3_enet.c:18:#include <linux/vermagic.h>
> > drivers/net/ethernet/netronome/nfp/nfp_main.c:17:#include <linux/vermagic.h>
> >
> > because both use VERMAGIC_STRING directly.
> >
> > So,
> >
> > * one could either allow that and sort the inclusion order so that, for
> > example, asm/module.h includes linux/vermagic.h and thus the fallbacks
> > are there present.
> >
> > or
> >
> > * remove all uses of VERMAGIC_STRING from the drivers, add a header
> > guard which prevents people from using it directly and leave
> > VERMAGIC_STRING only to the internal module machinery in the kernel.
> >
> > Judging by how only a handful of old drivers are even using that,
> > perhaps not too far fetched.
> >
> > In any case, this needs a maintainer decision.
> >
> > Leon, if you wanna do it whatever you guys end up agreeing on, just go
> > ahead and submit the patches - it's not like I don't have anything else
> > on the TODO :-) Just add a Reported-by: me and that should be enough.
>
> I broke it so I should fix and will send a patch today/tomorrow.

ok, the patches are here, will wait for the kbuild results and will send.
https://git.kernel.org/pub/scm/linux/kernel/git/leon/linux-rdma.git/log/?h=vermagic

Thanks

>
> Thanks
>
> >
> > If you're busy too, lemme know and I'll put it on my todo then.
> >
> > Thx.
> >
> > diff --git a/drivers/net/bonding/bonding_priv.h b/drivers/net/bonding/bonding_priv.h
> > index 45b77bc8c7b3..48cdf3a49a7d 100644
> > --- a/drivers/net/bonding/bonding_priv.h
> > +++ b/drivers/net/bonding/bonding_priv.h
> > @@ -14,7 +14,7 @@
> >
> >  #ifndef _BONDING_PRIV_H
> >  #define _BONDING_PRIV_H
> > -#include <linux/vermagic.h>
> > +#include <generated/utsrelease.h>
> >
> >  #define DRV_NAME	"bonding"
> >  #define DRV_DESCRIPTION	"Ethernet Channel Bonding Driver"
> > diff --git a/drivers/net/ethernet/3com/3c509.c b/drivers/net/ethernet/3com/3c509.c
> > index b762176a1406..139d0120f511 100644
> > --- a/drivers/net/ethernet/3com/3c509.c
> > +++ b/drivers/net/ethernet/3com/3c509.c
> > @@ -85,7 +85,6 @@
> >  #include <linux/device.h>
> >  #include <linux/eisa.h>
> >  #include <linux/bitops.h>
> > -#include <linux/vermagic.h>
> >
> >  #include <linux/uaccess.h>
> >  #include <asm/io.h>
> > diff --git a/drivers/net/ethernet/3com/3c515.c b/drivers/net/ethernet/3com/3c515.c
> > index 90312fcd6319..47b4215bb93b 100644
> > --- a/drivers/net/ethernet/3com/3c515.c
> > +++ b/drivers/net/ethernet/3com/3c515.c
> > @@ -22,7 +22,6 @@
> >
> >  */
> >
> > -#include <linux/vermagic.h>
> >  #define DRV_NAME		"3c515"
> >
> >  #define CORKSCREW 1
> > diff --git a/drivers/net/ethernet/adaptec/starfire.c b/drivers/net/ethernet/adaptec/starfire.c
> > index 2db42211329f..a64191fc2af9 100644
> > --- a/drivers/net/ethernet/adaptec/starfire.c
> > +++ b/drivers/net/ethernet/adaptec/starfire.c
> > @@ -45,7 +45,6 @@
> >  #include <asm/processor.h>		/* Processor type for cache alignment. */
> >  #include <linux/uaccess.h>
> >  #include <asm/io.h>
> > -#include <linux/vermagic.h>
> >
> >  /*
> >   * The current frame processor firmware fails to checksum a fragment
> > diff --git a/drivers/net/ethernet/pensando/ionic/ionic_main.c b/drivers/net/ethernet/pensando/ionic/ionic_main.c
> > index 588c62e9add7..3ed150512091 100644
> > --- a/drivers/net/ethernet/pensando/ionic/ionic_main.c
> > +++ b/drivers/net/ethernet/pensando/ionic/ionic_main.c
> > @@ -6,7 +6,7 @@
> >  #include <linux/module.h>
> >  #include <linux/netdevice.h>
> >  #include <linux/utsname.h>
> > -#include <linux/vermagic.h>
> > +#include <generated/utsrelease.h>
> >
> >  #include "ionic.h"
> >  #include "ionic_bus.h"
> > diff --git a/drivers/power/supply/test_power.c b/drivers/power/supply/test_power.c
> > index 65c23ef6408d..b3c05ff05783 100644
> > --- a/drivers/power/supply/test_power.c
> > +++ b/drivers/power/supply/test_power.c
> > @@ -16,7 +16,7 @@
> >  #include <linux/power_supply.h>
> >  #include <linux/errno.h>
> >  #include <linux/delay.h>
> > -#include <linux/vermagic.h>
> > +#include <generated/utsrelease.h>
> >
> >  enum test_power_id {
> >  	TEST_AC,
> > diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
> > index 89d0b1827aaf..adab97e500cf 100644
> > --- a/net/ethtool/ioctl.c
> > +++ b/net/ethtool/ioctl.c
> > @@ -17,7 +17,6 @@
> >  #include <linux/phy.h>
> >  #include <linux/bitops.h>
> >  #include <linux/uaccess.h>
> > -#include <linux/vermagic.h>
> >  #include <linux/vmalloc.h>
> >  #include <linux/sfp.h>
> >  #include <linux/slab.h>
> > @@ -29,6 +28,8 @@
> >  #include <net/flow_offload.h>
> >  #include <linux/ethtool_netlink.h>
> >
> > +#include <generated/utsrelease.h>
> > +
> >  #include "common.h"
> >
> >  /*
> >
> >
> > --
> > Regards/Gruss,
> >     Boris.
> >
> > https://people.kernel.org/tglx/notes-about-netiquette