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Date:   Mon, 13 Apr 2020 10:04:52 +0200
From:   Borislav Petkov <bp@alien8.de>
To:     David Miller <davem@davemloft.net>, leon@kernel.org
Cc:     kuba@kernel.org, thomas.lendacky@amd.com,
        keyur@os.amperecomputing.com, pcnet32@frontier.com,
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Subject: Re: [PATCH] net/3com/3c515: Fix MODULE_ARCH_VERMAGIC redefinition
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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.

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