From 62d0fd591db1f9dcf68fb963b3a94af085a6b166 Mon Sep 17 00:00:00 2001
From: Masahiro Yamada <masahiroy@kernel.org>
Date: Wed, 22 Apr 2020 01:13:55 +0900
Subject: arch: split MODULE_ARCH_VERMAGIC definitions out to <asm/vermagic.h>

As the bug report [1] pointed out, <linux/vermagic.h> must be included
after <linux/module.h>.

I believe we should not impose any include order restriction. We often
sort include directives alphabetically, but it is just coding style
convention. Technically, we can include header files in any order by
making every header self-contained.

Currently, arch-specific MODULE_ARCH_VERMAGIC is defined in
<asm/module.h>, which is not included from <linux/vermagic.h>.

Hence, the straight-forward fix-up would be as follows:

|--- a/include/linux/vermagic.h
|+++ b/include/linux/vermagic.h
|@@ -1,5 +1,6 @@
| /* SPDX-License-Identifier: GPL-2.0 */
| #include <generated/utsrelease.h>
|+#include <linux/module.h>
|
| /* Simply sanity version stamp for modules. */
| #ifdef CONFIG_SMP

This works enough, but for further cleanups, I split MODULE_ARCH_VERMAGIC
definitions into <asm/vermagic.h>.

With this, <linux/module.h> and <linux/vermagic.h> will be orthogonal,
and the location of MODULE_ARCH_VERMAGIC definitions will be consistent.

For arc and ia64, MODULE_PROC_FAMILY is only used for defining
MODULE_ARCH_VERMAGIC. I squashed it.

For hexagon, nds32, and xtensa, I removed <asm/modules.h> entirely
because they contained nothing but MODULE_ARCH_VERMAGIC definition.
Kbuild will automatically generate <asm/modules.h> at build-time,
wrapping <asm-generic/module.h>.

[1] https://lore.kernel.org/lkml/20200411155623.GA22175@zn.tnic

Reported-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Jessica Yu <jeyu@kernel.org>
---
 include/linux/vermagic.h | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

(limited to 'include/linux/vermagic.h')

diff --git a/include/linux/vermagic.h b/include/linux/vermagic.h
index 9aced11e9000..dc236577b92f 100644
--- a/include/linux/vermagic.h
+++ b/include/linux/vermagic.h
@@ -1,5 +1,9 @@
 /* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_VERMAGIC_H
+#define _LINUX_VERMAGIC_H
+
 #include <generated/utsrelease.h>
+#include <asm/vermagic.h>
 
 /* Simply sanity version stamp for modules. */
 #ifdef CONFIG_SMP
@@ -24,9 +28,6 @@
 #else
 #define MODULE_VERMAGIC_MODVERSIONS ""
 #endif
-#ifndef MODULE_ARCH_VERMAGIC
-#define MODULE_ARCH_VERMAGIC ""
-#endif
 #ifdef RANDSTRUCT_PLUGIN
 #include <generated/randomize_layout_hash.h>
 #define MODULE_RANDSTRUCT_PLUGIN "RANDSTRUCT_PLUGIN_" RANDSTRUCT_HASHED_SEED
@@ -41,3 +42,4 @@
 	MODULE_ARCH_VERMAGIC						\
 	MODULE_RANDSTRUCT_PLUGIN
 
+#endif /* _LINUX_VERMAGIC_H */
-- 
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