From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Laura Abbott <labbott@redhat.com>
Date: Mon, 7 Jan 2019 21:03:10 +0000
Subject: [PATCH] modules: add rhelversion MODULE_INFO tag

There were several changes in the 5.0-rc1 kernel that required
this patch to be rebased with some context diff.

    Patchwork-id: 7379
    O-Subject: [kernel team] [RHEL8.0 BZ 1544999 1/2] modules: add rhelversion MODULE_INFO tag
    Bugzilla: 1544999
    RH-Acked-by: Tony Camuso <tcamuso@redhat.com>
    RH-Acked-by: Oleg Nesterov <oleg@redhat.com>
    RH-Acked-by: Jarod Wilson <jarod@redhat.com>

    Bugzilla: http://bugzilla.redhat.com/1544999

    kernel-alt commit 9816b4b6ca5d4c0504d8806ce99442c90afbc8e6
    Author: Prarit Bhargava <prarit@redhat.com>
    Date:   Fri Feb 9 18:09:26 2018 -0500

        [kernel] modules: add rhelversion MODULE_INFO tag

        Message-id: <20180209180926.5955-3-prarit@redhat.com>
        Patchwork-id: 205587
        O-Subject: [RHEL-ALT-7.5 BZ 1542796 2/2] modules: add rhelversion MODULE_INFO tag
        Bugzilla: 1542796
        RH-Acked-by: David Arcari <darcari@redhat.com>
        RH-Acked-by: Tony Camuso <tcamuso@redhat.com>
        RH-Acked-by: Steve Best <sbest@redhat.com>

        Bugzilla: http://bugzilla.redhat.com/1542796

        rhel7 commit 9af8c3992ce5fff253c49abc0dedb3ec77badba4
        Author: Kyle McMartin <kmcmarti@redhat.com>
        Date:   Fri Sep 12 17:46:12 2014 -0400

            [kernel] modules: add rhelversion MODULE_INFO tag

            Message-id: <20140912174612.GS29420@redacted.bos.redhat.com>
            Patchwork-id: 94052
            O-Subject: [RHEL7.1 PATCH 2/6 v4] modules: add rhelversion MODULE_INFO tag
            Bugzilla: 1110315
            RH-Acked-by: Prarit Bhargava <prarit@redhat.com>
            RH-Acked-by: Johannes Weiner <jweiner@redhat.com>
            RH-Acked-by: Don Zickus <dzickus@redhat.com>

            From: Kyle McMartin <kmcmarti@redhat.com>

            Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1110315

            >From kylem's RHEL8 post:

            Let's not lose this ability in RHEL8. Sadly can't be applied to RHEL7
            because it breaks KABI due to the struct module change.

            Inspired by bits of a147e4729d9920ccae2c717ca65c811cc0f93a1d in RHEL6,
            which got lost for RHEL7.0. :/

            Kyle is correct and doing this would break RHEL7's KABI.  I'm taking this
            patch in as a base and the next patch will resolve the KABI issues.

            [v2]: dzickus, cleanup add_rhelversion()
            [v4]: resubmitted along with 16k stacks change

            Signed-off-by: Jarod Wilson <jarod@redhat.com>

        Cc: Richard Guy Briggs <rgb@redhat.com>
        Cc: Peter Rajnoha <prajnoha@redhat.com>
        Cc: Laura Abbott <labbott@redhat.com>
        Cc: Josh Poimboeuf <jpoimboe@redhat.com>
        Signed-off-by: Herton R. Krzesinski <herton@redhat.com>

Upstream Status: RHEL only
Signed-off-by: Herton R. Krzesinski <herton@redhat.com>
Acked-by: Don Zickus <dzickus@redhat.com>
Acked-by: Prarit Bhargava <prarit@redhat.com>
---
 include/linux/module.h | 1 +
 kernel/module.c        | 2 ++
 scripts/mod/modpost.c  | 8 ++++++++
 3 files changed, 11 insertions(+)

diff --git a/include/linux/module.h b/include/linux/module.h
index e30ed5fa33a7..b960ea38d185 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -371,6 +371,7 @@ struct module {
 	struct module_attribute *modinfo_attrs;
 	const char *version;
 	const char *srcversion;
+	const char *rhelversion;
 	struct kobject *holders_dir;

 	/* Exported symbols */
diff --git a/kernel/module.c b/kernel/module.c
index 1c5cff34d9f2..670ceadd44d2 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -805,6 +805,7 @@ static struct module_attribute modinfo_##field = {                    \

 MODINFO_ATTR(version);
 MODINFO_ATTR(srcversion);
+MODINFO_ATTR(rhelversion);

 static char last_unloaded_module[MODULE_NAME_LEN+1];

@@ -1267,6 +1268,7 @@ static struct module_attribute *modinfo_attrs[] = {
 	&module_uevent,
 	&modinfo_version,
 	&modinfo_srcversion,
+	&modinfo_rhelversion,
 	&modinfo_initstate,
 	&modinfo_coresize,
 	&modinfo_initsize,
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 69341b36f271..dbc63328187c 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -21,6 +21,7 @@
 #include <errno.h>
 #include "modpost.h"
 #include "../../include/linux/license.h"
+#include "../../include/generated/uapi/linux/version.h"

 /* Are we using CONFIG_MODVERSIONS? */
 static int modversions = 0;
@@ -2393,6 +2394,12 @@ static void write_buf(struct buffer *b, const char *fname)
 	}
 }

+static void add_rhelversion(struct buffer *b, struct module *mod)
+{
+	buf_printf(b, "MODULE_INFO(rhelversion, \"%d.%d\");\n", RHEL_MAJOR,
+		   RHEL_MINOR);
+}
+
 static void write_if_changed(struct buffer *b, const char *fname)
 {
 	char *tmp;
@@ -2645,6 +2652,7 @@ int main(int argc, char **argv)
 		add_depends(&buf, mod);
 		add_moddevtable(&buf, mod);
 		add_srcversion(&buf, mod);
+		add_rhelversion(&buf, mod);

 		sprintf(fname, "%s.mod.c", mod->name);
 		write_if_changed(&buf, fname);
-- 
2.26.2

