kernel/0001-modules-add-rhelversion-MODULE_INFO-tag.patch

From 7afe1eeba1300845f0ff20d15e345e40fd3ee040 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 1ad393e62bef..3fb19abee033 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 646f1e2330d2..aed5b1fcadf8 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -799,6 +799,7 @@ static struct module_attribute modinfo_##field = {                    \

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

 static char last_unloaded_module[MODULE_NAME_LEN+1];

@@ -1263,6 +1264,7 @@ 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 5c3c50c5ec52..188eb460cede 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;
@@ -2381,6 +2382,12 @@ static void add_srcversion(struct buffer *b, struct module *mod)
 	}
 }

+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;
@@ -2644,6 +2651,7 @@ 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