diff --git a/Documentation/ABI/stable/sysfs-module b/Documentation/ABI/stable/sysfs-module
index 41b1f16e8795..47b8fd0e196e 100644
--- a/Documentation/ABI/stable/sysfs-module
+++ b/Documentation/ABI/stable/sysfs-module
@@ -45,3 +45,21 @@ Date:		Jun 2005
 Description:
 		If the module source has MODULE_VERSION, this file will contain
 		the version of the source code.
+
+What:		/sys/module/MODULENAME/scmversion
+Date:		November 2020
+KernelVersion:	5.12
+Contact:	Will McVicker <willmcvicker@google.com>
+Description:	This read-only file will appear if modpost was supplied with an
+		SCM version for the module. It can be enabled with the config
+		MODULE_SCMVERSION. The SCM version is retrieved by
+		scripts/setlocalversion, which means that the presence of this
+		file depends on CONFIG_LOCALVERSION_AUTO=y. When read, the SCM
+		version that the module was compiled with is returned. The SCM
+		version is returned in the following format::
+
+		===
+		Git:		g[a-f0-9]\+(-dirty)\?
+		Mercurial:	hg[a-f0-9]\+(-dirty)\?
+		Subversion:	svn[0-9]\+
+		===
diff --git a/include/linux/module.h b/include/linux/module.h
index 6aa2bc84d4af..62544b50e1c1 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -379,6 +379,7 @@ struct module {
 	struct module_attribute *modinfo_attrs;
 	const char *version;
 	const char *srcversion;
+	const char *scmversion;
 	struct kobject *holders_dir;
 
 	/* Exported symbols */
diff --git a/kernel/module/Kconfig b/kernel/module/Kconfig
index 4f0ccf66801f..6b5c1175faea 100644
--- a/kernel/module/Kconfig
+++ b/kernel/module/Kconfig
@@ -88,6 +88,20 @@ config MODULE_SRCVERSION_ALL
 	  the version).  With this option, such a "srcversion" field
 	  will be created for all modules.  If unsure, say N.
 
+config MODULE_SCMVERSION
+	bool "SCM version for modules"
+	depends on LOCALVERSION_AUTO
+	help
+	  This enables the module attribute "scmversion" which can be used
+	  by developers to identify the SCM version of a given module, e.g.
+	  git sha1 or hg sha1. The SCM version can be queried by modinfo or
+	  via the sysfs node: /sys/modules/MODULENAME/scmversion. This is
+	  useful when the kernel or kernel modules are updated separately
+	  since that causes the vermagic of the kernel and the module to
+	  differ.
+
+	  If unsure, say N.
+
 config MODULE_SIG
 	bool "Module signature verification"
 	select MODULE_SIG_FORMAT
diff --git a/kernel/module/main.c b/kernel/module/main.c
index fbe7cb2f2979..0f18b6ee980c 100644
--- a/kernel/module/main.c
+++ b/kernel/module/main.c
@@ -527,6 +527,7 @@ static struct module_attribute modinfo_##field = {                    \
 
 MODINFO_ATTR(version);
 MODINFO_ATTR(srcversion);
+MODINFO_ATTR(scmversion);
 
 static struct {
 	char name[MODULE_NAME_LEN + 1];
@@ -974,6 +975,7 @@ struct module_attribute *modinfo_attrs[] = {
 	&module_uevent,
 	&modinfo_version,
 	&modinfo_srcversion,
+	&modinfo_scmversion,
 	&modinfo_initstate,
 	&modinfo_coresize,
 #ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
index 9aaf1869fecf..cb21c173e15e 100644
--- a/scripts/Makefile.modpost
+++ b/scripts/Makefile.modpost
@@ -53,6 +53,33 @@ ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),)
 modpost-args += -n
 endif
 
+ifeq ($(CONFIG_MODULE_SCMVERSION),y)
+ifeq ($(KBUILD_EXTMOD),)
+module_srcpath := $(srctree)
+else
+# Get the external module's source path. KBUILD_EXTMOD could either be an
+# absolute path or relative path from $(srctree). This makes sure that we
+# aren't using a relative path from a separate working directory (O= or
+# KBUILD_OUTPUT) since that may not be the actual module's SCM project path. So
+# check the path relative to $(srctree) first.
+ifneq ($(realpath $(srctree)/$(KBUILD_EXTMOD) 2>/dev/null),)
+	module_srcpath := $(srctree)/$(KBUILD_EXTMOD)
+else
+	module_srcpath := $(KBUILD_EXTMOD)
+endif
+endif
+
+# Get the SCM version of the module. Sed verifies setlocalversion returns
+# a proper revision based on the SCM type, e.g. git, mercurial, or svn.
+# Note: relative M= paths are not supported when building the kernel out of the
+# srctree since setlocalversion won't be able to find the module srctree.
+module_scmversion := $(shell $(srctree)/scripts/setlocalversion $(module_srcpath) | \
+	sed -n 's/.*-\(\(g\|hg\)[a-fA-F0-9]\+\(-dirty\)\?\|svn[0-9]\+\).*/\1/p')
+ifneq ($(module_scmversion),)
+modpost-args += -v $(module_scmversion)
+endif
+endif
+
 ifeq ($(KBUILD_EXTMOD),)
 
 # Generate the list of in-tree objects in vmlinux
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index b31f848dbd3d..8772d5a69e87 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -29,6 +29,8 @@ static bool modversions;
 static bool all_versions;
 /* If we are modposting external module set to 1 */
 static bool external_module;
+#define MODULE_SCMVERSION_SIZE 64
+static char module_scmversion[MODULE_SCMVERSION_SIZE];
 /* Only warn about unresolved symbols */
 static bool warn_unresolved;
 
@@ -1999,6 +2001,9 @@ static void add_header(struct buffer *b, struct module *mod)
 	if (!external_module)
 		buf_printf(b, "\nMODULE_INFO(intree, \"Y\");\n");
 
+	if (module_scmversion[0] != '\0')
+		buf_printf(b, "\nMODULE_INFO(scmversion, \"%s\");\n", module_scmversion);
+
 	buf_printf(b,
 		   "\n"
 		   "#ifdef CONFIG_RETPOLINE\n"
@@ -2327,7 +2332,7 @@ int main(int argc, char **argv)
 	LIST_HEAD(dump_lists);
 	struct dump_list *dl, *dl2;
 
-	while ((opt = getopt(argc, argv, "ei:mnT:o:awENd:")) != -1) {
+	while ((opt = getopt(argc, argv, "ei:mnT:o:awENd:v:")) != -1) {
 		switch (opt) {
 		case 'e':
 			external_module = true;
@@ -2364,6 +2369,9 @@ int main(int argc, char **argv)
 		case 'd':
 			missing_namespace_deps = optarg;
 			break;
+		case 'v':
+			strncpy(module_scmversion, optarg, sizeof(module_scmversion) - 1);
+			break;
 		default:
 			exit(1);
 		}