linux-kernel - [RFC PATCH 1/3] Add kconfig_symbol attribute to struct module

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Date:	Sun, 31 Jul 2016 17:33:50 +0200
From:	Cristina Moraru <cristina.moraru09@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	mcgrof@...nel.org, teg@...m.no, kay@...y.org,
	rusty@...tcorp.com.au, akpm@...ux-foundation.org,
	Cristina Moraru <cristina.moraru09@...il.com>
Subject: [RFC PATCH 1/3] Add kconfig_symbol attribute to struct module

Create additional attribute in struct module
in order for each module to store its associate
kconfig CONFIG_* symbol.

The goal is to enable each module to expose in
/sys its corresponding CONFIG_* option. The value
of this attribute will be dynamically pegged by
modpost without requiring extra work from the
driver developers. Further, this information will
be used by a hardware interogation tool to extract
build information about the existent devices.

This patch is part of a research project within
Google Summer of Code of porting 'make localmodconfig'
for backported drivers.

Signed-off-by: Cristina Moraru <cristina.moraru09@...il.com>
---
 include/linux/module.h | 1 +
 kernel/module.c        | 1 +
 2 files changed, 2 insertions(+)

diff --git a/include/linux/module.h b/include/linux/module.h
index 3daf2b3..bef5e44 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -353,6 +353,7 @@ struct module {
 	struct module_attribute *modinfo_attrs;
 	const char *version;
 	const char *srcversion;
+	const char *kconfig_symbol;
 	struct kobject *holders_dir;

 	/* Exported symbols */
diff --git a/kernel/module.c b/kernel/module.c
index 5f71aa6..4463c6c 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -757,6 +757,7 @@ static struct module_attribute modinfo_##field = {                    \

 MODINFO_ATTR(version);
 MODINFO_ATTR(srcversion);
+MODINFO_ATTR(kconfig_symbol);

 static char last_unloaded_module[MODULE_NAME_LEN+1];

-- 
2.7.4