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Subject[RFC PATCH 4/5] Set KCONFIG_KSYMB as value for kconfig_ksymb module attribute
Update modpost to add in *.mod.c files generated for each
module the setting of module attribute kernel_ksymb to
value given by KBUILD_KSYMB macro.

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

Signed-off-by: Cristina Moraru <>
scripts/mod/modpost.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 48958d3..a105916 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -2245,6 +2245,12 @@ static void add_srcversion(struct buffer *b, struct module *mod)

+static void add_kconfig_symbol(struct buffer *b, struct module *mod)
+ buf_printf(b, "\n");
+ buf_printf(b, "MODULE_INFO(kconfig_symbol, KBUILD_KSYMB);\n");
static void write_if_changed(struct buffer *b, const char *fname)
char *tmp;
@@ -2478,6 +2484,7 @@ int main(int argc, char **argv)
add_depends(&buf, mod, modules);
add_moddevtable(&buf, mod);
add_srcversion(&buf, mod);
+ add_kconfig_symbol(&buf, mod);

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