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module: show version information for built-in modules in sysfs

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Currently only drivers that are built as modules have their versions
shown in /sys/module/<module_name>/version, but this information might
also be useful for built-in drivers as well. This especially important
for drivers that do not define any parameters - such drivers, if
built-in, are completely invisible from userspace.

This patch changes MODULE_VERSION() macro so that in case when we are
compiling built-in module, version information is stored in a separate
section. Kernel then uses this data to create 'version' sysfs attribute
in the same fashion it creates attributes for module parameters.

Signed-off-by: Dmitry Torokhov <dtor@vmware.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Dmitry Torokhov 2010-12-15 14:00:19 -08:00 • committed by Rusty Russell
parent 1bae4ce27c
commit e94965ed5b
3 changed files with 88 additions and 11 deletions
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27
include/linux/module.h
View file

@ -58,6 +58,12 @@ struct module_attribute {
void (*free)(struct module *);
};
struct module_version_attribute {
struct module_attribute mattr;
const char *module_name;
const char *version;
};
struct module_kobject
{
struct kobject kobj;
@ -161,7 +167,28 @@ extern struct module __this_module;
Using this automatically adds a checksum of the .c files and the
local headers in "srcversion".
*/
#ifdef MODULE
#define MODULE_VERSION(_version) MODULE_INFO(version, _version)
#else
#define MODULE_VERSION(_version) \
extern ssize_t __modver_version_show(struct module_attribute *, \
struct module *, char *); \
static struct module_version_attribute __modver_version_attr \
__used \
__attribute__ ((__section__ ("__modver"),aligned(sizeof(void *)))) \
= { \
.mattr = { \
.attr = { \
.name = "version", \
.mode = S_IRUGO, \
}, \
.show = __modver_version_show, \
}, \
.module_name = KBUILD_MODNAME, \
.version = _version, \
}
#endif
/* Optional firmware file (or files) needed by the module
* format is simply firmware file name. Multiple firmware