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authorDmitry Torokhov <dtor@vmware.com>2010-12-15 14:00:19 -0800
committerRusty Russell <rusty@rustcorp.com.au>2011-01-24 14:32:51 +1030
commite94965ed5beb23c6fabf7ed31f625e66d7ff28de (patch)
tree842e4cab961b568bcb98d8ab80d7d399110598a4 /include
parent1bae4ce27c9c90344f23c65ea6966c50ffeae2f5 (diff)
module: show version information for built-in modules in sysfs
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>
Diffstat (limited to 'include')
-rw-r--r--include/asm-generic/vmlinux.lds.h7
-rw-r--r--include/linux/module.h27
2 files changed, 34 insertions, 0 deletions
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 68649336c4a..6ebb81030d2 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -364,6 +364,13 @@
VMLINUX_SYMBOL(__start___param) = .; \
*(__param) \
VMLINUX_SYMBOL(__stop___param) = .; \
+ } \
+ \
+ /* Built-in module versions. */ \
+ __modver : AT(ADDR(__modver) - LOAD_OFFSET) { \
+ VMLINUX_SYMBOL(__start___modver) = .; \
+ *(__modver) \
+ VMLINUX_SYMBOL(__stop___modver) = .; \
. = ALIGN((align)); \
VMLINUX_SYMBOL(__end_rodata) = .; \
} \
diff --git a/include/linux/module.h b/include/linux/module.h
index 8b17fd8c790..50efcd3ae85 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -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