diff options
| -rw-r--r-- | sys/kern/kern_module.c | 2 | ||||
| -rw-r--r-- | sys/sys/module.h | 13 |
2 files changed, 15 insertions, 0 deletions
diff --git a/sys/kern/kern_module.c b/sys/kern/kern_module.c index 9a1f159..72a6991 100644 --- a/sys/kern/kern_module.c +++ b/sys/kern/kern_module.c @@ -414,6 +414,8 @@ modfind(struct thread *td, struct modfind_args *uap) return (error); } +MODULE_VERSION(kernel, __FreeBSD_version); + #ifdef COMPAT_IA32 #include <sys/mount.h> #include <sys/socket.h> diff --git a/sys/sys/module.h b/sys/sys/module.h index b621ba3..bcffb45 100644 --- a/sys/sys/module.h +++ b/sys/sys/module.h @@ -114,7 +114,20 @@ struct mod_metadata { MODULE_METADATA(_md_##module##_on_##mdepend, MDT_DEPEND, \ &_##module##_depend_on_##mdepend, #mdepend) +/* + * Every kernel has a 'kernel' module with the version set to + * __FreeBSD_version. We embed a MODULE_DEPEND() inside every module + * that depends on the 'kernel' module. It uses the current value of + * __FreeBSD_version as the minimum and preferred versions. For the + * maximum version it rounds the version up to the end of its branch + * (i.e. M99999 for M.x). This allows a module built on M.x to work + * on M.y systems where y >= x, but fail on M.z systems where z < x. + */ +#define MODULE_KERNEL_MAXVER (roundup(__FreeBSD_version, 100000) - 1) + #define DECLARE_MODULE(name, data, sub, order) \ + MODULE_DEPEND(name, kernel, __FreeBSD_version, \ + __FreeBSD_version, MODULE_KERNEL_MAXVER); \ MODULE_METADATA(_md_##name, MDT_MODULE, &data, #name); \ SYSINIT(name##module, sub, order, module_register_init, &data) \ struct __hack |
