blob: 82c96bd6b85e6b01b0f7c3686bf5eacac44b4990 [file] [log] [blame]
#ifndef __BACKPORT_LINUX_MODULE_H
#define __BACKPORT_LINUX_MODULE_H
#include_next <linux/module.h>
#include <linux/rcupdate.h>
/*
* The define overwriting module_init is based on the original module_init
* which looks like this:
* #define module_init(initfn) \
* static inline initcall_t __inittest(void) \
* { return initfn; } \
* int init_module(void) __attribute__((alias(#initfn)));
*
* To the call to the initfn we added the symbol dependency on compat
* to make sure that compat.ko gets loaded for any compat modules.
*/
extern void backport_dependency_symbol(void);
#ifdef BACKPORTS_GIT_TRACKED
#define BACKPORT_MOD_VERSIONS MODULE_VERSION(BACKPORTS_GIT_TRACKED);
#else
#define BACKPORT_MOD_VERSIONS \
MODULE_VERSION("backported from " BACKPORTED_KERNEL_NAME \
" (" BACKPORTED_KERNEL_VERSION ")" \
" using backports " BACKPORTS_VERSION);
#endif
#undef module_init
#define module_init(initfn) \
static int __init __init_backport(void) \
{ \
backport_dependency_symbol(); \
return initfn(); \
} \
int init_module(void) __attribute__((alias("__init_backport")));\
BACKPORT_MOD_VERSIONS
/*
* The define overwriting module_exit is based on the original module_exit
* which looks like this:
* #define module_exit(exitfn) \
* static inline exitcall_t __exittest(void) \
* { return exitfn; } \
* void cleanup_module(void) __attribute__((alias(#exitfn)));
*
* We replaced the call to the actual function exitfn() with a call to our
* function which calls the original exitfn() and then rcu_barrier()
*
* As a module will not be unloaded that ofter it should not have a big
* performance impact when rcu_barrier() is called on every module exit,
* also when no kfree_rcu() backport is used in that module.
*/
#undef module_exit
#define module_exit(exitfn) \
static void __exit __exit_compat(void) \
{ \
exitfn(); \
rcu_barrier(); \
} \
void cleanup_module(void) __attribute__((alias("__exit_compat")));
#if LINUX_VERSION_CODE < KERNEL_VERSION(3,3,0)
#undef param_check_bool
#define param_check_bool(name, p) __param_check(name, p, bool)
#endif
#endif /* __BACKPORT_LINUX_MODULE_H */