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