Messages in this thread Patch in this message | | | Date | Tue, 18 Mar 2003 15:59:54 +0000 | From | John Levon <> | Subject | [PATCH] module load notification try 2 |
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Rusty, any happier with this one ?
The below implements a module load notification for oprofile's benefit. The oprofile part is not attached here, but seems to work OK.
regards john
diff -Naur -X dontdiff linux-linus/include/linux/module.h up/include/linux/module.h --- linux-linus/include/linux/module.h 2003-03-17 21:44:38.000000000 +0000 +++ up/include/linux/module.h 2003-03-18 14:34:07.000000000 +0000 @@ -142,6 +142,7 @@ const struct exception_table_entry *entry; }; +struct notifier_block; #ifdef CONFIG_MODULES @@ -352,6 +353,9 @@ /* For extable.c to search modules' exception tables. */ const struct exception_table_entry *search_module_extables(unsigned long addr); +int register_module_notifier(struct notifier_block * nb); +int unregister_module_notifier(struct notifier_block * nb); + #else /* !CONFIG_MODULES... */ #define EXPORT_SYMBOL(sym) #define EXPORT_SYMBOL_GPL(sym) @@ -396,6 +400,17 @@ { return NULL; } + +static inline int register_module_notifier(struct notifier_block * nb) +{ + return -ENOSYS; +} + +static inline int unregister_module_notifier(struct notifier_block * nb) +{ + return -ENOSYS; +} + #endif /* CONFIG_MODULES */ #ifdef MODULE diff -Naur -X dontdiff linux-linus/kernel/module.c up/kernel/module.c --- linux-linus/kernel/module.c 2003-03-17 21:44:21.000000000 +0000 +++ up/kernel/module.c 2003-03-18 15:42:56.000000000 +0000 @@ -31,6 +31,7 @@ #include <linux/errno.h> #include <linux/err.h> #include <linux/vermagic.h> +#include <linux/notifier.h> #include <asm/uaccess.h> #include <asm/semaphore.h> #include <asm/pgalloc.h> @@ -61,6 +62,29 @@ static LIST_HEAD(symbols); static LIST_HEAD(extables); +static DECLARE_MUTEX(notify_mutex); +static struct notifier_block * module_notify_list; + +int register_module_notifier(struct notifier_block * nb) +{ + int err; + down(¬ify_mutex); + err = notifier_chain_register(&module_notify_list, nb); + up(¬ify_mutex); + return err; +} +EXPORT_SYMBOL(register_module_notifier); + +int unregister_module_notifier(struct notifier_block * nb) +{ + int err; + down(¬ify_mutex); + err = notifier_chain_unregister(&module_notify_list, nb); + up(¬ify_mutex); + return err; +} +EXPORT_SYMBOL(unregister_module_notifier); + /* We require a truly strong try_module_get() */ static inline int strong_try_module_get(struct module *mod) { @@ -1368,6 +1392,10 @@ /* Drop lock so they can recurse */ up(&module_mutex); + down(¬ify_mutex); + notifier_call_chain(&module_notify_list, MODULE_STATE_COMING, mod); + up(¬ify_mutex); + /* Start the module */ ret = mod->init(); if (ret < 0) { - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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