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tracepoints: use modules notifiers

Browse source 
Impact: cleanup

Use module notifiers for tracepoint updates rather than adding a hook in
module.c.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Mathieu Desnoyers 2008-11-14 17:47:46 -05:00 committed by Ingo Molnar
parent 5f382671de
commit 32f8574277
2 changed files with 29 additions and 5 deletions
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5
kernel/module.c
View file

@ -2187,11 +2187,6 @@ static noinline struct module *load_module(void __user *umod,
debug = section_objs(hdr, sechdrs, secstrings, "__verbose", debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
sizeof(*debug), &num_debug); sizeof(*debug), &num_debug);
dynamic_printk_setup(debug, num_debug); dynamic_printk_setup(debug, num_debug);
#ifdef CONFIG_TRACEPOINTS
tracepoint_update_probe_range(mod->tracepoints,
mod->tracepoints + mod->num_tracepoints);
#endif
} }
/* sechdrs[0].sh_size is always zero */ /* sechdrs[0].sh_size is always zero */

29
kernel/tracepoint.c
View file

@ -541,3 +541,32 @@ void tracepoint_iter_reset(struct tracepoint_iter *iter)
iter->tracepoint = NULL; iter->tracepoint = NULL;
} }
EXPORT_SYMBOL_GPL(tracepoint_iter_reset); EXPORT_SYMBOL_GPL(tracepoint_iter_reset);
int tracepoint_module_notify(struct notifier_block *self,
unsigned long val, void *data)
{
struct module *mod = data;
switch (val) {
case MODULE_STATE_COMING:
tracepoint_update_probe_range(mod->tracepoints,
mod->tracepoints + mod->num_tracepoints);
break;
case MODULE_STATE_GOING:
tracepoint_update_probe_range(mod->tracepoints,
mod->tracepoints + mod->num_tracepoints);
break;
}
return 0;
}
struct notifier_block tracepoint_module_nb = {
.notifier_call = tracepoint_module_notify,
.priority = 0,
};
static int init_tracepoints(void)
{
return register_module_notifier(&tracepoint_module_nb);
}
__initcall(init_tracepoints);