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tracepoint: Remove unused API functions
After the following commit:
commit b75ef8b44b
Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Wed Aug 10 15:18:39 2011 -0400
Tracepoint: Dissociate from module mutex
The following functions became unnecessary:
- tracepoint_probe_register_noupdate,
- tracepoint_probe_unregister_noupdate,
- tracepoint_probe_update_all.
In fact, none of the in-kernel tracers, nor LTTng, nor SystemTAP use
them. Remove those.
Moreover, the functions:
- tracepoint_iter_start,
- tracepoint_iter_next,
- tracepoint_iter_stop,
- tracepoint_iter_reset.
are unused by in-kernel tracers, LTTng and SystemTAP. Remove those too.
Link: http://lkml.kernel.org/r/1395379142-2118-2-git-send-email-mathieu.desnoyers@efficios.com
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Mathieu Desnoyers
Steven Rostedt
parent
bc4c426ee2
commit
0dea6d5263
@ -48,12 +48,6 @@ extern int tracepoint_probe_register(const char *name, void *probe, void *data);
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extern int
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tracepoint_probe_unregister(const char *name, void *probe, void *data);
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extern int tracepoint_probe_register_noupdate(const char *name, void *probe,
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void *data);
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extern int tracepoint_probe_unregister_noupdate(const char *name, void *probe,
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void *data);
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extern void tracepoint_probe_update_all(void);
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#ifdef CONFIG_MODULES
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struct tp_module {
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struct list_head list;
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@ -62,18 +56,6 @@ struct tp_module {
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};
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#endif /* CONFIG_MODULES */
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struct tracepoint_iter {
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#ifdef CONFIG_MODULES
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struct tp_module *module;
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#endif /* CONFIG_MODULES */
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struct tracepoint * const *tracepoint;
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};
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extern void tracepoint_iter_start(struct tracepoint_iter *iter);
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extern void tracepoint_iter_next(struct tracepoint_iter *iter);
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extern void tracepoint_iter_stop(struct tracepoint_iter *iter);
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extern void tracepoint_iter_reset(struct tracepoint_iter *iter);
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/*
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* tracepoint_synchronize_unregister must be called between the last tracepoint
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* probe unregistration and the end of module exit to make sure there is no
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@ -67,10 +67,7 @@ struct tracepoint_entry {
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};
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struct tp_probes {
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union {
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struct rcu_head rcu;
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struct list_head list;
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} u;
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struct rcu_head rcu;
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struct tracepoint_func probes[0];
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};
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@ -83,7 +80,7 @@ static inline void *allocate_probes(int count)
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static void rcu_free_old_probes(struct rcu_head *head)
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{
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kfree(container_of(head, struct tp_probes, u.rcu));
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kfree(container_of(head, struct tp_probes, rcu));
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}
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static inline void release_probes(struct tracepoint_func *old)
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@ -91,7 +88,7 @@ static inline void release_probes(struct tracepoint_func *old)
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if (old) {
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struct tp_probes *tp_probes = container_of(old,
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struct tp_probes, probes[0]);
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call_rcu_sched(&tp_probes->u.rcu, rcu_free_old_probes);
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call_rcu_sched(&tp_probes->rcu, rcu_free_old_probes);
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}
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}
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@ -459,204 +456,11 @@ int tracepoint_probe_unregister(const char *name, void *probe, void *data)
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}
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EXPORT_SYMBOL_GPL(tracepoint_probe_unregister);
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static LIST_HEAD(old_probes);
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static int need_update;
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static void tracepoint_add_old_probes(void *old)
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{
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need_update = 1;
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if (old) {
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struct tp_probes *tp_probes = container_of(old,
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struct tp_probes, probes[0]);
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list_add(&tp_probes->u.list, &old_probes);
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}
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}
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/**
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* tracepoint_probe_register_noupdate - register a probe but not connect
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* @name: tracepoint name
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* @probe: probe handler
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* @data: probe private data
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*
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* caller must call tracepoint_probe_update_all()
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*/
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int tracepoint_probe_register_noupdate(const char *name, void *probe,
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void *data)
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{
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struct tracepoint_func *old;
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mutex_lock(&tracepoints_mutex);
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old = tracepoint_add_probe(name, probe, data);
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if (IS_ERR(old)) {
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mutex_unlock(&tracepoints_mutex);
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return PTR_ERR(old);
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}
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tracepoint_add_old_probes(old);
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mutex_unlock(&tracepoints_mutex);
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return 0;
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}
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EXPORT_SYMBOL_GPL(tracepoint_probe_register_noupdate);
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/**
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* tracepoint_probe_unregister_noupdate - remove a probe but not disconnect
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* @name: tracepoint name
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* @probe: probe function pointer
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* @data: probe private data
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*
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* caller must call tracepoint_probe_update_all()
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*/
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int tracepoint_probe_unregister_noupdate(const char *name, void *probe,
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void *data)
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{
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struct tracepoint_func *old;
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mutex_lock(&tracepoints_mutex);
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old = tracepoint_remove_probe(name, probe, data);
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if (IS_ERR(old)) {
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mutex_unlock(&tracepoints_mutex);
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return PTR_ERR(old);
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}
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tracepoint_add_old_probes(old);
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mutex_unlock(&tracepoints_mutex);
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return 0;
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}
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EXPORT_SYMBOL_GPL(tracepoint_probe_unregister_noupdate);
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/**
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* tracepoint_probe_update_all - update tracepoints
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*/
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void tracepoint_probe_update_all(void)
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{
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LIST_HEAD(release_probes);
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struct tp_probes *pos, *next;
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mutex_lock(&tracepoints_mutex);
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if (!need_update) {
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mutex_unlock(&tracepoints_mutex);
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return;
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}
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if (!list_empty(&old_probes))
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list_replace_init(&old_probes, &release_probes);
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need_update = 0;
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tracepoint_update_probes();
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mutex_unlock(&tracepoints_mutex);
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list_for_each_entry_safe(pos, next, &release_probes, u.list) {
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list_del(&pos->u.list);
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call_rcu_sched(&pos->u.rcu, rcu_free_old_probes);
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}
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}
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EXPORT_SYMBOL_GPL(tracepoint_probe_update_all);
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/**
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* tracepoint_get_iter_range - Get a next tracepoint iterator given a range.
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* @tracepoint: current tracepoints (in), next tracepoint (out)
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* @begin: beginning of the range
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* @end: end of the range
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*
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* Returns whether a next tracepoint has been found (1) or not (0).
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* Will return the first tracepoint in the range if the input tracepoint is
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* NULL.
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*/
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static int tracepoint_get_iter_range(struct tracepoint * const **tracepoint,
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struct tracepoint * const *begin, struct tracepoint * const *end)
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{
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if (!*tracepoint && begin != end) {
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*tracepoint = begin;
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return 1;
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}
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if (*tracepoint >= begin && *tracepoint < end)
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return 1;
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return 0;
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}
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#ifdef CONFIG_MODULES
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static void tracepoint_get_iter(struct tracepoint_iter *iter)
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{
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int found = 0;
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struct tp_module *iter_mod;
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/* Core kernel tracepoints */
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if (!iter->module) {
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found = tracepoint_get_iter_range(&iter->tracepoint,
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__start___tracepoints_ptrs,
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__stop___tracepoints_ptrs);
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if (found)
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goto end;
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}
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/* Tracepoints in modules */
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mutex_lock(&tracepoints_mutex);
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list_for_each_entry(iter_mod, &tracepoint_module_list, list) {
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/*
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* Sorted module list
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*/
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if (iter_mod < iter->module)
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continue;
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else if (iter_mod > iter->module)
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iter->tracepoint = NULL;
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found = tracepoint_get_iter_range(&iter->tracepoint,
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iter_mod->tracepoints_ptrs,
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iter_mod->tracepoints_ptrs
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+ iter_mod->num_tracepoints);
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if (found) {
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iter->module = iter_mod;
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break;
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}
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}
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mutex_unlock(&tracepoints_mutex);
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end:
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if (!found)
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tracepoint_iter_reset(iter);
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}
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#else /* CONFIG_MODULES */
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static void tracepoint_get_iter(struct tracepoint_iter *iter)
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{
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int found = 0;
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/* Core kernel tracepoints */
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found = tracepoint_get_iter_range(&iter->tracepoint,
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__start___tracepoints_ptrs,
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__stop___tracepoints_ptrs);
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if (!found)
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tracepoint_iter_reset(iter);
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}
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#endif /* CONFIG_MODULES */
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void tracepoint_iter_start(struct tracepoint_iter *iter)
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{
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tracepoint_get_iter(iter);
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}
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EXPORT_SYMBOL_GPL(tracepoint_iter_start);
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void tracepoint_iter_next(struct tracepoint_iter *iter)
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{
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iter->tracepoint++;
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/*
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* iter->tracepoint may be invalid because we blindly incremented it.
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* Make sure it is valid by marshalling on the tracepoints, getting the
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* tracepoints from following modules if necessary.
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*/
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tracepoint_get_iter(iter);
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}
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EXPORT_SYMBOL_GPL(tracepoint_iter_next);
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void tracepoint_iter_stop(struct tracepoint_iter *iter)
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{
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}
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EXPORT_SYMBOL_GPL(tracepoint_iter_stop);
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void tracepoint_iter_reset(struct tracepoint_iter *iter)
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{
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#ifdef CONFIG_MODULES
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iter->module = NULL;
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#endif /* CONFIG_MODULES */
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iter->tracepoint = NULL;
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}
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EXPORT_SYMBOL_GPL(tracepoint_iter_reset);
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#ifdef CONFIG_MODULES
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static int tracepoint_module_coming(struct module *mod)
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{
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struct tp_module *tp_mod, *iter;
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struct tp_module *tp_mod;
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int ret = 0;
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if (!mod->num_tracepoints)
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@ -677,23 +481,7 @@ static int tracepoint_module_coming(struct module *mod)
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}
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tp_mod->num_tracepoints = mod->num_tracepoints;
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tp_mod->tracepoints_ptrs = mod->tracepoints_ptrs;
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/*
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* tracepoint_module_list is kept sorted by struct module pointer
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* address for iteration on tracepoints from a seq_file that can release
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* the mutex between calls.
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*/
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list_for_each_entry_reverse(iter, &tracepoint_module_list, list) {
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BUG_ON(iter == tp_mod); /* Should never be in the list twice */
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if (iter < tp_mod) {
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/* We belong to the location right after iter. */
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list_add(&tp_mod->list, &iter->list);
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goto module_added;
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}
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}
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/* We belong to the beginning of the list */
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list_add(&tp_mod->list, &tracepoint_module_list);
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module_added:
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list_add_tail(&tp_mod->list, &tracepoint_module_list);
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tracepoint_update_probe_range(mod->tracepoints_ptrs,
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mod->tracepoints_ptrs + mod->num_tracepoints);
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end:
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