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authorMathieu Desnoyers <mathieu.desnoyers@efficios.com>2014-03-21 01:19:01 -0400
committerSteven Rostedt <rostedt@goodmis.org>2014-03-21 14:01:15 -0400
commit0dea6d52638b2693b18cd2ed8938b236e0789ddb (patch)
tree3b7e20b680b63900e81dee3a0f2469c4ae4abe7a /kernel/tracepoint.c
parentbc4c426ee2431d1f717004d3bbaacbd819b544fd (diff)
downloadlinux-0dea6d52638b2693b18cd2ed8938b236e0789ddb.tar.bz2
tracepoint: Remove unused API functions
After the following commit: commit b75ef8b44b1cb95f5a26484b0e2fe37a63b12b44 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>
Diffstat (limited to 'kernel/tracepoint.c')
-rw-r--r--kernel/tracepoint.c222
1 files changed, 5 insertions, 217 deletions
diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
index e2a58a22b0f4..65d9f9459a75 100644
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -67,10 +67,7 @@ struct tracepoint_entry {
};
struct tp_probes {
- union {
- struct rcu_head rcu;
- struct list_head list;
- } u;
+ struct rcu_head rcu;
struct tracepoint_func probes[0];
};
@@ -83,7 +80,7 @@ static inline void *allocate_probes(int count)
static void rcu_free_old_probes(struct rcu_head *head)
{
- kfree(container_of(head, struct tp_probes, u.rcu));
+ kfree(container_of(head, struct tp_probes, rcu));
}
static inline void release_probes(struct tracepoint_func *old)
@@ -91,7 +88,7 @@ static inline void release_probes(struct tracepoint_func *old)
if (old) {
struct tp_probes *tp_probes = container_of(old,
struct tp_probes, probes[0]);
- call_rcu_sched(&tp_probes->u.rcu, rcu_free_old_probes);
+ call_rcu_sched(&tp_probes->rcu, rcu_free_old_probes);
}
}
@@ -459,204 +456,11 @@ int tracepoint_probe_unregister(const char *name, void *probe, void *data)
}
EXPORT_SYMBOL_GPL(tracepoint_probe_unregister);
-static LIST_HEAD(old_probes);
-static int need_update;
-
-static void tracepoint_add_old_probes(void *old)
-{
- need_update = 1;
- if (old) {
- struct tp_probes *tp_probes = container_of(old,
- struct tp_probes, probes[0]);
- list_add(&tp_probes->u.list, &old_probes);
- }
-}
-
-/**
- * tracepoint_probe_register_noupdate - register a probe but not connect
- * @name: tracepoint name
- * @probe: probe handler
- * @data: probe private data
- *
- * caller must call tracepoint_probe_update_all()
- */
-int tracepoint_probe_register_noupdate(const char *name, void *probe,
- void *data)
-{
- struct tracepoint_func *old;
-
- mutex_lock(&tracepoints_mutex);
- old = tracepoint_add_probe(name, probe, data);
- if (IS_ERR(old)) {
- mutex_unlock(&tracepoints_mutex);
- return PTR_ERR(old);
- }
- tracepoint_add_old_probes(old);
- mutex_unlock(&tracepoints_mutex);
- return 0;
-}
-EXPORT_SYMBOL_GPL(tracepoint_probe_register_noupdate);
-
-/**
- * tracepoint_probe_unregister_noupdate - remove a probe but not disconnect
- * @name: tracepoint name
- * @probe: probe function pointer
- * @data: probe private data
- *
- * caller must call tracepoint_probe_update_all()
- */
-int tracepoint_probe_unregister_noupdate(const char *name, void *probe,
- void *data)
-{
- struct tracepoint_func *old;
-
- mutex_lock(&tracepoints_mutex);
- old = tracepoint_remove_probe(name, probe, data);
- if (IS_ERR(old)) {
- mutex_unlock(&tracepoints_mutex);
- return PTR_ERR(old);
- }
- tracepoint_add_old_probes(old);
- mutex_unlock(&tracepoints_mutex);
- return 0;
-}
-EXPORT_SYMBOL_GPL(tracepoint_probe_unregister_noupdate);
-
-/**
- * tracepoint_probe_update_all - update tracepoints
- */
-void tracepoint_probe_update_all(void)
-{
- LIST_HEAD(release_probes);
- struct tp_probes *pos, *next;
-
- mutex_lock(&tracepoints_mutex);
- if (!need_update) {
- mutex_unlock(&tracepoints_mutex);
- return;
- }
- if (!list_empty(&old_probes))
- list_replace_init(&old_probes, &release_probes);
- need_update = 0;
- tracepoint_update_probes();
- mutex_unlock(&tracepoints_mutex);
- list_for_each_entry_safe(pos, next, &release_probes, u.list) {
- list_del(&pos->u.list);
- call_rcu_sched(&pos->u.rcu, rcu_free_old_probes);
- }
-}
-EXPORT_SYMBOL_GPL(tracepoint_probe_update_all);
-
-/**
- * tracepoint_get_iter_range - Get a next tracepoint iterator given a range.
- * @tracepoint: current tracepoints (in), next tracepoint (out)
- * @begin: beginning of the range
- * @end: end of the range
- *
- * Returns whether a next tracepoint has been found (1) or not (0).
- * Will return the first tracepoint in the range if the input tracepoint is
- * NULL.
- */
-static int tracepoint_get_iter_range(struct tracepoint * const **tracepoint,
- struct tracepoint * const *begin, struct tracepoint * const *end)
-{
- if (!*tracepoint && begin != end) {
- *tracepoint = begin;
- return 1;
- }
- if (*tracepoint >= begin && *tracepoint < end)
- return 1;
- return 0;
-}
-
-#ifdef CONFIG_MODULES
-static void tracepoint_get_iter(struct tracepoint_iter *iter)
-{
- int found = 0;
- struct tp_module *iter_mod;
-
- /* Core kernel tracepoints */
- if (!iter->module) {
- found = tracepoint_get_iter_range(&iter->tracepoint,
- __start___tracepoints_ptrs,
- __stop___tracepoints_ptrs);
- if (found)
- goto end;
- }
- /* Tracepoints in modules */
- mutex_lock(&tracepoints_mutex);
- list_for_each_entry(iter_mod, &tracepoint_module_list, list) {
- /*
- * Sorted module list
- */
- if (iter_mod < iter->module)
- continue;
- else if (iter_mod > iter->module)
- iter->tracepoint = NULL;
- found = tracepoint_get_iter_range(&iter->tracepoint,
- iter_mod->tracepoints_ptrs,
- iter_mod->tracepoints_ptrs
- + iter_mod->num_tracepoints);
- if (found) {
- iter->module = iter_mod;
- break;
- }
- }
- mutex_unlock(&tracepoints_mutex);
-end:
- if (!found)
- tracepoint_iter_reset(iter);
-}
-#else /* CONFIG_MODULES */
-static void tracepoint_get_iter(struct tracepoint_iter *iter)
-{
- int found = 0;
-
- /* Core kernel tracepoints */
- found = tracepoint_get_iter_range(&iter->tracepoint,
- __start___tracepoints_ptrs,
- __stop___tracepoints_ptrs);
- if (!found)
- tracepoint_iter_reset(iter);
-}
-#endif /* CONFIG_MODULES */
-
-void tracepoint_iter_start(struct tracepoint_iter *iter)
-{
- tracepoint_get_iter(iter);
-}
-EXPORT_SYMBOL_GPL(tracepoint_iter_start);
-
-void tracepoint_iter_next(struct tracepoint_iter *iter)
-{
- iter->tracepoint++;
- /*
- * iter->tracepoint may be invalid because we blindly incremented it.
- * Make sure it is valid by marshalling on the tracepoints, getting the
- * tracepoints from following modules if necessary.
- */
- tracepoint_get_iter(iter);
-}
-EXPORT_SYMBOL_GPL(tracepoint_iter_next);
-
-void tracepoint_iter_stop(struct tracepoint_iter *iter)
-{
-}
-EXPORT_SYMBOL_GPL(tracepoint_iter_stop);
-
-void tracepoint_iter_reset(struct tracepoint_iter *iter)
-{
-#ifdef CONFIG_MODULES
- iter->module = NULL;
-#endif /* CONFIG_MODULES */
- iter->tracepoint = NULL;
-}
-EXPORT_SYMBOL_GPL(tracepoint_iter_reset);
#ifdef CONFIG_MODULES
static int tracepoint_module_coming(struct module *mod)
{
- struct tp_module *tp_mod, *iter;
+ struct tp_module *tp_mod;
int ret = 0;
if (!mod->num_tracepoints)
@@ -677,23 +481,7 @@ static int tracepoint_module_coming(struct module *mod)
}
tp_mod->num_tracepoints = mod->num_tracepoints;
tp_mod->tracepoints_ptrs = mod->tracepoints_ptrs;
-
- /*
- * tracepoint_module_list is kept sorted by struct module pointer
- * address for iteration on tracepoints from a seq_file that can release
- * the mutex between calls.
- */
- list_for_each_entry_reverse(iter, &tracepoint_module_list, list) {
- BUG_ON(iter == tp_mod); /* Should never be in the list twice */
- if (iter < tp_mod) {
- /* We belong to the location right after iter. */
- list_add(&tp_mod->list, &iter->list);
- goto module_added;
- }
- }
- /* We belong to the beginning of the list */
- list_add(&tp_mod->list, &tracepoint_module_list);
-module_added:
+ list_add_tail(&tp_mod->list, &tracepoint_module_list);
tracepoint_update_probe_range(mod->tracepoints_ptrs,
mod->tracepoints_ptrs + mod->num_tracepoints);
end: