1 files changed, 72 insertions, 29 deletions

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index e71ffd4eccb5..3ddfd8f62c05 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -27,12 +27,6 @@
 
 DEFINE_MUTEX(event_mutex);
 
-DEFINE_MUTEX(event_storage_mutex);
-EXPORT_SYMBOL_GPL(event_storage_mutex);
-
-char event_storage[EVENT_STORAGE_SIZE];
-EXPORT_SYMBOL_GPL(event_storage);
-
 LIST_HEAD(ftrace_events);
 static LIST_HEAD(ftrace_common_fields);
 
@@ -194,29 +188,60 @@ int trace_event_raw_init(struct ftrace_event_call *call)
 }
 EXPORT_SYMBOL_GPL(trace_event_raw_init);
 
+void *ftrace_event_buffer_reserve(struct ftrace_event_buffer *fbuffer,
+                                  struct ftrace_event_file *ftrace_file,
+                                  unsigned long len)
+{
+        struct ftrace_event_call *event_call = ftrace_file->event_call;
+
+        local_save_flags(fbuffer->flags);
+        fbuffer->pc = preempt_count();
+        fbuffer->ftrace_file = ftrace_file;
+
+        fbuffer->event =
+                trace_event_buffer_lock_reserve(&fbuffer->buffer, ftrace_file,
+                                                event_call->event.type, len,
+                                                fbuffer->flags, fbuffer->pc);
+        if (!fbuffer->event)
+                return NULL;
+
+        fbuffer->entry = ring_buffer_event_data(fbuffer->event);
+        return fbuffer->entry;
+}
+EXPORT_SYMBOL_GPL(ftrace_event_buffer_reserve);
+
+void ftrace_event_buffer_commit(struct ftrace_event_buffer *fbuffer)
+{
+        event_trigger_unlock_commit(fbuffer->ftrace_file, fbuffer->buffer,
+                                    fbuffer->event, fbuffer->entry,
+                                    fbuffer->flags, fbuffer->pc);
+}
+EXPORT_SYMBOL_GPL(ftrace_event_buffer_commit);
+
 int ftrace_event_reg(struct ftrace_event_call *call,
                      enum trace_reg type, void *data)
 {
         struct ftrace_event_file *file = data;
 
+        WARN_ON(!(call->flags & TRACE_EVENT_FL_TRACEPOINT));
         switch (type) {
         case TRACE_REG_REGISTER:
-                return tracepoint_probe_register(call->name,
+                return tracepoint_probe_register(call->tp,
                                                  call->class->probe,
                                                  file);
         case TRACE_REG_UNREGISTER:
-                tracepoint_probe_unregister(call->name,
+                tracepoint_probe_unregister(call->tp,
                                             call->class->probe,
                                             file);
                 return 0;
 
 #ifdef CONFIG_PERF_EVENTS
         case TRACE_REG_PERF_REGISTER:
-                return tracepoint_probe_register(call->name,
+                return tracepoint_probe_register(call->tp,
                                                  call->class->perf_probe,
                                                  call);
         case TRACE_REG_PERF_UNREGISTER:
-                tracepoint_probe_unregister(call->name,
+                tracepoint_probe_unregister(call->tp,
                                             call->class->perf_probe,
                                             call);
                 return 0;
@@ -328,7 +353,7 @@ static int __ftrace_event_enable_disable(struct ftrace_event_file *file,
                         if (ret) {
                                 tracing_stop_cmdline_record();
                                 pr_info("event trace: Could not enable event "
-                                        "%s\n", call->name);
+                                        "%s\n", ftrace_event_name(call));
                                 break;
                         }
                         set_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags);
@@ -457,27 +482,29 @@ __ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match,
 {
         struct ftrace_event_file *file;
         struct ftrace_event_call *call;
+        const char *name;
         int ret = -EINVAL;
 
         list_for_each_entry(file, &tr->events, list) {
 
                 call = file->event_call;
+                name = ftrace_event_name(call);
 
-                if (!call->name || !call->class || !call->class->reg)
+                if (!name || !call->class || !call->class->reg)
                         continue;
 
                 if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)
                         continue;
 
                 if (match &&
-                    strcmp(match, call->name) != 0 &&
+                    strcmp(match, name) != 0 &&
                     strcmp(match, call->class->system) != 0)
                         continue;
 
                 if (sub && strcmp(sub, call->class->system) != 0)
                         continue;
 
-                if (event && strcmp(event, call->name) != 0)
+                if (event && strcmp(event, name) != 0)
                         continue;
 
                 ftrace_event_enable_disable(file, set);
@@ -675,7 +702,7 @@ static int t_show(struct seq_file *m, void *v)
 
         if (strcmp(call->class->system, TRACE_SYSTEM) != 0)
                 seq_printf(m, "%s:", call->class->system);
-        seq_printf(m, "%s\n", call->name);
+        seq_printf(m, "%s\n", ftrace_event_name(call));
 
         return 0;
 }
@@ -768,7 +795,7 @@ system_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
         mutex_lock(&event_mutex);
         list_for_each_entry(file, &tr->events, list) {
                 call = file->event_call;
-                if (!call->name || !call->class || !call->class->reg)
+                if (!ftrace_event_name(call) || !call->class || !call->class->reg)
                         continue;
 
                 if (system && strcmp(call->class->system, system->name) != 0)
@@ -883,7 +910,7 @@ static int f_show(struct seq_file *m, void *v)
 
         switch ((unsigned long)v) {
         case FORMAT_HEADER:
-                seq_printf(m, "name: %s\n", call->name);
+                seq_printf(m, "name: %s\n", ftrace_event_name(call));
                 seq_printf(m, "ID: %d\n", call->event.type);
                 seq_printf(m, "format:\n");
                 return 0;
@@ -1503,6 +1530,7 @@ event_create_dir(struct dentry *parent, struct ftrace_event_file *file)
         struct trace_array *tr = file->tr;
         struct list_head *head;
         struct dentry *d_events;
+        const char *name;
         int ret;
 
         /*
@@ -1516,10 +1544,11 @@ event_create_dir(struct dentry *parent, struct ftrace_event_file *file)
         } else
                 d_events = parent;
 
-        file->dir = debugfs_create_dir(call->name, d_events);
+        name = ftrace_event_name(call);
+        file->dir = debugfs_create_dir(name, d_events);
         if (!file->dir) {
                 pr_warning("Could not create debugfs '%s' directory\n",
-                           call->name);
+                           name);
                 return -1;
         }
 
@@ -1543,7 +1572,7 @@ event_create_dir(struct dentry *parent, struct ftrace_event_file *file)
                 ret = call->class->define_fields(call);
                 if (ret < 0) {
                         pr_warning("Could not initialize trace point"
-                                   " events/%s\n", call->name);
+                                   " events/%s\n", name);
                         return -1;
                 }
         }
@@ -1607,15 +1636,17 @@ static void event_remove(struct ftrace_event_call *call)
 static int event_init(struct ftrace_event_call *call)
 {
         int ret = 0;
+        const char *name;
 
-        if (WARN_ON(!call->name))
+        name = ftrace_event_name(call);
+        if (WARN_ON(!name))
                 return -EINVAL;
 
         if (call->class->raw_init) {
                 ret = call->class->raw_init(call);
                 if (ret < 0 && ret != -ENOSYS)
                         pr_warn("Could not initialize trace events/%s\n",
-                                call->name);
+                                name);
         }
 
         return ret;
@@ -1777,6 +1808,16 @@ static void trace_module_add_events(struct module *mod)
 {
         struct ftrace_event_call **call, **start, **end;
 
+        if (!mod->num_trace_events)
+                return;
+
+        /* Don't add infrastructure for mods without tracepoints */
+        if (trace_module_has_bad_taint(mod)) {
+                pr_err("%s: module has bad taint, not creating trace events\n",
+                       mod->name);
+                return;
+        }
+
         start = mod->trace_events;
         end = mod->trace_events + mod->num_trace_events;
 
@@ -1851,7 +1892,7 @@ __trace_add_event_dirs(struct trace_array *tr)
                 ret = __trace_add_new_event(call, tr);
                 if (ret < 0)
                         pr_warning("Could not create directory for event %s\n",
-                                   call->name);
+                                   ftrace_event_name(call));
         }
 }
 
@@ -1860,18 +1901,20 @@ find_event_file(struct trace_array *tr, const char *system,  const char *event)
 {
         struct ftrace_event_file *file;
         struct ftrace_event_call *call;
+        const char *name;
 
         list_for_each_entry(file, &tr->events, list) {
 
                 call = file->event_call;
+                name = ftrace_event_name(call);
 
-                if (!call->name || !call->class || !call->class->reg)
+                if (!name || !call->class || !call->class->reg)
                         continue;
 
                 if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)
                         continue;
 
-                if (strcmp(event, call->name) == 0 &&
+                if (strcmp(event, name) == 0 &&
                     strcmp(system, call->class->system) == 0)
                         return file;
         }
@@ -1939,7 +1982,7 @@ event_enable_print(struct seq_file *m, unsigned long ip,
         seq_printf(m, "%s:%s:%s",
                    data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR,
                    data->file->event_call->class->system,
-                   data->file->event_call->name);
+                   ftrace_event_name(data->file->event_call));
 
         if (data->count == -1)
                 seq_printf(m, ":unlimited\n");
@@ -2159,7 +2202,7 @@ __trace_early_add_event_dirs(struct trace_array *tr)
                 ret = event_create_dir(tr->event_dir, file);
                 if (ret < 0)
                         pr_warning("Could not create directory for event %s\n",
-                                   file->event_call->name);
+                                   ftrace_event_name(file->event_call));
         }
 }
 
@@ -2183,7 +2226,7 @@ __trace_early_add_events(struct trace_array *tr)
                 ret = __trace_early_add_new_event(call, tr);
                 if (ret < 0)
                         pr_warning("Could not create early event %s\n",
-                                   call->name);
+                                   ftrace_event_name(call));
         }
 }
 
@@ -2515,7 +2558,7 @@ static __init void event_trace_self_tests(void)
                         continue;
 #endif
 
-                pr_info("Testing event %s: ", call->name);
+                pr_info("Testing event %s: ", ftrace_event_name(call));
 
                 /*
                  * If an event is already enabled, someone is using