Fix: update writeback instrumentation for kernel 4.14

[lttng-modules.git] / lttng-probes.c

diff --git a/lttng-probes.c b/lttng-probes.c
index d2723969ef7d887d818ce670a2ad8218aba46a45..51b0f8652a297eee9bb5d7a15df443972732f595 100644 (file)
--- a/lttng-probes.c
+++ b/lttng-probes.c
@@ -25,7 +25,7 @@
 #include <linux/mutex.h>
 #include <linux/seq_file.h>
 
-#include "lttng-events.h"
+#include <lttng-events.h>
 
 /*
  * probe list is protected by sessions lock.
@@ -44,6 +44,10 @@ static LIST_HEAD(lazy_probe_init);
  */
 static int lazy_nesting;
 
+DEFINE_PER_CPU(struct lttng_dynamic_len_stack, lttng_dynamic_len_stack);
+
+EXPORT_PER_CPU_SYMBOL_GPL(lttng_dynamic_len_stack);
+
 /*
  * Called under sessions lock.
  */
@@ -60,6 +64,14 @@ int check_event_provider(struct lttng_probe_desc *desc)
                                desc->provider,
                                provider_name_len))
                        return 0;       /* provider mismatch */
+               /*
+                * The event needs to contain at least provider name + _ +
+                * one or more letter.
+                */
+               if (strlen(desc->event_desc[i]->name) <= provider_name_len + 1)
+                       return 0;       /* provider mismatch */
+               if (desc->event_desc[i]->name[provider_name_len] != '_')
+                       return 0;       /* provider mismatch */
        }
        return 1;
 }
@@ -103,7 +115,7 @@ void lttng_lazy_probe_register(struct lttng_probe_desc *desc)
        /* We should be added at the head of the list */
        list_add(&desc->head, probe_list);
 desc_added:
-       printk(KERN_DEBUG "just registered probe %s containing %u events\n",
+       pr_debug("LTTng: just registered probe %s containing %u events\n",
                desc->provider, desc->nr_events);
 }
 
@@ -167,7 +179,7 @@ int lttng_probe_register(struct lttng_probe_desc *desc)
        }
        list_add(&desc->lazy_init_head, &lazy_probe_init);
        desc->lazy = 1;
-       printk(KERN_DEBUG "adding probe %s containing %u events to lazy registration list\n",
+       pr_debug("LTTng: adding probe %s containing %u events to lazy registration list\n",
                desc->provider, desc->nr_events);
        /*
         * If there is at least one active session, we need to register
@@ -189,7 +201,7 @@ void lttng_probe_unregister(struct lttng_probe_desc *desc)
                list_del(&desc->head);
        else
                list_del(&desc->lazy_init_head);
-       printk(KERN_DEBUG "just unregistered probe %s\n", desc->provider);
+       pr_debug("LTTng: just unregistered probe %s\n", desc->provider);
        lttng_unlock_sessions();
 }
 EXPORT_SYMBOL_GPL(lttng_probe_unregister);
@@ -243,10 +255,12 @@ static
 void *tp_list_start(struct seq_file *m, loff_t *pos)
 {
        struct lttng_probe_desc *probe_desc;
+       struct list_head *probe_list;
        int iter = 0, i;
 
        lttng_lock_sessions();
-       list_for_each_entry(probe_desc, &_probe_list, head) {
+       probe_list = lttng_get_probe_list_head();
+       list_for_each_entry(probe_desc, probe_list, head) {
                for (i = 0; i < probe_desc->nr_events; i++) {
                        if (iter++ >= *pos)
                                return (void *) probe_desc->event_desc[i];
@@ -260,10 +274,12 @@ static
 void *tp_list_next(struct seq_file *m, void *p, loff_t *ppos)
 {
        struct lttng_probe_desc *probe_desc;
+       struct list_head *probe_list;
        int iter = 0, i;
 
        (*ppos)++;
-       list_for_each_entry(probe_desc, &_probe_list, head) {
+       probe_list = lttng_get_probe_list_head();
+       list_for_each_entry(probe_desc, probe_list, head) {
                for (i = 0; i < probe_desc->nr_events; i++) {
                        if (iter++ >= *ppos)
                                return (void *) probe_desc->event_desc[i];
@@ -310,3 +326,12 @@ const struct file_operations lttng_tracepoint_list_fops = {
        .llseek = seq_lseek,
        .release = seq_release,
 };
+
+int lttng_probes_init(void)
+{
+       int cpu;
+
+       for_each_possible_cpu(cpu)
+               per_cpu_ptr(&lttng_dynamic_len_stack, cpu)->offset = 0;
+       return 0;
+}