X-Git-Url: http://git.lttng.org./?a=blobdiff_plain;f=src%2Flttng-context-prio.c;h=cbe9480030756ec1ba34bd0441626243f417f840;hb=056c40d82b02499c6692e5c01e8da59d1e0bdd17;hp=a3034e4ef7e453094c953bb3b6131c30d5f2924e;hpb=4697aac7ad1bdb932a843d93076418f4048baad3;p=lttng-modules.git

diff --git a/src/lttng-context-prio.c b/src/lttng-context-prio.c
index a3034e4e..cbe94800 100644
--- a/src/lttng-context-prio.c
+++ b/src/lttng-context-prio.c
@@ -14,33 +14,16 @@
 #include <lttng/events-internal.h>
 #include <ringbuffer/frontend_types.h>
 #include <wrapper/vmalloc.h>
-#include <wrapper/kallsyms.h>
 #include <lttng/tracer.h>
 
-static
-int (*wrapper_task_prio_sym)(struct task_struct *t);
-
-int wrapper_task_prio_init(void)
-{
-	wrapper_task_prio_sym = (void *) kallsyms_lookup_funcptr("task_prio");
-	if (!wrapper_task_prio_sym) {
-		printk(KERN_WARNING "LTTng: task_prio symbol lookup failed.\n");
-		return -EINVAL;
-	}
-	return 0;
-}
-
 /*
- * Canary function to check for 'task_prio()' at compile time.
- *
- * From 'include/linux/sched.h':
- *
- *   extern int task_prio(const struct task_struct *p);
+ * task_prio() has been implemented as p->prio - MAX_RT_PRIO since at
+ * least kernel v3.0.
  */
-__attribute__((unused)) static
-int __canary__task_prio(const struct task_struct *p)
+static
+int wrapper_task_prio(struct task_struct *p)
 {
-	return task_prio(p);
+	return p->prio - MAX_RT_PRIO;
 }
 
 static
@@ -60,7 +43,7 @@ void prio_record(void *priv, struct lttng_kernel_probe_ctx *probe_ctx,
 {
 	int prio;
 
-	prio = wrapper_task_prio_sym(current);
+	prio = wrapper_task_prio(current);
 	chan->ops->event_write(ctx, &prio, sizeof(prio), lttng_alignof(prio));
 }
 
@@ -69,7 +52,7 @@ void prio_get_value(void *priv,
 		struct lttng_kernel_probe_ctx *lttng_probe_ctx,
 		struct lttng_ctx_value *value)
 {
-	value->u.s64 = wrapper_task_prio_sym(current);
+	value->u.s64 = wrapper_task_prio(current);
 }
 
 static const struct lttng_kernel_ctx_field *ctx_field = lttng_kernel_static_ctx_field(