Add vmalloc sync all calls in ftrace and kprobes modules

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

diff --git a/probes/lttng-ftrace.c b/probes/lttng-ftrace.c
index f2190370cdcdc9e2124ee4daa82520fb600c9880..27f4e2bef81117b6bb1e0dc257b838f1c97162c0 100644 (file)
--- a/probes/lttng-ftrace.c
+++ b/probes/lttng-ftrace.c
@@ -19,6 +19,7 @@
 #include "../ltt-events.h"
 #include "../wrapper/ringbuffer/frontend_types.h"
 #include "../wrapper/ftrace.h"
+#include "../wrapper/vmalloc.h"
 #include "../ltt-tracer.h"
 
 static
@@ -115,6 +116,9 @@ int lttng_ftrace_register(const char *name,
        if (!event->u.ftrace.symbol_name)
                goto name_error;
 
+       /* Ensure the memory we just allocated don't trigger page faults */
+       wrapper_vmalloc_sync_all();
+
        ret = wrapper_register_ftrace_function_probe(event->u.ftrace.symbol_name,
                        &lttng_ftrace_ops, event);
        if (ret)
@@ -144,6 +148,7 @@ EXPORT_SYMBOL_GPL(lttng_ftrace_unregister);
 /* This module is permanent. */
 int lttng_ftrace_init(void)
 {
+       wrapper_vmalloc_sync_all();
        return 0;
 }
 module_init(lttng_ftrace_init)