ftrace: add ftrace_vprintk

Impact: new helper function

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 9 insertions, 0 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 2129ab9d2a48..2f8ac1f008f5 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2951,6 +2951,15 @@ int __ftrace_printk(unsigned long ip, const char *fmt, ...)
 }
 EXPORT_SYMBOL_GPL(__ftrace_printk);
 
+int __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap)
+{
+        if (!(trace_flags & TRACE_ITER_PRINTK))
+                return 0;
+
+        return trace_vprintk(ip, task_curr_ret_stack(current), fmt, ap);
+}
+EXPORT_SYMBOL_GPL(__ftrace_vprintk);
+
 static int trace_panic_handler(struct notifier_block *this,
                                unsigned long event, void *unused)
 {