x86: ftrace - simplify wait_for_nmi

Get rid of 'waited' stack variable.

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 5 insertions, 6 deletions

diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index 1b43086b097a..4d33224c055f 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -133,15 +133,14 @@ void ftrace_nmi_exit(void)
 
 static void wait_for_nmi(void)
 {
-        int waited = 0;
+        if (!atomic_read(&in_nmi))
+                return;
 
-        while (atomic_read(&in_nmi)) {
-                waited = 1;
+        do {
                 cpu_relax();
-        }
+        } while(atomic_read(&in_nmi));
 
-        if (waited)
-                nmi_wait_count++;
+        nmi_wait_count++;
 }
 
 static int