[PATCH 1/8] ftrace: Make FTRACE_WARN_ON() work in if condition

[Steven Rostedt]

From: Steven Rostedt <srostedt@xxxxxxxxxx>

Let FTRACE_WARN_ON() be used as a stand alone statement or
inside a conditional: if (FTRACE_WARN_ON(x))

Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
 kernel/trace/ftrace.c |   16 ++++++++++------
 1 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index ee24fa1..4ff6559 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -39,16 +39,20 @@
 #include "trace_stat.h"
 
 #define FTRACE_WARN_ON(cond)			\
-	do {					\
-		if (WARN_ON(cond))		\
+	({					\
+		int ___r = cond;		\
+		if (WARN_ON(___r))		\
 			ftrace_kill();		\
-	} while (0)
+		___r;				\
+	})
 
 #define FTRACE_WARN_ON_ONCE(cond)		\
-	do {					\
-		if (WARN_ON_ONCE(cond))		\
+	({					\
+		int ___r = cond;		\
+		if (WARN_ON_ONCE(___r))		\
 			ftrace_kill();		\
-	} while (0)
+		___r;				\
+	})
 
 /* hash bits for specific function selection */
 #define FTRACE_HASH_BITS 7
-- 
1.7.2.3


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