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Subject[PATCH] kernel.h: Verify that arguments to swap() are the same type
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Signed-off-by: Joe Perches <joe@perches.com>

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index d6320a3..72878a5 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -637,8 +637,13 @@ static inline void ftrace_dump(void) { }
/*
* swap - swap value of @a and @b
*/
-#define swap(a, b) \
- do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
+#define swap(a, b) \
+do { \
+ typeof(a) __tmp = (a); \
+ BUILD_BUG_ON(!__same_type(__tmp, (b))); \
+ (a) = (b); \
+ (b) = __tmp; \
+} while (0)

/**
* container_of - cast a member of a structure out to the containing structure



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