From: Arjan van de Ven <arjan@infradead.org>

For the CONFIG_BUG=n case we need to provide a stub WARN() macro;
do this in the same style as WARN_ON() is done.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/asm-generic/bug.h |    8 ++++++++
 1 file changed, 8 insertions(+)

diff -puN include/asm-generic/bug.h~add-a-warn-macro-this-is-warn_on-printk-arguments-fix-2 include/asm-generic/bug.h
--- a/include/asm-generic/bug.h~add-a-warn-macro-this-is-warn_on-printk-arguments-fix-2
+++ a/include/asm-generic/bug.h
@@ -77,6 +77,14 @@ extern void warn_slowpath(const char *fi
 	unlikely(__ret_warn_on);					\
 })
 #endif
+
+#ifndef WARN
+#define WARN(condition, format...) ({					\
+	int __ret_warn_on = !!(condition);				\
+	unlikely(__ret_warn_on);					\
+})
+#endif
+
 #endif
 
 #define WARN_ON_ONCE(condition)	({				\
_