[PATCH 1/3] module: put modversions in vermagic

[Rusty Russell]

Don't allow a module built without versions altogether to be inserted
into a kernel which expects modversions.

modprobe --force will strip vermagic as well as modversions, so it
won't be effected, but this will make sure that a
non-CONFIG_MODVERSIONS module won't be accidentally inserted into a
CONFIG_MODVERSIONS kernel.

Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
---
 include/linux/vermagic.h |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff -r a39eaf516de9 include/linux/vermagic.h
--- a/include/linux/vermagic.h	Thu May 08 14:20:44 2008 +1000
+++ b/include/linux/vermagic.h	Thu May 08 15:18:47 2008 +1000
@@ -17,6 +17,11 @@
 #else
 #define MODULE_VERMAGIC_MODULE_UNLOAD ""
 #endif
+#ifdef CONFIG_MODVERSIONS
+#define MODULE_VERMAGIC_MODVERSIONS "modversions "
+#else
+#define MODULE_VERMAGIC_MODVERSIONS ""
+#endif
 #ifndef MODULE_ARCH_VERMAGIC
 #define MODULE_ARCH_VERMAGIC ""
 #endif
@@ -24,5 +29,6 @@
 #define VERMAGIC_STRING 						\
 	UTS_RELEASE " "							\
 	MODULE_VERMAGIC_SMP MODULE_VERMAGIC_PREEMPT 			\
-	MODULE_VERMAGIC_MODULE_UNLOAD MODULE_ARCH_VERMAGIC
+	MODULE_VERMAGIC_MODULE_UNLOAD MODULE_VERMAGIC_MODVERSIONS	\
+	MODULE_ARCH_VERMAGIC
 
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