ARM: 6766/1: Thumb-2: Reflect ARM/Thumb-2 configuration in module ver…

…magic

Loading Thumb-2 modules into an ARM kernel or vice-versa isn't
guaranteed to work safely, since the kernel is not interworking-
aware everywhere.

This patch adds "thumb2" to the module vermagic when
CONFIG_THUMB2_KERNEL is enabled, to help avoid accidental loading
of modules into the wrong kernel.

Signed-off-by: Dave Martin <dave.martin@linaro.org>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/include/asm/module.h

@@ -40,8 +40,16 @@ struct mod_arch_specific {
 #define MODULE_ARCH_VERMAGIC_P2V ""
 #endif
 
+/* Add instruction set architecture tag to distinguish ARM/Thumb kernels */
+#ifdef CONFIG_THUMB2_KERNEL
+#define MODULE_ARCH_VERMAGIC_ARMTHUMB "thumb2 "
+#else
+#define MODULE_ARCH_VERMAGIC_ARMTHUMB ""
+#endif
+
 #define MODULE_ARCH_VERMAGIC \
 	MODULE_ARCH_VERMAGIC_ARMVSN \
+	MODULE_ARCH_VERMAGIC_ARMTHUMB \
 	MODULE_ARCH_VERMAGIC_P2V
 
 #endif /* _ASM_ARM_MODULE_H */