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ARM: Thumb-2: Reflect ARM/Thumb-2 configuration in module vermagic

Message ID 1298652892-16384-1-git-send-email-dave.martin@linaro.org
State Superseded
Headers show

Commit Message

Dave Martin Feb. 25, 2011, 4:54 p.m. UTC 
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>
---
KernelVersion: rmk/p2v
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Patch

diff --git a/arch/arm/include/asm/module.h b/arch/arm/include/asm/module.h
index a2b775b..543b449 100644
--- a/arch/arm/include/asm/module.h
+++ b/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 */