[PATCH] powerpc: Fix HMIs on big-endian with CONFIG_RELOCATABLE=y

[Benjamin Herrenschmidt]

HMIs will crash the kernel due to

	BRANCH_LINK_TO_FAR(hmi_exception_realmode)

Calling into the OPD instead of the actual code.

Signed-off-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>
---

This hack fixes it for me, but it's not great. Nick, any better idea ?

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index ea04dfb..752709cc8 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -1119,7 +1119,11 @@ TRAMP_REAL_BEGIN(hmi_exception_early)
 	EXCEPTION_PROLOG_COMMON_2(PACA_EXGEN)
 	EXCEPTION_PROLOG_COMMON_3(0xe60)
 	addi	r3,r1,STACK_FRAME_OVERHEAD
+#ifdef PPC64_ELF_ABI_v1
+	BRANCH_LINK_TO_FAR(.hmi_exception_realmode) /* Function call ABI */
+#else
 	BRANCH_LINK_TO_FAR(hmi_exception_realmode) /* Function call ABI */
+#endif
 	cmpdi	cr0,r3,0
 
 	/* Windup the stack. */