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

ozbenh · mpe · commit 505a314fb28c · 2018-12-22T21:43:55.000+11:00
HMIs will crash the kernel due to BRANCH_LINK_TO_FAR(hmi_exception_realmode) Calling into the OPD instead of the actual code. Fixes: 2337d20 ("powerpc/64: CONFIG_RELOCATABLE support for hmi interrupts") Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> [mpe: Use DOTSYM() rather than #ifdef] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
@@ -1031,7 +1031,7 @@ TRAMP_REAL_BEGIN(hmi_exception_early)
 	EXCEPTION_PROLOG_COMMON_2(PACA_EXGEN)
 	EXCEPTION_PROLOG_COMMON_3(0xe60)
 	addi	r3,r1,STACK_FRAME_OVERHEAD
-	BRANCH_LINK_TO_FAR(hmi_exception_realmode) /* Function call ABI */
+	BRANCH_LINK_TO_FAR(DOTSYM(hmi_exception_realmode)) /* Function call ABI */
 	cmpdi	cr0,r3,0
 
 	/* Windup the stack. */
