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

[ Upstream commit 505a314fb28ce122091691c51426fa85c084e115 ]

HMIs will crash the kernel due to

	BRANCH_LINK_TO_FAR(hmi_exception_realmode)

Calling into the OPD instead of the actual code.

Fixes: 2337d207288f ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 90af86f143a911365ecaf53b64f5d2b7fb653abd..e1dab9b1e447814b3a1c93c95f1d04be9c95c1be 100644 (file)
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -1123,7 +1123,7 @@ 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. */