MCE must not use PACA_EXGEN. When a general exception enables MSR_RI,
that means SPRN_SRR[01] and SPRN_SPRG are no longer used. However the
PACA save area is still in use.
---
 arch/powerpc/kernel/exceptions-64s.S | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/kernel/exceptions-64s.S 
b/arch/powerpc/kernel/exceptions-64s.S
index 694def6..4174c4e 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -984,14 +984,14 @@ ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_RADIX)
 machine_check_common:
 
        mfspr   r10,SPRN_DAR
-       std     r10,PACA_EXGEN+EX_DAR(r13)
+       std     r10,PACA_EXMC+EX_DAR(r13)
        mfspr   r10,SPRN_DSISR
-       stw     r10,PACA_EXGEN+EX_DSISR(r13)
+       stw     r10,PACA_EXMC+EX_DSISR(r13)
        EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC)
        FINISH_NAP
        RECONCILE_IRQ_STATE(r10, r11)
-       ld      r3,PACA_EXGEN+EX_DAR(r13)
-       lwz     r4,PACA_EXGEN+EX_DSISR(r13)
+       ld      r3,PACA_EXMC+EX_DAR(r13)
+       lwz     r4,PACA_EXMC+EX_DSISR(r13)
        std     r3,_DAR(r1)
        std     r4,_DSISR(r1)
        bl      save_nvgprs
-- 
2.8.1

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