[ 012/104] powerpc: Fix hardware IRQs with MMU on exceptions when HV=0

[Greg Kroah-Hartman]

3.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Michael Neuling <mikey@xxxxxxxxxxx>

commit 3e96ca7f007ddb06b82a74a68585d1dbafa85ff1 upstream.

POWER8 allows us to take interrupts with the MMU on.  This gives us a
second set of vectors offset at 0x4000.

Unfortunately when coping these vectors we missed checking for MSR HV
for hardware interrupts (0x500).  This results in us trying to use
HSRR0/1 when HV=0, rather than SRR0/1 on HW IRQs

The below fixes this to check CPU_FTR_HVMODE when patching the code at
0x4500.

Also we remove the check for CPU_FTR_ARCH_206 since relocation on IRQs
are only available in arch 2.07 and beyond.

Thanks to benh for helping find this.

Signed-off-by: Michael Neuling <mikey@xxxxxxxxxxx>
Signed-off-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 arch/powerpc/kernel/exceptions-64s.S |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -740,7 +740,7 @@ hardware_interrupt_relon_hv:
 		_MASKABLE_RELON_EXCEPTION_PSERIES(0x502, hardware_interrupt, EXC_HV, SOFTEN_TEST_HV)
 	FTR_SECTION_ELSE
 		_MASKABLE_RELON_EXCEPTION_PSERIES(0x500, hardware_interrupt, EXC_STD, SOFTEN_TEST_PR)
-	ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_206)
+	ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
 	STD_RELON_EXCEPTION_PSERIES(0x4600, 0x600, alignment)
 	STD_RELON_EXCEPTION_PSERIES(0x4700, 0x700, program_check)
 	STD_RELON_EXCEPTION_PSERIES(0x4800, 0x800, fp_unavailable)


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