This is a note to let you know that I've just added the patch titled
powerpc: Fix hardware IRQs with MMU on exceptions when HV=0
to the 3.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-fix-hardware-irqs-with-mmu-on-exceptions-when-hv-0.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3e96ca7f007ddb06b82a74a68585d1dbafa85ff1 Mon Sep 17 00:00:00 2001
From: Michael Neuling <mikey@xxxxxxxxxxx>
Date: Thu, 25 Apr 2013 15:30:57 +0000
Subject: powerpc: Fix hardware IRQs with MMU on exceptions when HV=0
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)
Patches currently in stable-queue which might be from mikey@xxxxxxxxxxx are
queue-3.8/powerpc-fix-hardware-irqs-with-mmu-on-exceptions-when-hv-0.patch
queue-3.8/powerpc-power8-fix-secondary-cpus-hanging-on-boot-for-hv-0.patch
queue-3.8/powerpc-add-isync-to-copy_and_flush.patch
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