[v2 09/12] powerpc/mce: Enable MCE notifiers in external modules

[Santosh Sivaraj]

From: Reza Arbab <ar...@linux.ibm.com>

Signed-off-by: Reza Arbab <ar...@linux.ibm.com>
---
 arch/powerpc/kernel/exceptions-64s.S | 6 ++++++
 arch/powerpc/kernel/mce.c            | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/arch/powerpc/kernel/exceptions-64s.S 
b/arch/powerpc/kernel/exceptions-64s.S
index c83e38a403fd..311f1392a2ec 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -458,6 +458,12 @@ EXC_COMMON_BEGIN(machine_check_handle_early)
        bl      machine_check_early
        std     r3,RESULT(r1)   /* Save result */
 
+       /* Notifiers may be in a module, so enable virtual addressing. */
+       mfmsr   r11
+       ori     r11,r11,MSR_IR
+       ori     r11,r11,MSR_DR
+       mtmsr   r11
+
        addi    r3,r1,STACK_FRAME_OVERHEAD
        bl      machine_check_notify
        ld      r11,RESULT(r1)
diff --git a/arch/powerpc/kernel/mce.c b/arch/powerpc/kernel/mce.c
index a8348a9bea5b..9e4d497837d8 100644
--- a/arch/powerpc/kernel/mce.c
+++ b/arch/powerpc/kernel/mce.c
@@ -50,11 +50,13 @@ int mce_register_notifier(struct notifier_block *nb)
 {
        return blocking_notifier_chain_register(&mce_notifier_list, nb);
 }
+EXPORT_SYMBOL_GPL(mce_register_notifier);
 
 int mce_unregister_notifier(struct notifier_block *nb)
 {
        return blocking_notifier_chain_unregister(&mce_notifier_list, nb);
 }
+EXPORT_SYMBOL_GPL(mce_unregister_notifier);
 
 static int check_memcpy_mcsafe(struct notifier_block *nb, unsigned long val,
                               void *data)
-- 
2.20.1