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Mahesh Salgaonkar authored
The current implementation of MCE early handling modifies CR0/1 registers without saving its old values. Fix this by moving early check for powersaving mode to machine_check_handle_early(). The power architecture 2.06 or later allows the possibility of getting machine check while in nap/sleep/winkle. The last bit of HSPRG0 is set to 1, if thread is woken up from winkle. Hence, clear the last bit of HSPRG0 (r13) before MCE handler starts using it as paca pointer. Also, the current code always puts the thread into nap state irrespective of whatever idle state it woke up from. Fix that by looking at paca->thread_idle_state and put the thread back into same state where it came from. Fixes: 1c51089f ("powerpc/book3s: Return from interrupt if coming from evil context.") Reported-by:
Paul Mackerras <paulus@samba.org> Signed-off-by:
Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Reviewed-by:
Shreyas B. Prabhu <shreyas@linux.vnet.ibm.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
bc14c491