On 08/08/2016 02:28 PM, Michael Ellerman wrote: > Mahesh J Salgaonkar <mah...@linux.vnet.ibm.com> writes: > >> From: Mahesh Salgaonkar <mah...@linux.vnet.ibm.com> >> >> 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. >> >> Cc: sta...@vger.kernel.org > > The information I need is "which commit introduced the bug".
It fixes commit 1c51089: powerpc/book3s: Return from interrupt if coming from evil context. > Given that I can work out which stable releases we should backport the > patch to. It will need an backport to stable once it hits upstream. -Mahesh. > > cheers >