On Thu, 20 Jan 2022 17:49:31 +0530, Ganesh Goudar wrote:

In realmode mce handler we use irq_work_queue() to defer
the processing of mce events, irq_work_queue() can only
be called when translation is enabled because it touches
memory outside RMA, hence we enable translation before
calling irq_work_queue and disable on return, though it
is not safe to do in realmode.

[...]

Applied to powerpc/next.

[1/1] powerpc/mce: Avoid using irq_work_queue() in realmode
      https://git.kernel.org/powerpc/c/cc15ff3275694fedc33cd3d53212a43eec7aa0bc

cheers