Re: [PATCH 1/2] powerpc/64: Make stack tracing work during very early boot

On Wed, 3 Feb 2021 00:02:06 +1100, Michael Ellerman wrote:

If we try to stack trace very early during boot, either due to a
WARN/BUG or manual dump_stack(), we will oops in
valid_emergency_stack() when we try to dereference the paca_ptrs
array.

The fix is simple, we just return false if paca_ptrs isn't allocated
yet. The stack pointer definitely isn't part of any emergency stack
because we haven't allocated any yet.

Applied to powerpc/next.

[1/2] powerpc/64: Make stack tracing work during very early boot
      https://git.kernel.org/powerpc/c/0ecf6a9e47d825b7dddfebca738386b809e59a94
[2/2] powerpc/64s: Handle program checks in wrong endian during early boot
      https://git.kernel.org/powerpc/c/e7eb919057c3450cdd9d335e4a23a4da8da58db4

cheers