[v3] booke/kprobe: Fix stack corrupt issue when kprobe 'stwu'

[tiejun.chen]

Tiejun Chen wrote:
> v1 -> v2: when allocate pgirq_ctx, use 'hw_cpu' to identify cpu ID in exc_lvl_early_init().
> v2 -> v3: add that specific return-from-program-exc to restore necessary thread info then
> we can withdraw the original patch #2.

Any feedback?

Thanks
Tiejun

> 
> Tiejun
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