powerpc pmap: initialize kernel pmap radix trie

[dougm]

Summary

Commit 2d2bcba7ba70141388729ed49674b36fd01146c5 changed radix trie implementation and made it necessary that radix tries be initialized with vm_radix_init. @dbaio reports that in some configurations, there is a powerpc boot panic and that this commit introduced the problem. In powerpc/aim/mmu_radix.c, the radix trie in kernel_pmap is initialized by zeroing all its fields.

Add a call to vm_radix_init to properly initialize kernel_pmap->pm_radix.

Test Plan

@dbaio reports that this change addresses the problem he has observed.

[pkubaj]

Can you also MFS to releng/14.0?

[dougm]

In D41846#955679, @pkubaj wrote:

Can you also MFS to releng/14.0?

If whoever is in charge of that gives me permission, I'll do it.

[pkubaj]

Well, you need to ask re@ and since it was your fix, you should probably be the one to do it.

[dougm]

In D41846#955841, @pkubaj wrote:

Well, you need to ask re@ and since it was your fix, you should probably be the one to do it.

I've asked. No response yet.