Re: v4.17 regression: PowerMac G3 won't boot, was Re: [PATCH v5 1/3] of: cache phandle nodes to reduce cost of of_find_node_by_phandle()

From: Rob Herring
Date: Wed Aug 29 2018 - 21:06:03 EST

On Wed, Aug 29, 2018 at 7:44 PM Finn Thain <fthain@xxxxxxxxxxxxxxxxxxx> wrote:
> Hi Frank,
> Linux v4.17 and later will no longer boot on a G3 PowerMac. The boot hangs
> very early, before any video driver loads.
> Stan and I were able to bisect the regression between v4.16 and v4.17 and
> arrived at commit 0b3ce78e90fc ("of: cache phandle nodes to reduce cost of
> of_find_node_by_phandle()").
> I don't see any obvious bug in 0b3ce78e90fc or b9952b5218ad. But if you
> revert these from v4.18 (which is also affected) that certainly resolves
> the issue.

Perhaps a bad assumption on phandle values causing a problem. Can you
provide a dump of all the phandle or linux,phandle values from