Re: [PATCH] sparc64: sun4v TLB error power off events

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From: Bob Picco <bpicco@xxxxxxxxxx>
Date: Sun,  7 Sep 2014 11:47:38 -0400

> We've witnessed a few TLB events causing the machine to power off because
> of prom_halt. In one case it was some nfs related area during rmmod. Another
> was an mmapper of /dev/mem. A more recent one is an ITLB issue with
> a bad pagesize which could be a hardware bug. Bugs happen but we should
> attempt to not power off the machine and/or hang it when possible.

prom_halt() should not power off the machine, but rather drop us to
the OF command line "ok" prompt.

Why doesn't it do that?

We properly do a >tl1 vs. tl1 etrap call, so we should be at trap
level zero when we call into the prom to "exit".
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