Re: [PATCH] Revert "MIPS: mm: tlbex: Use cpu_has_mips_r2_exec_hazard for the EHB instruction"

From: Maciej W. Rozycki
Date: Mon Feb 23 2015 - 20:11:21 EST

On Mon, 23 Feb 2015, David Daney wrote:

> From: David Daney <david.daney@xxxxxxxxxx>
> This reverts commit 77f3ee59ee7cfe19e0ee48d9a990c7967fbfcbed.
> There are two problems:
> 1) It breaks OCTEON, which will now crash in early boot with:
> Kernel panic - not syncing: No TLB refill handler yet (CPU type: 80)
> 2) The logic is broken.
> The meaning of cpu_has_mips_r2_exec_hazard is that the EHB instruction
> is required. The offending patch attempts (and fails) to change the
> meaning to be that EHB is part of the ISA.
> Signed-off-by: David Daney <david.daney@xxxxxxxxxx>
> ---

Code affected will have to be reconsidered including possibly older
changes as well. Meanwhile, to revert the immediate regression, you have

Reviewed-by: Maciej W. Rozycki <macro@xxxxxxxxxxxxxx>

Next time please try to use the imperative mood for the commit message
though, as per Documentation/SubmittingPatches.

Overall I think it makes sense to have a look back there every once in a
while to avoid getting trapped in routine. Some breakage we fall into
from time to time results from missing the guidelines set there, sigh.

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