Re: Bisected: RED State Exception in 4.5 on E420R

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From: Rob Gardner <rob.gardner@xxxxxxxxxx>
Date: Wed, 27 Apr 2016 13:46:46 -0600

> On 04/27/2016 01:36 PM, David Miller wrote:
>> From: David Miller <davem@xxxxxxxxxxxxx>
>> Date: Wed, 27 Apr 2016 15:33:55 -0400 (EDT)
>>
>>> Therefore some other aspect of the change is causing problems and I
>>> think that aspect is the size of the new code.
>> Actually, there is a way to prove that this is indeed the bug, Meelis
>> what does the entry for "swapper_tsb" say in your System.map file for
>> a failing kernel?
>>
>> If it is not "0000000000408000", then that shows the bug.
>>
> 
> 
> I've run into this situation, and the assembler emits a warning that
> looks like this:
> 
> arch/sparc/kernel/head_64.S:869: Warning: .space or .fill with
> negative value, ignored
> 
> I've worked around it by moving some of the includes to after the
> ttable include. I think this is ok as long as code doesn't get
> situated too far away for the branch displacement to handle.

Maybe older binutils don't catch this properly.

On my config here I definitely can see that the size is getting
really close to the limit, and that's without all of the mentioned
features enabled.

Meanwhile, I'll keep working on the patch I said I'd do which trims
down the size of all of this code.
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