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Re: 4.0-rc1 breakage in FPE?

To: David Daney <ddaney.cavm@gmail.com>
Subject: Re: 4.0-rc1 breakage in FPE?
From: Måns Rullgård <mans@mansr.com>
Date: Thu, 26 Feb 2015 11:29:46 +0000
Cc: Paul Martin <paul.martin@codethink.co.uk>, linux-mips@linux-mips.org
In-reply-to: <54EE4134.2050501@gmail.com> (David Daney's message of "Wed, 25 Feb 2015 13:40:04 -0800")
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References: <20150225182048.GC31062@paulmartin.codethink.co.uk> <yw1xh9u97k5c.fsf@unicorn.mansr.com> <54EE4134.2050501@gmail.com>
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David Daney <ddaney.cavm@gmail.com> writes:

> On 02/25/2015 01:31 PM, Måns Rullgård wrote:
>> Paul Martin <paul.martin@codethink.co.uk> writes:
>>
>>> Some change between 3.19 and 4.0-rc1 has broken the FPE such that some
>>> code running on an Octeon II is subtly not working.
>>>
>
> Can you say where your userspace comes from, so we can try to
> reproduce the issue?
>
>>> eg.
>>>
>>>    $ echo "1 2" | gawk '{ print $1 }'
>>>    1 2
>>>
>>> which should output (and does output on 3.19)
>>>
>>>    $ echo "1 2" | gawk '{ print $1 }'
>>>    1
>>>
>>> I'm going to try bisecting this over the next few days.
>>
>> Are you running a 32-bit userland?  If so, enabling
>> MIPS_O32_FP64_SUPPORT should fix this.
>
> ??
>
> 32-bit userland (Debian for instance) typically shouldn't need special
> "Exprimental" config options enabled.
>
> If we can identify the offending patch, we should revert it.

FYI, a fix (MIPS: asm: elf: Set O32 default FPU flags) has been posted
to linux-mips.

-- 
Måns Rullgård
mans@mansr.com

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