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List: freebsd-arm
Subject: Re: FYI: artifact-based head bisect and OPi+2e (an armv7): -r359311 fails to boot but -r359309 boots
From: Mark Millard via freebsd-arm <freebsd-arm () freebsd ! org>
Date: 2020-04-02 3:03:25
Message-ID: F4EBDF0F-24DC-47FD-9177-5BC407AFA39F () yahoo ! com
[Download RAW message or body]
On 2020-Mar-29, at 10:58, Ian Lepore <ian@freebsd.org> wrote:
> On Sun, 2020-03-29 at 09:44 -0700, Thomas Skibo wrote:
>> On Sun, Mar 29, 2020 at 12:29:00AM -0700, Mark Millard via freebsd-
>> arm wrote:
>>> While trying to update the head version
>>> in use I ran into boot hangups on the
>>> OrangePi+ 2e and did an approximate
>>> bisect of artificact.freebsd.org kernels
>>> to find approximately which kernel
>>> version the issue started at.
>>>
>>> I found that head -r359309 boots and
>>> -r359311 fails (shown later below).
>>> The original update attempt was from
>>> -r359966 to -r359376 and -r359376
>>> stopped there as well. (I kept world
>>> there and varied the kernel version
>>> for the approximate bisect activity.)
>>>
>>> It seems that at least one of the
>>> "MI-namespace" atomics added do not work
>>> in all its usage-contexts on the cortexA7
>>> (armv7) involved.
>>
>> It looks like my previous reply didn't go to the mailing lists. I'm
>> new to
>> mutt.
>>
>> Anyway, I looked at this problem yesterday and it seems r359311
>> enables
>> using some atomic operations that were not being used until now. In
>> particular, atomic_fcmpset_8() seems broken and hangs up
>> in vm_page_bits_swap(). I think I have a fix but I want to run it
>> by Ian.
>>
>> --Thomas
>>
>> Index: sys/arm/include/atomic-v6.h
>> ===================================================================
>> --- sys/arm/include/atomic-v6.h (revision 359412)
>> +++ sys/arm/include/atomic-v6.h (working copy)
>> @@ -196,7 +196,7 @@
>> \
>> __asm __volatile( \
>> "1: ldrex" SUF " %[tmp], [%[ptr]] \n" \
>> - " ldr %[ret], [%[oldv]] \n" \
>> + " ldr" SUF " %[ret], [%[oldv]] \n" \
>> " teq %[tmp], %[ret] \n" \
>> " ittee ne \n" \
>> " str" SUF "ne %[tmp], [%[oldv]] \n" \
>>
>
>
> I've committed this fix as r359423, thanks!
Thanks to both of you: the OPi+2e boots just fine
now and has been operating like it used to (head
-r359427 in use).
===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)
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