linux-kernel - Re: [PATCH 5.12 000/677] 5.12.4-rc1 review

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Date:   Wed, 12 May 2021 12:04:04 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     open list <linux-kernel@...r.kernel.org>,
        Shuah Khan <shuah@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>, patches@...nelci.org,
        lkft-triage@...ts.linaro.org, Jon Hunter <jonathanh@...dia.com>,
        linux-stable <stable@...r.kernel.org>,
        Pavel Machek <pavel@...x.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        "Maciej W. Rozycki" <macro@...am.me.uk>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Huacai Chen <chenhuacai@...nel.org>
Subject: Re: [PATCH 5.12 000/677] 5.12.4-rc1 review

On 5/12/2021 11:51 AM, Greg Kroah-Hartman wrote:
> On Thu, May 13, 2021 at 12:18:32AM +0530, Naresh Kamboju wrote:
>> On Wed, 12 May 2021 at 23:26, Greg Kroah-Hartman
>> <gregkh@...uxfoundation.org> wrote:
>>>
>>> On Wed, May 12, 2021 at 10:53:04PM +0530, Naresh Kamboju wrote:
>>>> On Wed, 12 May 2021 at 21:27, Greg Kroah-Hartman
>>>> <gregkh@...uxfoundation.org> wrote:
>>>>>
>>>>> This is the start of the stable review cycle for the 5.12.4 release.
>>>>> There are 677 patches in this series, all will be posted as a response
>>>>> to this one.  If anyone has any issues with these being applied, please
>>>>> let me know.
>>>>>
>>>>> Responses should be made by Fri, 14 May 2021 14:47:09 +0000.
>>>>> Anything received after that time might be too late.
>>>>>
>>>>> The whole patch series can be found in one patch at:
>>>>>          https://www.kernel.org/pub/linux/kernel/v5.x/stable-review/patch-5.12.4-rc1.gz
>>>>> or in the git tree and branch at:
>>>>>          git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.12.y
>>>>> and the diffstat can be found below.
>>>>>
>>>>> thanks,
>>>>>
>>>>> greg k-h
>>>>
>>>>
>>>> MIPS Clang build regression detected.
>>>> MIPS gcc-10,9 and 8 build PASS.
>>>>
>>>>> Maciej W. Rozycki <macro@...am.me.uk>
>>>>>      MIPS: Reinstate platform `__div64_32' handler
>>>>
>>>> mips clang build breaks on stable rc 5.4 .. 5.12 due to below warnings / errors
>>>>   - mips (defconfig) with clang-12
>>>>   - mips (tinyconfig) with clang-12
>>>>   - mips (allnoconfig) with clang-12
>>>>
>>>> make --silent --keep-going --jobs=8
>>>> O=/home/tuxbuild/.cache/tuxmake/builds/current ARCH=mips
>>>> CROSS_COMPILE=mips-linux-gnu- 'HOSTCC=sccache clang' 'CC=sccache
>>>> clang'
>>>> kernel/time/hrtimer.c:318:2: error: couldn't allocate output register
>>>> for constraint 'x'
>>>>          do_div(tmp, (u32) div);
>>>>          ^
>>>> include/asm-generic/div64.h:243:11: note: expanded from macro 'do_div'
>>>>                  __rem = __div64_32(&(n), __base);       \
>>>>                          ^
>>>> arch/mips/include/asm/div64.h:74:11: note: expanded from macro '__div64_32'
>>>>                  __asm__("divu   $0, %z1, %z2"                           \
>>>>                          ^
>>>> 1 error generated.
>>>
>>> Does this also show up in Linus's tree?  The same MIPS patch is there as
>>> well from what I can tell.
>>
>> No.
>> Linus's tree builds MIPS clang successfully.
> 
> Ick, ok, I'll go drop this and let a MIPS developer send us the correct
> thing.
> 
> thanks!
> 
> greg k-h
> 

I think you just need to grab commits c1d337d45ec0 ("MIPS: Avoid DIVU in 
`__div64_32' is result would be zero") and 25ab14cbe9d1 ("MIPS: Avoid 
handcoded DIVU in `__div64_32' altogether") to fix this up.

Cheers,
Nathan