Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Subject: Re: [PATCH 5.12 000/677] 5.12.4-rc1 review
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Naresh Kamboju <naresh.kamboju@linaro.org>
Cc:     open list <linux-kernel@vger.kernel.org>,
        Shuah Khan <shuah@kernel.org>,
        Florian Fainelli <f.fainelli@gmail.com>, patches@kernelci.org,
        lkft-triage@lists.linaro.org, Jon Hunter <jonathanh@nvidia.com>,
        linux-stable <stable@vger.kernel.org>,
        Pavel Machek <pavel@denx.de>,
        Andrew Morton <akpm@linux-foundation.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Guenter Roeck <linux@roeck-us.net>,
        clang-built-linux <clang-built-linux@googlegroups.com>,
        "Maciej W. Rozycki" <macro@orcam.me.uk>,
        Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
        Huacai Chen <chenhuacai@kernel.org>
References: <20210512144837.204217980@linuxfoundation.org>
 <CA+G9fYufHvM+C=39gtk5CF-r4sYYpRkQFGsmKrkdQcXj_XKFag@mail.gmail.com>
 <YJwW2bNXGZw5kmpo@kroah.com>
 <CA+G9fYvbe9L=3uJk2+5fR_e2-fnw=UXSDRnHh+u3nMFeOjOwjg@mail.gmail.com>
 <YJwjuJrYiyS/eeR8@kroah.com>
From:   Nathan Chancellor <nathan@kernel.org>
Message-ID: <8615959b-9054-5c9f-0afa-f15672274d12@kernel.org>
Date:   Wed, 12 May 2021 12:04:04 -0700
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101
 Thunderbird/78.10.1
MIME-Version: 1.0
In-Reply-To: <YJwjuJrYiyS/eeR8@kroah.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Precedence: bulk

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@linuxfoundation.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@linuxfoundation.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@orcam.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