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

[Naresh Kamboju]

On Wed, 12 May 2021 at 21:27, Greg Kroah-Hartman
<gregkh@xxxxxxxxxxxxxxxxxxx> 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@xxxxxxxxxxx>
>     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.

Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx>

steps to reproduce:
--------------------------
#!/bin/sh

# TuxMake is a command line tool and Python library that provides
# portable and repeatable Linux kernel builds across a variety of
# architectures, toolchains, kernel configurations, and make targets.
#
# TuxMake supports the concept of runtimes.
# See https://docs.tuxmake.org/runtimes/, for that to work it requires
# that you install podman or docker on your system.
#
# To install tuxmake on your system globally:
# sudo pip3 install -U tuxmake
#
# See https://docs.tuxmake.org/ for complete documentation.

tuxmake --runtime podman --target-arch mips --toolchain clang-12
--kconfig defconfig

build ref:
https://builds.tuxbuild.com/1sRW8pJDUO08LLScNJnPlFqm8lV/

--
Linaro LKFT
https://lkft.linaro.org