This might add little value.

arm build sets failed on linux next 20200721.
The defconfig ( +config fragments ) builds PASS.
The tinyconfig and allnoconfig FAILED with gcc-8, gcc-9 and gcc-10.

make -sk KBUILD_BUILD_USER=TuxBuild -C/linux -j32 ARCH=arm
CROSS_COMPILE=arm-linux-gnueabihf- HOSTCC=gcc CC="sccache
arm-linux-gnueabihf-gcc" O=build zImage
#
../arch/arm/kernel/entry-common.S: Assembler messages:
../arch/arm/kernel/entry-common.S:156: Error: r13 not allowed here --
`bic tsk,sp,#(((1<<12)<<1)-1)&~63'
../arch/arm/kernel/entry-common.S:243: Error: r13 not allowed here --
`bic tsk,sp,#(((1<<12)<<1)-1)&~63'
make[3]: *** [../scripts/Makefile.build:361:
arch/arm/kernel/entry-common.o] Error 1
../arch/arm/kernel/entry-v7m.S: Assembler messages:
../arch/arm/kernel/entry-v7m.S:60: Error: r13 not allowed here -- `bic
tsk,sp,#(((1<<12)<<1)-1)&~63'
../arch/arm/kernel/entry-v7m.S:86: Error: r13 not allowed here -- `bic
tsk,sp,#(((1<<12)<<1)-1)&~63'
make[3]: *** [../scripts/Makefile.build:361:
arch/arm/kernel/entry-v7m.o] Error 1

full build link,
https://gitlab.com/Linaro/lkft/kernel-runs/-/jobs/648560264

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

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