gfp.h:20:32: error: redefinition of typedef 'gfp_t' is a C11 feature

[Naresh Kamboju]

arm davinci_all_defconfig config with clang 10, 11 and 12 failing
on Linux next tag 20210222 due to below listed errors / warnings.

 - arm (davinci_all_defconfig) with clang-10
 - arm (davinci_all_defconfig) with clang-11
 - arm (davinci_all_defconfig) with clang-12

make --silent --keep-going --jobs=8
O=/home/tuxbuild/.cache/tuxmake/builds/1/tmp ARCH=arm
CROSS_COMPILE=arm-linux-gnueabihf- 'HOSTCC=sccache clang' 'CC=sccache
clang' davinci_all_defconfig

make --silent --keep-going --jobs=8
O=/home/tuxbuild/.cache/tuxmake/builds/1/tmp ARCH=arm
CROSS_COMPILE=arm-linux-gnueabihf- 'HOSTCC=sccache clang' 'CC=sccache
clang'


include/linux/gfp.h:20:32: error: redefinition of typedef 'gfp_t' is a
C11 feature [-Werror,-Wtypedef-redefinition]
typedef unsigned int __bitwise gfp_t;   // repeated here for kernel-doc
                               ^
include/linux/types.h:148:32: note: previous definition is here
typedef unsigned int __bitwise gfp_t;
                               ^
1 warning generated.
1 warning generated.
1 warning generated.
1 warning generated.
1 error generated.
make[5]: *** [scripts/Makefile.build:287:
drivers/gpu/drm/tilcdc/tilcdc_plane.o] Error 1

Reported-by: Naresh Kamboju <naresh.kamboju@xxxxxxxxxx>

Step to reproduce:
---------------------------
# 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 arm --toolchain clang-10
--kconfig davinci_all_defconfig

build log,
https://builds.tuxbuild.com/1opbM56yvX4uyeXV8JBwFNz9WEQ/

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https://lkft.linaro.org