Re: [PATCH 2/2] kbuild: move -Wundef from KBUILD_CFLAGS to KBUILD_CPPFLAGS

[kernel test robot]

Hi Masahiro,

I love your patch! Perhaps something to improve:

[auto build test WARNING on masahiroy-kbuild/for-next]
[also build test WARNING on linus/master v6.0-rc5]
[cannot apply to next-20220909]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Masahiro-Yamada/kbuild-move-Werror-from-KBUILD_CFLAGS-to-KBUILD_CPPFLAGS/20220905-164209
base:   https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git for-next
config: s390-randconfig-s052-20220911 (https://download.01.org/0day-ci/archive/20220912/202209121730.ipnGRE83-lkp@xxxxxxxxx/config)
compiler: s390-linux-gcc (GCC) 12.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://github.com/intel-lab-lkp/linux/commit/2f8ee1865d7d00ad27460d94056c7752cad8481f
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Masahiro-Yamada/kbuild-move-Werror-from-KBUILD_CFLAGS-to-KBUILD_CPPFLAGS/20220905-164209
        git checkout 2f8ee1865d7d00ad27460d94056c7752cad8481f
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=s390 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

sparse warnings: (new ones prefixed by >>)
>> arch/s390/boot/decompressor.c:28:7: sparse: sparse: undefined preprocessor identifier 'CONFIG_KERNEL_ZSTD'

vim +/CONFIG_KERNEL_ZSTD +28 arch/s390/boot/decompressor.c

1844c9bc0b2fed arch/s390/boot/compressed/misc.c         Martin Schwidefsky  2010-02-26  25  
54f45214522ae7 arch/s390/boot/compressed/decompressor.c Vasily Gorbik       2021-06-16  26  #ifdef CONFIG_KERNEL_BZIP2
1b3e3faf29d3ac arch/s390/boot/compressed/decompressor.c Mikhail Zaslonko    2020-01-30  27  #define BOOT_HEAP_SIZE	0x400000
7b034d9c1b08b3 arch/s390/boot/compressed/decompressor.c Dimitri John Ledkov 2021-06-15 @28  #elif CONFIG_KERNEL_ZSTD
7b034d9c1b08b3 arch/s390/boot/compressed/decompressor.c Dimitri John Ledkov 2021-06-15  29  #define BOOT_HEAP_SIZE	0x30000
1844c9bc0b2fed arch/s390/boot/compressed/misc.c         Martin Schwidefsky  2010-02-26  30  #else
1b3e3faf29d3ac arch/s390/boot/compressed/decompressor.c Mikhail Zaslonko    2020-01-30  31  #define BOOT_HEAP_SIZE	0x10000
1844c9bc0b2fed arch/s390/boot/compressed/misc.c         Martin Schwidefsky  2010-02-26  32  #endif
1844c9bc0b2fed arch/s390/boot/compressed/misc.c         Martin Schwidefsky  2010-02-26  33  

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