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Date:   Mon, 24 Jan 2022 09:27:49 +0100
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Subject: Re: arch/s390/lib/uaccess.c:65:15: error: variable 'spec' has
 initializer but incomplete type
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To:     kernel test robot <lkp@intel.com>, Nico Boehr <nrb@linux.ibm.com>
Cc:     kbuild-all@lists.01.org, linux-kernel@vger.kernel.org,
        Heiko Carstens <hca@linux.ibm.com>
References: <202201221613.fgIWUw0F-lkp@intel.com>
From:   Janis Schoetterl-Glausch <scgl@linux.ibm.com>
In-Reply-To: <202201221613.fgIWUw0F-lkp@intel.com>
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On 1/22/22 09:42, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   9b57f458985742bd1c585f4c7f36d04634ce1143
> commit: 012a224e1fa31fc256aab921f691598e03db6018 s390/uaccess: introduce bit field for OAC specifier
> date:   5 days ago
> config: s390-randconfig-r033-20220120 (https://download.01.org/0day-ci/archive/20220122/202201221613.fgIWUw0F-lkp@intel.com/config)
> compiler: s390-linux-gcc (GCC) 11.2.0
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=012a224e1fa31fc256aab921f691598e03db6018
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout 012a224e1fa31fc256aab921f691598e03db6018
>         # save the config file to linux build tree
>         mkdir build_dir
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=s390 SHELL=/bin/bash
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@intel.com>
> 
> All errors (new ones prefixed by >>):
> 
>    arch/s390/lib/uaccess.c: In function 'copy_from_user_mvcos':
>>> arch/s390/lib/uaccess.c:65:15: error: variable 'spec' has initializer but incomplete type
>       65 |         union oac spec = {
>          |               ^~~
>>> arch/s390/lib/uaccess.c:66:18: error: 'union oac' has no member named 'oac2'
>       66 |                 .oac2.as = PSW_BITS_AS_SECONDARY,
>          |                  ^~~~
>    arch/s390/lib/uaccess.c:66:28: warning: excess elements in union initializer
>       66 |                 .oac2.as = PSW_BITS_AS_SECONDARY,
>          |                            ^~~~~~~~~~~~~~~~~~~~~
>    arch/s390/lib/uaccess.c:66:28: note: (near initialization for 'spec')
>    arch/s390/lib/uaccess.c:67:18: error: 'union oac' has no member named 'oac2'
>       67 |                 .oac2.a = 1,
>          |                  ^~~~
>    arch/s390/lib/uaccess.c:67:27: warning: excess elements in union initializer
>       67 |                 .oac2.a = 1,
>          |                           ^
>    arch/s390/lib/uaccess.c:67:27: note: (near initialization for 'spec')
>>> arch/s390/lib/uaccess.c:65:19: error: storage size of 'spec' isn't known
>       65 |         union oac spec = {
>          |                   ^~~~
>    arch/s390/lib/uaccess.c:65:19: warning: unused variable 'spec' [-Wunused-variable]
>    arch/s390/lib/uaccess.c: In function 'copy_to_user_mvcos':
>    arch/s390/lib/uaccess.c:142:15: error: variable 'spec' has initializer but incomplete type
>      142 |         union oac spec = {
>          |               ^~~
>>> arch/s390/lib/uaccess.c:143:18: error: 'union oac' has no member named 'oac1'
>      143 |                 .oac1.as = PSW_BITS_AS_SECONDARY,
>          |                  ^~~~
>    arch/s390/lib/uaccess.c:143:28: warning: excess elements in union initializer
>      143 |                 .oac1.as = PSW_BITS_AS_SECONDARY,
>          |                            ^~~~~~~~~~~~~~~~~~~~~
>    arch/s390/lib/uaccess.c:143:28: note: (near initialization for 'spec')
>    arch/s390/lib/uaccess.c:144:18: error: 'union oac' has no member named 'oac1'
>      144 |                 .oac1.a = 1,
>          |                  ^~~~
>    arch/s390/lib/uaccess.c:144:27: warning: excess elements in union initializer
>      144 |                 .oac1.a = 1,
>          |                           ^
>    arch/s390/lib/uaccess.c:144:27: note: (near initialization for 'spec')
>    arch/s390/lib/uaccess.c:142:19: error: storage size of 'spec' isn't known
>      142 |         union oac spec = {
>          |                   ^~~~
>    arch/s390/lib/uaccess.c:142:19: warning: unused variable 'spec' [-Wunused-variable]
>    arch/s390/lib/uaccess.c: In function 'clear_user_mvcos':
>    arch/s390/lib/uaccess.c:218:15: error: variable 'spec' has initializer but incomplete type
>      218 |         union oac spec = {
>          |               ^~~
>    arch/s390/lib/uaccess.c:219:18: error: 'union oac' has no member named 'oac1'
>      219 |                 .oac1.as = PSW_BITS_AS_SECONDARY,
>          |                  ^~~~
>    arch/s390/lib/uaccess.c:219:28: warning: excess elements in union initializer
>      219 |                 .oac1.as = PSW_BITS_AS_SECONDARY,
>          |                            ^~~~~~~~~~~~~~~~~~~~~
>    arch/s390/lib/uaccess.c:219:28: note: (near initialization for 'spec')
>    arch/s390/lib/uaccess.c:220:18: error: 'union oac' has no member named 'oac1'
>      220 |                 .oac1.a = 1,
>          |                  ^~~~
>    arch/s390/lib/uaccess.c:220:27: warning: excess elements in union initializer
>      220 |                 .oac1.a = 1,
>          |                           ^
>    arch/s390/lib/uaccess.c:220:27: note: (near initialization for 'spec')
>    arch/s390/lib/uaccess.c:218:19: error: storage size of 'spec' isn't known
>      218 |         union oac spec = {
>          |                   ^~~~
>    arch/s390/lib/uaccess.c:218:19: warning: unused variable 'spec' [-Wunused-variable]

This is caused by the union definition being covered by the #ifdef CONFIG_HAVE_MARCH_Z10_FEATURES.