[intel-linux-intel-lts:4.19/android_r 20723/22085] include/linux/page-flags-layout.h:95:2: error: #error "Not enough bits in page flags"

[intel-linux-intel-lts:4.19/android_r 20723/22085] include/linux/page-flags-layout.h:95:2: error: #error "Not enough bits in page flags"

[kernel test robot]

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tree:   https://github.com/intel/linux-intel-lts.git 4.19/android_r
head:   42da0a5bc28f55c05347ef8eb88d9e41f369333e
commit: 7783c5c8ec0d6781dc180be5fd075f06f90e9cb5 [20723/22085] UPSTREAM: page flags: prioritize kasan bits over last-cpuid
config: mips-lemote2f_defconfig (attached as .config)
compiler: mips64el-linux-gcc (GCC) 9.3.0
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://github.com/intel/linux-intel-lts/commit/7783c5c8ec0d6781dc180be5fd075f06f90e9cb5
        git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git
        git fetch --no-tags intel-linux-intel-lts 4.19/android_r
        git checkout 7783c5c8ec0d6781dc180be5fd075f06f90e9cb5
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips 

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 >>):

   In file included from include/linux/mm_types.h:15,
                    from arch/mips/include/asm/vdso.h:14,
                    from arch/mips/include/asm/vdso/vdso.h:28,
                    from arch/mips/include/asm/vdso/gettimeofday.h:16,
                    from include/vdso/datapage.h:114,
                    from lib/vdso/gettimeofday.c:5,
                    from <command-line>:
>> include/linux/page-flags-layout.h:95:2: error: #error "Not enough bits in page flags"
      95 | #error "Not enough bits in page flags"
         |  ^~~~~
   In file included from include/vdso/datapage.h:114,
                    from lib/vdso/gettimeofday.c:5,
                    from <command-line>:
   arch/mips/include/asm/vdso/gettimeofday.h: In function 'clock_gettime_fallback':
   arch/mips/include/asm/vdso/gettimeofday.h:55:31: error: '__NR_clock_gettime64' undeclared (first use in this function)
      55 |  register long nr asm("v0") = __NR_clock_gettime64;
         |                               ^~~~~~~~~~~~~~~~~~~~
   arch/mips/include/asm/vdso/gettimeofday.h:55:31: note: each undeclared identifier is reported only once for each function it appears in
   arch/mips/include/asm/vdso/gettimeofday.h: In function 'clock_getres_fallback':
   arch/mips/include/asm/vdso/gettimeofday.h:79:31: error: '__NR_clock_getres_time64' undeclared (first use in this function)
      79 |  register long nr asm("v0") = __NR_clock_getres_time64;
         |                               ^~~~~~~~~~~~~~~~~~~~~~~~
   arch/mips/vdso/vgettimeofday.c: At top level:
   arch/mips/vdso/vgettimeofday.c:14:5: warning: no previous prototype for '__vdso_clock_gettime' [-Wmissing-prototypes]
      14 | int __vdso_clock_gettime(clockid_t clock,
         |     ^~~~~~~~~~~~~~~~~~~~
   arch/mips/vdso/vgettimeofday.c:28:5: warning: no previous prototype for '__vdso_gettimeofday' [-Wmissing-prototypes]
      28 | int __vdso_gettimeofday(struct __kernel_old_timeval *tv,
         |     ^~~~~~~~~~~~~~~~~~~
   arch/mips/vdso/vgettimeofday.c:36:5: warning: no previous prototype for '__vdso_clock_getres' [-Wmissing-prototypes]
      36 | int __vdso_clock_getres(clockid_t clock_id,
         |     ^~~~~~~~~~~~~~~~~~~
   arch/mips/vdso/vgettimeofday.c:42:5: warning: no previous prototype for '__vdso_clock_gettime64' [-Wmissing-prototypes]
      42 | int __vdso_clock_gettime64(clockid_t clock,
         |     ^~~~~~~~~~~~~~~~~~~~~~


vim +95 include/linux/page-flags-layout.h

    92	
    93	#if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH+LAST_CPUPID_WIDTH+KASAN_TAG_WIDTH \
    94		> BITS_PER_LONG - NR_PAGEFLAGS
  > 95	#error "Not enough bits in page flags"
    96	#endif
    97	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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Re: [intel-linux-intel-lts:4.19/android_r 20723/22085] include/linux/page-flags-layout.h:95:2: error: #error "Not enough bits in page flags"

[Arnd Bergmann]

On Tue, Mar 9, 2021 at 4:00 PM kernel test robot <lkp@intel.com> wrote:
>
> tree:   https://github.com/intel/linux-intel-lts.git 4.19/android_r
> head:   42da0a5bc28f55c05347ef8eb88d9e41f369333e
> commit: 7783c5c8ec0d6781dc180be5fd075f06f90e9cb5 [20723/22085] UPSTREAM: page flags: prioritize kasan bits over last-cpuid
> config: mips-lemote2f_defconfig (attached as .config)
> compiler: mips64el-linux-gcc (GCC) 9.3.0
> 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://github.com/intel/linux-intel-lts/commit/7783c5c8ec0d6781dc180be5fd075f06f90e9cb5
>         git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git
>         git fetch --no-tags intel-linux-intel-lts 4.19/android_r
>         git checkout 7783c5c8ec0d6781dc180be5fd075f06f90e9cb5
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips
>
> 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 >>):
>
>    In file included from include/linux/mm_types.h:15,
>                     from arch/mips/include/asm/vdso.h:14,
>                     from arch/mips/include/asm/vdso/vdso.h:28,
>                     from arch/mips/include/asm/vdso/gettimeofday.h:16,
>                     from include/vdso/datapage.h:114,
>                     from lib/vdso/gettimeofday.c:5,
>                     from <command-line>:
> >> include/linux/page-flags-layout.h:95:2: error: #error "Not enough bits in page flags"

I think this happens because my patch fixed an error that happened on
multiple architectures but did not fix the mips specific error that remains.

I once tried fixing this as well, but there is no good way to express the
requirements in Kconfig -- there are simply not enough bits in the
page flags to allow all combinations that can happen in randconfig
builds.

       Arnd