https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org/thread/DP3VC6U37LJ2QKP6JAIMVX7NVEZCU3Q2/

Hi Zou,

First bad commit (maybe != root cause):

tree:   https://github.com/alibaba/cloud-kernel.git linux-next
head:   c3ac3c331d6cc495be9603404799c061d71af44c
commit: db153a10baa44eb31fce8c5459dfef6722f34e56 [10926/12249] alinux: hookers: add arm64 dependency
config: arm64-randconfig-r031-20200928 (attached as .config)
compiler: aarch64-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/alibaba/cloud-kernel/commit/db153a10baa44eb31fce8c5459dfef6722f34e56
        git remote add alibaba-cloud https://github.com/alibaba/cloud-kernel.git
        git fetch --no-tags alibaba-cloud linux-next
        git checkout db153a10baa44eb31fce8c5459dfef6722f34e56
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   net/hookers/hookers.c: In function 'remove_memprotect':
>> net/hookers/hookers.c:281:14: warning: variable 'pudd' set but not used [-Wunused-but-set-variable]
     281 |  pud_t *pud, pudd;
         |              ^~~~
>> net/hookers/hookers.c:280:14: warning: variable 'pgdd' set but not used [-Wunused-but-set-variable]
     280 |  pgd_t *pgd, pgdd;
         |              ^~~~
   net/hookers/hookers.c: In function 'set_memprotect':
   net/hookers/hookers.c:303:14: warning: variable 'pudd' set but not used [-Wunused-but-set-variable]
     303 |  pud_t *pud, pudd;
         |              ^~~~
   net/hookers/hookers.c:302:14: warning: variable 'pgdd' set but not used [-Wunused-but-set-variable]
     302 |  pgd_t *pgd, pgdd;
         |              ^~~~

vim +/pudd +281 net/hookers/hookers.c

bc56b7b3e8d79e Zou Cao 2019-12-01  277  
bc56b7b3e8d79e Zou Cao 2019-12-01  278  static void remove_memprotect(unsigned long addr)
bc56b7b3e8d79e Zou Cao 2019-12-01  279  {
bc56b7b3e8d79e Zou Cao 2019-12-01 @280  	pgd_t *pgd, pgdd;
bc56b7b3e8d79e Zou Cao 2019-12-01 @281  	pud_t *pud, pudd;
bc56b7b3e8d79e Zou Cao 2019-12-01  282  	pmd_t *pmd, pmdd;
bc56b7b3e8d79e Zou Cao 2019-12-01  283  	u64 addr_aligned;
bc56b7b3e8d79e Zou Cao 2019-12-01  284  
bc56b7b3e8d79e Zou Cao 2019-12-01  285  	addr_aligned = addr & PAGE_MASK;
bc56b7b3e8d79e Zou Cao 2019-12-01  286  
bc56b7b3e8d79e Zou Cao 2019-12-01  287  	pgd = pgd_offset(orig_init_mm, (unsigned long)addr_aligned);
bc56b7b3e8d79e Zou Cao 2019-12-01  288  	pgdd = READ_ONCE(*pgd);
bc56b7b3e8d79e Zou Cao 2019-12-01  289  
bc56b7b3e8d79e Zou Cao 2019-12-01  290  	pud = pud_offset(pgd, (unsigned long)addr_aligned);
bc56b7b3e8d79e Zou Cao 2019-12-01  291  	pudd = READ_ONCE(*pud);
bc56b7b3e8d79e Zou Cao 2019-12-01  292  
bc56b7b3e8d79e Zou Cao 2019-12-01  293  	pmd = pmd_offset(pud, (unsigned long)addr_aligned);
bc56b7b3e8d79e Zou Cao 2019-12-01  294  	pmdd = READ_ONCE(*pmd);
bc56b7b3e8d79e Zou Cao 2019-12-01  295  
bc56b7b3e8d79e Zou Cao 2019-12-01  296  	set_pmd(pmd, __pmd(pmd_val(pmdd) & ~PMD_SECT_RDONLY));
bc56b7b3e8d79e Zou Cao 2019-12-01  297  	flush_tlb_kernel_range(addr_aligned, addr_aligned + PAGE_SIZE);
bc56b7b3e8d79e Zou Cao 2019-12-01  298  }
bc56b7b3e8d79e Zou Cao 2019-12-01  299  

:::::: The code at line 281 was first introduced by commit
:::::: bc56b7b3e8d79e0d75ed0d19e7e128093f355b18 alinux: Hookers: add arm64 support

:::::: TO: Zou Cao <zoucao@linux.alibaba.com>
:::::: CC: Shile Zhang <shile.zhang@linux.alibaba.com>

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