[PATCH v3 13/13] mm/debug_vm_pgtable: populate a pte entry before fetching it

[kernel test robot]

Hi "Aneesh,

I love your patch! Perhaps something to improve:

[auto build test WARNING on hnaz-linux-mm/master]
[also build test WARNING on powerpc/next v5.9-rc2 next-20200827]
[cannot apply to mmotm/master]
[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]

url:    https://github.com/0day-ci/linux/commits/Aneesh-Kumar-K-V/mm-debug_vm_pgtable-fixes/20200827-160758
base:   https://github.com/hnaz/linux-mm master
config: x86_64-randconfig-s022-20200827 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.2-191-g10164920-dirty
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 

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


sparse warnings: (new ones prefixed by >>)

   mm/debug_vm_pgtable.c:509:9: sparse: sparse: incompatible types in conditional expression (different base types):
   mm/debug_vm_pgtable.c:509:9: sparse:    void
   mm/debug_vm_pgtable.c:509:9: sparse:    int
   mm/debug_vm_pgtable.c:528:9: sparse: sparse: incompatible types in conditional expression (different base types):
   mm/debug_vm_pgtable.c:528:9: sparse:    void
   mm/debug_vm_pgtable.c:528:9: sparse:    int
   mm/debug_vm_pgtable.c: note: in included file (through include/linux/pgtable.h, include/linux/mm.h, include/linux/highmem.h):
>> arch/x86/include/asm/pgtable.h:587:27: sparse: sparse: context imbalance in 'debug_vm_pgtable' - unexpected unlock

# https://github.com/0day-ci/linux/commit/9370726f47eaffdf772fdc273d180ec03b245cca
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Aneesh-Kumar-K-V/mm-debug_vm_pgtable-fixes/20200827-160758
git checkout 9370726f47eaffdf772fdc273d180ec03b245cca
vim +/debug_vm_pgtable +587 arch/x86/include/asm/pgtable.h

b534816b552d35 Jeremy Fitzhardinge 2009-02-04  586  
fb43d6cb91ef57 Dave Hansen         2018-04-06 @587  static inline pgprotval_t check_pgprot(pgprot_t pgprot)
fb43d6cb91ef57 Dave Hansen         2018-04-06  588  {
fb43d6cb91ef57 Dave Hansen         2018-04-06  589  	pgprotval_t massaged_val = massage_pgprot(pgprot);
fb43d6cb91ef57 Dave Hansen         2018-04-06  590  
fb43d6cb91ef57 Dave Hansen         2018-04-06  591  	/* mmdebug.h can not be included here because of dependencies */
fb43d6cb91ef57 Dave Hansen         2018-04-06  592  #ifdef CONFIG_DEBUG_VM
fb43d6cb91ef57 Dave Hansen         2018-04-06  593  	WARN_ONCE(pgprot_val(pgprot) != massaged_val,
fb43d6cb91ef57 Dave Hansen         2018-04-06  594  		  "attempted to set unsupported pgprot: %016llx "
fb43d6cb91ef57 Dave Hansen         2018-04-06  595  		  "bits: %016llx supported: %016llx\n",
fb43d6cb91ef57 Dave Hansen         2018-04-06  596  		  (u64)pgprot_val(pgprot),
fb43d6cb91ef57 Dave Hansen         2018-04-06  597  		  (u64)pgprot_val(pgprot) ^ massaged_val,
fb43d6cb91ef57 Dave Hansen         2018-04-06  598  		  (u64)__supported_pte_mask);
fb43d6cb91ef57 Dave Hansen         2018-04-06  599  #endif
fb43d6cb91ef57 Dave Hansen         2018-04-06  600  
fb43d6cb91ef57 Dave Hansen         2018-04-06  601  	return massaged_val;
fb43d6cb91ef57 Dave Hansen         2018-04-06  602  }
fb43d6cb91ef57 Dave Hansen         2018-04-06  603  

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