Re: [PATCH v2 09/12] mm/vm_debug_pgtable: Use struct pgtable_debug_args in PUD modifying tests

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Hi Gavin,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.14-rc2]
[cannot apply to hnaz-linux-mm/master linux/master next-20210719]
[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/Gavin-Shan/mm-debug_vm_pgtable-Enhancements/20210719-134236
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 2734d6c1b1a089fb593ef6a23d4b70903526fe0c
config: x86_64-randconfig-c002-20210719 (attached as .config)
compiler: gcc-10 (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/69db26024e6bd48423ebc83b0f83b7b52217b624
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Gavin-Shan/mm-debug_vm_pgtable-Enhancements/20210719-134236
        git checkout 69db26024e6bd48423ebc83b0f83b7b52217b624
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

   mm/debug_vm_pgtable.c: In function 'pud_huge_tests':
>> mm/debug_vm_pgtable.c:445:8: warning: variable 'pud' set but not used [-Wunused-but-set-variable]
     445 |  pud_t pud;
         |        ^~~
   mm/debug_vm_pgtable.c: In function 'debug_vm_pgtable':
   mm/debug_vm_pgtable.c:1143:42: warning: variable 'pgd_aligned' set but not used [-Wunused-but-set-variable]
    1143 |  unsigned long pud_aligned, p4d_aligned, pgd_aligned;
         |                                          ^~~~~~~~~~~
   mm/debug_vm_pgtable.c:1143:29: warning: variable 'p4d_aligned' set but not used [-Wunused-but-set-variable]
    1143 |  unsigned long pud_aligned, p4d_aligned, pgd_aligned;
         |                             ^~~~~~~~~~~
   mm/debug_vm_pgtable.c:1143:16: warning: variable 'pud_aligned' set but not used [-Wunused-but-set-variable]
    1143 |  unsigned long pud_aligned, p4d_aligned, pgd_aligned;
         |                ^~~~~~~~~~~
   mm/debug_vm_pgtable.c:1142:36: warning: variable 'pmd_aligned' set but not used [-Wunused-but-set-variable]
    1142 |  unsigned long vaddr, pte_aligned, pmd_aligned;
         |                                    ^~~~~~~~~~~
   mm/debug_vm_pgtable.c:1140:17: warning: variable 'protnone' set but not used [-Wunused-but-set-variable]
    1140 |  pgprot_t prot, protnone;
         |                 ^~~~~~~~
   mm/debug_vm_pgtable.c:1140:11: warning: variable 'prot' set but not used [-Wunused-but-set-variable]
    1140 |  pgprot_t prot, protnone;
         |           ^~~~


vim +/pud +445 mm/debug_vm_pgtable.c

5fe77be6bf14bf Shixin Liu        2021-06-30  442  
69db26024e6bd4 Gavin Shan        2021-07-19  443  static void __init pud_huge_tests(struct pgtable_debug_args *args)
a5c3b9ffb0f404 Anshuman Khandual 2020-08-06  444  {
5fe77be6bf14bf Shixin Liu        2021-06-30 @445  	pud_t pud;
5fe77be6bf14bf Shixin Liu        2021-06-30  446  
69db26024e6bd4 Gavin Shan        2021-07-19  447  	if (!arch_vmap_pud_supported(args->page_prot))
5fe77be6bf14bf Shixin Liu        2021-06-30  448  		return;
5fe77be6bf14bf Shixin Liu        2021-06-30  449  
5fe77be6bf14bf Shixin Liu        2021-06-30  450  	pr_debug("Validating PUD huge\n");
5fe77be6bf14bf Shixin Liu        2021-06-30  451  	/*
5fe77be6bf14bf Shixin Liu        2021-06-30  452  	 * X86 defined pud_set_huge() verifies that the given
5fe77be6bf14bf Shixin Liu        2021-06-30  453  	 * PUD is not a populated non-leaf entry.
5fe77be6bf14bf Shixin Liu        2021-06-30  454  	 */
69db26024e6bd4 Gavin Shan        2021-07-19  455  	WRITE_ONCE(*(args->pudp), __pud(0));
69db26024e6bd4 Gavin Shan        2021-07-19  456  	WARN_ON(!pud_set_huge(args->pudp, __pfn_to_phys(args->fixed_pud_pfn),
69db26024e6bd4 Gavin Shan        2021-07-19  457  			      args->page_prot));
69db26024e6bd4 Gavin Shan        2021-07-19  458  	WARN_ON(!pud_clear_huge(args->pudp));
69db26024e6bd4 Gavin Shan        2021-07-19  459  	pud = READ_ONCE(*(args->pudp));
a5c3b9ffb0f404 Anshuman Khandual 2020-08-06  460  }
5fe77be6bf14bf Shixin Liu        2021-06-30  461  #else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */
54b1f4b50ddb0f Gavin Shan        2021-07-19  462  static void __init pmd_huge_tests(struct pgtable_debug_args *args) { }
69db26024e6bd4 Gavin Shan        2021-07-19  463  static void __init pud_huge_tests(struct pgtable_debug_args *args) { }
5fe77be6bf14bf Shixin Liu        2021-06-30  464  #endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */
399145f9eb6c67 Anshuman Khandual 2020-06-04  465  

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

Attachment: .config.gz
Description: application/gzip


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