Re: [PATCH v3 1/7] mm: khugepaged: extract vm flag setting outside of hugepage_madvise

[kernel test robot <lkp@intel.com>]

Hi Usama,

kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]
[also build test ERROR on perf-tools-next/perf-tools-next tip/perf/core perf-tools/perf-tools linus/master acme/perf/core v6.15-rc7 next-20250516]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Usama-Arif/mm-khugepaged-extract-vm-flag-setting-outside-of-hugepage_madvise/20250520-063452
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20250519223307.3601786-2-usamaarif642%40gmail.com
patch subject: [PATCH v3 1/7] mm: khugepaged: extract vm flag setting outside of hugepage_madvise
config: s390-randconfig-002-20250520 (https://download.01.org/0day-ci/archive/20250520/202505201734.8Fyk3qKi-lkp@intel.com/config)
compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project f819f46284f2a79790038e1f6649172789734ae8)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250520/202505201734.8Fyk3qKi-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202505201734.8Fyk3qKi-lkp@intel.com/

All errors (new ones prefixed by >>):

>> mm/khugepaged.c:359:20: error: use of undeclared identifier 'vma'
     359 |                 if (mm_has_pgste(vma->vm_mm))
         |                                  ^
   1 error generated.


vim +/vma +359 mm/khugepaged.c

b46e756f5e4703 Kirill A. Shutemov 2016-07-26  348  
d2a8f83f11a4ba Usama Arif         2025-05-19  349  int hugepage_set_vmflags(unsigned long *vm_flags, int advice)
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  350  {
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  351  	switch (advice) {
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  352  	case MADV_HUGEPAGE:
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  353  #ifdef CONFIG_S390
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  354  		/*
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  355  		 * qemu blindly sets MADV_HUGEPAGE on all allocations, but s390
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  356  		 * can't handle this properly after s390_enable_sie, so we simply
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  357  		 * ignore the madvise to prevent qemu from causing a SIGSEGV.
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  358  		 */
b46e756f5e4703 Kirill A. Shutemov 2016-07-26 @359  		if (mm_has_pgste(vma->vm_mm))
d2a8f83f11a4ba Usama Arif         2025-05-19  360  			return -EPERM;
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  361  #endif
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  362  		*vm_flags &= ~VM_NOHUGEPAGE;
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  363  		*vm_flags |= VM_HUGEPAGE;
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  364  		break;
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  365  	case MADV_NOHUGEPAGE:
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  366  		*vm_flags &= ~VM_HUGEPAGE;
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  367  		*vm_flags |= VM_NOHUGEPAGE;
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  368  		/*
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  369  		 * Setting VM_NOHUGEPAGE will prevent khugepaged from scanning
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  370  		 * this vma even if we leave the mm registered in khugepaged if
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  371  		 * it got registered before VM_NOHUGEPAGE was set.
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  372  		 */
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  373  		break;
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  374  	}
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  375  
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  376  	return 0;
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  377  }
b46e756f5e4703 Kirill A. Shutemov 2016-07-26  378  

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