[PATCH rfc v2 01/10] mm: add a generic VMA lock-based page fault handler

[Kefeng Wang]

Hi

On 2023/8/21 23:13, kernel test robot wrote:
> Hi Kefeng,
> 
> kernel test robot noticed the following build errors:
> 
> [auto build test ERROR on next-20230821]
> [cannot apply to akpm-mm/mm-everything arm64/for-next/core tip/x86/mm s390/features powerpc/next powerpc/fixes arm/for-next arm/fixes linus/master v6.5-rc7 v6.5-rc6 v6.5-rc5 v6.5-rc7]
> [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/Kefeng-Wang/mm-add-a-generic-VMA-lock-based-page-fault-handler/20230821-203442
> base:   next-20230821
> patch link:    https://lore.kernel.org/r/20230821123056.2109942-2-wangkefeng.wang%40huawei.com
> patch subject: [PATCH rfc v2 01/10] mm: add a generic VMA lock-based page fault handler
> config: i386-tinyconfig (https://download.01.org/0day-ci/archive/20230821/202308212249.dZG3d55u-lkp@intel.com/config)
> compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
> reproduce: (https://download.01.org/0day-ci/archive/20230821/202308212249.dZG3d55u-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 at intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202308212249.dZG3d55u-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
>     In file included from include/linux/memcontrol.h:20,
>                      from include/linux/swap.h:9,
>                      from include/linux/suspend.h:5,
>                      from arch/x86/kernel/asm-offsets.c:14:
>>> include/linux/mm.h:810:38: error: redefinition of 'lock_vma_under_rcu'
>       810 | static inline struct vm_area_struct *lock_vma_under_rcu(struct mm_struct *mm,
>           |                                      ^~~~~~~~~~~~~~~~~~
>     include/linux/mm.h:794:38: note: previous definition of 'lock_vma_under_rcu' with type 'struct vm_area_struct *(struct mm_struct *, long unsigned int)'
>       794 | static inline struct vm_area_struct *lock_vma_under_rcu(struct mm_struct *mm,
>           |                                      ^~~~~~~~~~~~~~~~~~
>     make[3]: *** [scripts/Makefile.build:116: arch/x86/kernel/asm-offsets.s] Error 1
>     make[3]: Target 'prepare' not remade because of errors.
>     make[2]: *** [Makefile:1203: prepare0] Error 2
>     make[2]: Target 'prepare' not remade because of errors.
>     make[1]: *** [Makefile:234: __sub-make] Error 2
>     make[1]: Target 'prepare' not remade because of errors.
>     make: *** [Makefile:234: __sub-make] Error 2
>     make: Target 'prepare' not remade because of errors.
> 
> 

Yes, the following change should be drop as it is miscopied...

> vim +/lock_vma_under_rcu +810 include/linux/mm.h
> 
>     809	
>   > 810	static inline struct vm_area_struct *lock_vma_under_rcu(struct mm_struct *mm,
>     811			unsigned long address)
>     812	{
>     813		return NULL;
>     814	}
>     815	
>