Re: [PATCH 3/3] mm: check for VMA being detached before destroying it

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

Hi Suren,

kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]

url:    https://github.com/intel-lab-lkp/linux/commits/Suren-Baghdasaryan/mm-change-vma_start_read-to-fail-to-lock-a-detached-VMA/20230621-075833
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20230620235726.3873043-3-surenb%40google.com
patch subject: [PATCH 3/3] mm: check for VMA being detached before destroying it
config: alpha-allyesconfig (https://download.01.org/0day-ci/archive/20230621/202306211007.hQoEsMrP-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230621/202306211007.hQoEsMrP-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/202306211007.hQoEsMrP-lkp@intel.com/

All errors (new ones prefixed by >>):

   scripts/genksyms/parse.y: warning: 9 shift/reduce conflicts [-Wconflicts-sr]
   scripts/genksyms/parse.y: warning: 5 reduce/reduce conflicts [-Wconflicts-rr]
   scripts/genksyms/parse.y: note: rerun with option '-Wcounterexamples' to generate conflict counterexamples
   In file included from include/linux/pid_namespace.h:7,
                    from include/linux/ptrace.h:10,
                    from arch/alpha/kernel/asm-offsets.c:11:
   include/linux/mm.h: In function 'vma_init':
>> include/linux/mm.h:753:12: error: 'struct vm_area_struct' has no member named 'detached'
     753 |         vma->detached = true;
         |            ^~
   arch/alpha/kernel/asm-offsets.c: At top level:
   arch/alpha/kernel/asm-offsets.c:15:6: warning: no previous prototype for 'foo' [-Wmissing-prototypes]
      15 | void foo(void)
         |      ^~~
   make[2]: *** [scripts/Makefile.build:114: arch/alpha/kernel/asm-offsets.s] Error 1
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:1287: prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:226: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +753 include/linux/mm.h

   740	
   741	/*
   742	 * WARNING: vma_init does not initialize vma->vm_lock.
   743	 * Use vm_area_alloc()/vm_area_free() if vma needs locking.
   744	 */
   745	static inline void vma_init(struct vm_area_struct *vma, struct mm_struct *mm)
   746	{
   747		static const struct vm_operations_struct dummy_vm_ops = {};
   748	
   749		memset(vma, 0, sizeof(*vma));
   750		vma->vm_mm = mm;
   751		vma->vm_ops = &dummy_vm_ops;
   752		INIT_LIST_HEAD(&vma->anon_vma_chain);
 > 753		vma->detached = true;
   754		vma_numab_state_init(vma);
   755	}
   756	

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