Re: [v4 2/3] mm: Defer TLB flush by keeping both src and dst folios at migration

[kernel test robot]

Hi Byungchul,

kernel test robot noticed the following build errors:

[auto build test ERROR on tip/sched/core]
[also build test ERROR on tip/x86/core tip/x86/mm v6.6]
[cannot apply to akpm-mm/mm-everything linus/master next-20231109]
[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/Byungchul-Park/mm-rmap-Recognize-read-only-TLB-entries-during-batched-TLB-flush/20231109-163706
base:   tip/sched/core
patch link:    https://lore.kernel.org/r/20231109045908.54996-3-byungchul%40sk.com
patch subject: [v4 2/3] mm: Defer TLB flush by keeping both src and dst folios at migration
config: um-allnoconfig (https://download.01.org/0day-ci/archive/20231110/202311100211.UAqu6dj7-lkp@xxxxxxxxx/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231110/202311100211.UAqu6dj7-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311100211.UAqu6dj7-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

   In file included from arch/um/kernel/asm-offsets.c:1:
   In file included from arch/x86/um/shared/sysdep/kernel-offsets.h:5:
   In file included from include/linux/crypto.h:17:
   In file included from include/linux/slab.h:16:
   In file included from include/linux/gfp.h:7:
   In file included from include/linux/mmzone.h:22:
>> include/linux/mm_types.h:1416:35: error: field has incomplete type 'struct arch_tlbflush_unmap_batch'
    1416 |         struct arch_tlbflush_unmap_batch arch;
         |                                          ^
   include/linux/mm_types.h:1416:9: note: forward declaration of 'struct arch_tlbflush_unmap_batch'
    1416 |         struct arch_tlbflush_unmap_batch arch;
         |                ^
   In file included from arch/um/kernel/asm-offsets.c:1:
   arch/x86/um/shared/sysdep/kernel-offsets.h:9:6: warning: no previous prototype for function 'foo' [-Wmissing-prototypes]
       9 | void foo(void)
         |      ^
   arch/x86/um/shared/sysdep/kernel-offsets.h:9:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
       9 | void foo(void)
         | ^
         | static 
   1 warning and 1 error generated.
   make[3]: *** [scripts/Makefile.build:116: arch/um/kernel/asm-offsets.s] Error 1
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1202: 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.


vim +1416 include/linux/mm_types.h

  1401	
  1402	struct migrc_req {
  1403		/*
  1404		 * folios pending for TLB flush
  1405		 */
  1406		struct list_head folios;
  1407	
  1408		/*
  1409		 * for hanging to the associated numa node
  1410		 */
  1411		struct llist_node llnode;
  1412	
  1413		/*
  1414		 * architecture specific data for batched TLB flush
  1415		 */
> 1416		struct arch_tlbflush_unmap_batch arch;

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