linux-kernel - Re: [PATCH v6 6/7] mm: Defer TLB flush by keeping both src and dst folios at migration

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Date: Tue, 16 Jan 2024 10:12:19 +0800
From: kernel test robot <lkp@...el.com>
To: Byungchul Park <byungchul@...com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Cc: oe-kbuild-all@...ts.linux.dev, kernel_team@...ynix.com,
	akpm@...ux-foundation.org, ying.huang@...el.com, namit@...are.com,
	vernhao@...cent.com, mgorman@...hsingularity.net, hughd@...gle.com,
	willy@...radead.org, david@...hat.com, peterz@...radead.org,
	luto@...nel.org, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
	dave.hansen@...ux.intel.com, rjgolo@...il.com
Subject: Re: [PATCH v6 6/7] mm: Defer TLB flush by keeping both src and dst
 folios at migration

Hi Byungchul,

kernel test robot noticed the following build errors:

[auto build test ERROR on 0dd3ee31125508cd67f7e7172247f05b7fd1753a]

url:    https://github.com/intel-lab-lkp/linux/commits/Byungchul-Park/x86-tlb-Add-APIs-manipulating-tlb-batch-s-arch-data/20240115-162220
base:   0dd3ee31125508cd67f7e7172247f05b7fd1753a
patch link:    https://lore.kernel.org/r/20240115081953.2521-7-byungchul%40sk.com
patch subject: [PATCH v6 6/7] mm: Defer TLB flush by keeping both src and dst folios at migration
config: loongarch-allmodconfig (https://download.01.org/0day-ci/archive/20240116/202401160941.4iwBnNkq-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240116/202401160941.4iwBnNkq-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401160941.4iwBnNkq-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/loongarch/include/asm/vdso.h:10,
                    from arch/loongarch/include/asm/elf.h:13,
                    from include/linux/elf.h:6,
                    from include/linux/module.h:19,
                    from lib/test_bitops.c:9:
>> include/linux/mm.h:2046:43: error: 'struct arch_tlbflush_unmap_batch' declared inside parameter list will not be visible outside of this definition or declaration [-Werror]
    2046 | static inline void migrc_flush_end(struct arch_tlbflush_unmap_batch *arch) {}
         |                                           ^~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors


vim +2046 include/linux/mm.h

  2040	
  2041	#if defined(CONFIG_MIGRATION) && defined(CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH)
  2042	extern void migrc_flush_start(void);
  2043	extern void migrc_flush_end(struct arch_tlbflush_unmap_batch *arch);
  2044	#else
  2045	static inline void migrc_flush_start(void) {}
> 2046	static inline void migrc_flush_end(struct arch_tlbflush_unmap_batch *arch) {}
  2047	#endif
  2048	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki