linux-kernel - Re: [v5 6/7] mm: Defer TLB flush by keeping both src and dst folios at migration

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Date: Fri, 12 Jan 2024 02:44:30 +0800
From: kernel test robot <lkp@...el.com>
To: Byungchul Park <byungchul@...com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	kernel_team@...ynix.com, akpm@...ux-foundation.org,
	ying.huang@...el.com, namit@...are.com, xhao@...ux.alibaba.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
Subject: Re: [v5 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 akpm-mm/mm-everything]
[also build test ERROR on tip/sched/core tip/x86/core arm64/for-next/core tip/x86/mm linus/master v6.7 next-20240111]
[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/x86-tlb-Add-APIs-manipulating-tlb-batch-s-arch-data/20240111-141049
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20240111060757.13563-7-byungchul%40sk.com
patch subject: [v5 6/7] mm: Defer TLB flush by keeping both src and dst folios at migration
config: i386-allnoconfig (https://download.01.org/0day-ci/archive/20240112/202401120213.rCOV7YQI-lkp@intel.com/config)
compiler: ClangBuiltLinux clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240112/202401120213.rCOV7YQI-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/202401120213.rCOV7YQI-lkp@intel.com/

All errors (new ones prefixed by >>):

>> ld.lld: error: undefined symbol: migrc_flush_start
   >>> referenced by tlb.c
   >>>               arch/x86/mm/tlb.o:(arch_tlbbatch_flush) in archive vmlinux.a
--
>> ld.lld: error: undefined symbol: migrc_flush_end
   >>> referenced by tlb.c
   >>>               arch/x86/mm/tlb.o:(arch_tlbbatch_flush) in archive vmlinux.a
--
>> ld.lld: error: undefined symbol: migrc_flush_free_folios
   >>> referenced by memory.c
   >>>               mm/memory.o:(handle_mm_fault) in archive vmlinux.a
   >>> referenced by page_alloc.c
   >>>               mm/page_alloc.o:(get_page_from_freelist) in archive vmlinux.a

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