linux-kernel - Re: [PATCH 3/4] mm: khugepaged: move mm to list tail when MADV_COLD/MADV

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Message-ID: <besdqn664ys7izgipfi5wloy4kmscosipizpbxt3hig6zvo2cz@yibkwnkitc7h>
Date: Tue, 16 Dec 2025 15:00:22 +0800
From: Vernon Yang <vernon2gm@...il.com>
To: kernel test robot <lkp@...el.com>
Cc: akpm@...ux-foundation.org, david@...nel.org, 
	lorenzo.stoakes@...cle.com, oe-kbuild-all@...ts.linux.dev, ziy@...dia.com, baohua@...nel.org, 
	lance.yang@...ux.dev, linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
	Vernon Yang <yanglincheng@...inos.cn>
Subject: Re: [PATCH 3/4] mm: khugepaged: move mm to list tail when
 MADV_COLD/MADV_FREE

On Tue, Dec 16, 2025 at 05:12:16AM +0800, kernel test robot wrote:
> Hi Vernon,
>
> kernel test robot noticed the following build errors:
>
> [auto build test ERROR on akpm-mm/mm-everything]
> [also build test ERROR on linus/master v6.19-rc1 next-20251215]
> [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/Vernon-Yang/mm-khugepaged-add-trace_mm_khugepaged_scan-event/20251215-171046
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
> patch link:    https://lore.kernel.org/r/20251215090419.174418-4-yanglincheng%40kylinos.cn
> patch subject: [PATCH 3/4] mm: khugepaged: move mm to list tail when MADV_COLD/MADV_FREE
> config: arc-allnoconfig (https://download.01.org/0day-ci/archive/20251216/202512160400.pTmarqg6-lkp@intel.com/config)
> compiler: arc-linux-gcc (GCC) 15.1.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251216/202512160400.pTmarqg6-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/202512160400.pTmarqg6-lkp@intel.com/
>
> All errors (new ones prefixed by >>):
>
>    mm/madvise.c: In function 'madvise_cold':
> >> mm/madvise.c:609:9: error: implicit declaration of function 'khugepaged_move_tail'; did you mean 'khugepaged_exit'? [-Wimplicit-function-declaration]
>      609 |         khugepaged_move_tail(vma->vm_mm);
>          |         ^~~~~~~~~~~~~~~~~~~~
>          |         khugepaged_exit

When CONFIG_TRANSPARENT_HUGEPAGE is disabled, trigger this build errors.
I'll fix it in the next version, Thanks!

>
> vim +609 mm/madvise.c
>
>    595
>    596	static long madvise_cold(struct madvise_behavior *madv_behavior)
>    597	{
>    598		struct vm_area_struct *vma = madv_behavior->vma;
>    599		struct mmu_gather tlb;
>    600
>    601		if (!can_madv_lru_vma(vma))
>    602			return -EINVAL;
>    603
>    604		lru_add_drain();
>    605		tlb_gather_mmu(&tlb, madv_behavior->mm);
>    606		madvise_cold_page_range(&tlb, madv_behavior);
>    607		tlb_finish_mmu(&tlb);
>    608
>  > 609		khugepaged_move_tail(vma->vm_mm);
>    610
>    611		return 0;
>    612	}
>    613
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki

--
Thanks,
Vernon