[moderation/CI] Re: Improve khugepaged scan logic

[syzbot ci <syzbot+ci25e9803aeb356e4a@syzkaller.appspotmail.com>]

syzbot ci has tested the following series

[v1] Improve khugepaged scan logic
https://lore.kernel.org/all/20251215090419.174418-1-yanglincheng@kylinos.cn
* [PATCH 1/4] mm: khugepaged: add trace_mm_khugepaged_scan event
* [PATCH 2/4] mm: khugepaged: remove mm when all memory has been collapsed
* [PATCH 3/4] mm: khugepaged: move mm to list tail when MADV_COLD/MADV_FREE
* [PATCH 4/4] mm: khugepaged: set to next mm direct when mm has MMF_DISABLE_THP_COMPLETELY

and found the following issue:
kernel build error

Full report is available here:
https://ci.syzbot.org/series/6c67be4d-245c-468c-977f-a76d79039a9b

***

kernel build error

tree:      mm-new
URL:       https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git
base:      db411a1da7e162908fd11d5d8780e1f9c7fdff65
arch:      amd64
compiler:  Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
config:    https://ci.syzbot.org/builds/86d1ae0e-f606-44a7-9c85-9e09254f0704/config

mm/khugepaged.c:2509:9: error: use of undeclared identifier 'SCAN_PMD_NULL'; did you mean 'SCAN_VMA_NULL'?
mm/khugepaged.c:2510:9: error: use of undeclared identifier 'SCAN_PMD_NONE'

***

If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
  Tested-by: syzbot@syzkaller.appspotmail.com

---
This report is generated by a bot. It may contain errors.
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The email will later be sent to:
[akpm@linux-foundation.org baohua@kernel.org david@kernel.org lance.yang@linux.dev linux-kernel@vger.kernel.org linux-mm@kvack.org lorenzo.stoakes@oracle.com npache@redhat.com vernon2gm@gmail.com yanglincheng@kylinos.cn ziy@nvidia.com]

If the report looks fine to you, reply with:
#syz upstream