linux-kernel - Re: [PATCH] mm: thp: Deny THP for guest_memfd and secretmem in file_thp

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Message-ID: <202602100727.b1U4CHAA-lkp@intel.com>
Date: Tue, 10 Feb 2026 07:37:52 +0800
From: kernel test robot <lkp@...el.com>
To: Deepanshu Kartikey <kartikey406@...il.com>, akpm@...ux-foundation.org,
	david@...nel.org, lorenzo.stoakes@...cle.com,
	baolin.wang@...ux.alibaba.com, Liam.Howlett@...cle.com,
	npache@...hat.com, ryan.roberts@....com, dev.jain@....com,
	baohua@...nel.org, ackerleytng@...gle.com, seanjc@...gle.com,
	pbonzini@...hat.com, michael.roth@....com, vannapurve@...gle.com
Cc: oe-kbuild-all@...ts.linux.dev, ziy@...dia.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Deepanshu Kartikey <kartikey406@...il.com>,
	syzbot+33a04338019ac7e43a44@...kaller.appspotmail.com
Subject: Re: [PATCH] mm: thp: Deny THP for guest_memfd and secretmem in
 file_thp_enabled()

Hi Deepanshu,

kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]

url:    https://github.com/intel-lab-lkp/linux/commits/Deepanshu-Kartikey/mm-thp-Deny-THP-for-guest_memfd-and-secretmem-in-file_thp_enabled/20260209-113800
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20260209033558.22943-1-kartikey406%40gmail.com
patch subject: [PATCH] mm: thp: Deny THP for guest_memfd and secretmem in file_thp_enabled()
config: arc-randconfig-001-20260210 (https://download.01.org/0day-ci/archive/20260210/202602100727.b1U4CHAA-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 14.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260210/202602100727.b1U4CHAA-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/202602100727.b1U4CHAA-lkp@intel.com/

All errors (new ones prefixed by >>):

   mm/huge_memory.c: In function 'file_thp_enabled':
>> mm/huge_memory.c:96:37: error: 'GUEST_MEMFD_MAGIC' undeclared (first use in this function)
      96 |         if (inode->i_sb->s_magic == GUEST_MEMFD_MAGIC ||
         |                                     ^~~~~~~~~~~~~~~~~
   mm/huge_memory.c:96:37: note: each undeclared identifier is reported only once for each function it appears in
>> mm/huge_memory.c:97:37: error: 'SECRETMEM_MAGIC' undeclared (first use in this function)
      97 |             inode->i_sb->s_magic == SECRETMEM_MAGIC)
         |                                     ^~~~~~~~~~~~~~~


vim +/GUEST_MEMFD_MAGIC +96 mm/huge_memory.c

    84	
    85	static inline bool file_thp_enabled(struct vm_area_struct *vma)
    86	{
    87		struct inode *inode;
    88	
    89		if (!IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS))
    90			return false;
    91	
    92		if (!vma->vm_file)
    93			return false;
    94	
    95		inode = file_inode(vma->vm_file);
  > 96		if (inode->i_sb->s_magic == GUEST_MEMFD_MAGIC ||
  > 97		    inode->i_sb->s_magic == SECRETMEM_MAGIC)
    98			return false;
    99	
   100		return !inode_is_open_for_write(inode) && S_ISREG(inode->i_mode);
   101	}
   102	

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