linux-kernel - Re: [PATCH v2 08/10] mm/vma: Use unmap_desc in exit_mmap() and vms_clear

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Message-ID: <202601160925.VR8a2hUw-lkp@intel.com>
Date: Fri, 16 Jan 2026 10:04:27 +0800
From: kernel test robot <lkp@...el.com>
To: "Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc: oe-kbuild-all@...ts.linux.dev,
	Linux Memory Management List <linux-mm@...ck.org>,
	linux-kernel@...r.kernel.org,
	Suren Baghdasaryan <surenb@...gle.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Pedro Falcato <pfalcato@...e.de>,
	David Hildenbrand <david@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>, Michal Hocko <mhocko@...e.com>,
	Jann Horn <jannh@...gle.com>, shikemeng@...weicloud.com,
	kasong@...cent.com, nphamcs@...il.com, bhe@...hat.com,
	baohua@...nel.org, chrisl@...nel.org,
	Matthew Wilcox <willy@...radead.org>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>
Subject: Re: [PATCH v2 08/10] mm/vma: Use unmap_desc in exit_mmap() and
 vms_clear_ptes()

Hi Liam,

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-rc5 next-20260115]
[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/Liam-R-Howlett/mm-mmap-Move-exit_mmap-trace-point/20260116-023126
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20260115182720.1691130-9-Liam.Howlett%40oracle.com
patch subject: [PATCH v2 08/10] mm/vma: Use unmap_desc in exit_mmap() and vms_clear_ptes()
config: m68k-allnoconfig (https://download.01.org/0day-ci/archive/20260116/202601160925.VR8a2hUw-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260116/202601160925.VR8a2hUw-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/202601160925.VR8a2hUw-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from mm/internal.h:23,
                    from mm/filemap.c:54:
   mm/vma.h: In function 'unmap_all_init':
>> mm/vma.h:175:27: error: 'FIRST_USER_ADDRESS' undeclared (first use in this function)
     175 |         unmap->pg_start = FIRST_USER_ADDRESS;
         |                           ^~~~~~~~~~~~~~~~~~
   mm/vma.h:175:27: note: each undeclared identifier is reported only once for each function it appears in
>> mm/vma.h:176:25: error: 'USER_PGTABLES_CEILING' undeclared (first use in this function)
     176 |         unmap->pg_end = USER_PGTABLES_CEILING;
         |                         ^~~~~~~~~~~~~~~~~~~~~


vim +/FIRST_USER_ADDRESS +175 mm/vma.h

   169	
   170	static inline void unmap_all_init(struct unmap_desc *unmap,
   171			struct vma_iterator *vmi, struct vm_area_struct *vma)
   172	{
   173		unmap->mas = &vmi->mas;
   174		unmap->first = vma;
 > 175		unmap->pg_start = FIRST_USER_ADDRESS;
 > 176		unmap->pg_end = USER_PGTABLES_CEILING;
   177		unmap->vma_start = 0;
   178		unmap->vma_end = ULONG_MAX;
   179		unmap->tree_end = ULONG_MAX;
   180		unmap->tree_reset = vma->vm_end;
   181		unmap->mm_wr_locked = false;
   182	}
   183	

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