[PATCH v2 2/3] drm/pagemap: Add a populate_mm op

[kernel test robot]

Hi Thomas,

kernel test robot noticed the following build errors:

[auto build test ERROR on drm-xe/drm-xe-next]
[also build test ERROR on next-20250604]
[cannot apply to linus/master v6.15]
[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/Thomas-Hellstr-m/drm-gpusvm-drm-pagemap-Move-migration-functionality-to-drm_pagemap/20250604-173757
base:   https://gitlab.freedesktop.org/drm/xe/kernel.git drm-xe-next
patch link:    https://lore.kernel.org/r/20250604093536.95982-3-thomas.hellstrom%40linux.intel.com
patch subject: [PATCH v2 2/3] drm/pagemap: Add a populate_mm op
config: loongarch-allyesconfig (https://download.01.org/0day-ci/archive/20250605/202506050405.9sHdzAlO-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250605/202506050405.9sHdzAlO-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202506050405.9sHdzAlO-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

   drivers/gpu/drm/drm_pagemap.c:315: warning: Function parameter or struct member 'timeslice_ms' not described in 'drm_pagemap_migrate_to_devmem'
>> drivers/gpu/drm/drm_pagemap.c:833: warning: Function parameter or struct member 'timeslice_ms' not described in 'drm_pagemap_populate_mm'
--
   loongarch64-linux-ld: arch/loongarch/kernel/head.o: relocation R_LARCH_B26 overflow 0xffffffffef55fa70
   arch/loongarch/kernel/head.o: in function `smpboot_entry':
>> (.ref.text+0x160): relocation truncated to fit: R_LARCH_B26 against symbol `start_secondary' defined in .text section in arch/loongarch/kernel/smp.o
   loongarch64-linux-ld: final link failed: bad value


vim +833 drivers/gpu/drm/drm_pagemap.c

   813	
   814	/**
   815	 * drm_pagemap_populate_mm() - Populate a virtual range with device memory pages
   816	 * @dpagemap: Pointer to the drm_pagemap managing the device memory
   817	 * @start: Start of the virtual range to populate.
   818	 * @end: End of the virtual range to populate.
   819	 * @mm: Pointer to the virtual address space.
   820	 *
   821	 * Attempt to populate a virtual range with device memory pages,
   822	 * clearing them or migrating data from the existing pages if necessary.
   823	 * The function is best effort only, and implementations may vary
   824	 * in how hard they try to satisfy the request.
   825	 *
   826	 * Return: 0 on success, negative error code on error. If the hardware
   827	 * device was removed / unbound the function will return -ENODEV;
   828	 */
   829	int drm_pagemap_populate_mm(struct drm_pagemap *dpagemap,
   830				    unsigned long start, unsigned long end,
   831				    struct mm_struct *mm,
   832				    unsigned long timeslice_ms)
 > 833	{

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