[PATCH v13 2/8] drm/ttm: Provide a shmem backup implementation

[kernel test robot]

Hi Thomas,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm-xe/drm-xe-next]
[also build test WARNING on linus/master v6.12-rc7 next-20241113]
[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-ttm-Balance-ttm_resource_cursor_init-and-ttm_resource_cursor_fini/20241114-023727
base:   https://gitlab.freedesktop.org/drm/xe/kernel.git drm-xe-next
patch link:    https://lore.kernel.org/r/20241113183550.6228-3-thomas.hellstrom%40linux.intel.com
patch subject: [PATCH v13 2/8] drm/ttm: Provide a shmem backup implementation
config: s390-allyesconfig (https://download.01.org/0day-ci/archive/20241114/202411140637.T225Mshs-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241114/202411140637.T225Mshs-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/202411140637.T225Mshs-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/ttm/ttm_backup.c:172: warning: expecting prototype for ttm_backup_shmem_bytes_avail(). Prototype was for ttm_backup_bytes_avail() instead


vim +172 drivers/gpu/drm/ttm/ttm_backup.c

   161	
   162	/**
   163	 * ttm_backup_shmem_bytes_avail() - Report the approximate number of bytes of backup space
   164	 * left for backup.
   165	 *
   166	 * This function is intended also for driver use to indicate whether a
   167	 * backup attempt is meaningful.
   168	 *
   169	 * Return: An approximate size of backup space available.
   170	 */
   171	u64 ttm_backup_bytes_avail(void)
 > 172	{
   173		/*
   174		 * The idea behind backing up to shmem is that shmem objects may
   175		 * eventually be swapped out. So no point swapping out if there
   176		 * is no or low swap-space available. But the accuracy of this
   177		 * number also depends on shmem actually swapping out backed-up
   178		 * shmem objects without too much buffering.
   179		 */
   180		return (u64)get_nr_swap_pages() << PAGE_SHIFT;
   181	}
   182	EXPORT_SYMBOL_GPL(ttm_backup_bytes_avail);
   183	

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