[drm-xe:drm-xe-next 1/3] drivers/gpu/drm/xe/xe_pt.c:1418:13: warning: 'xe_pt_svm_userptr_notifier_lock' defined but not used

[kernel test robot <lkp@intel.com>]

tree:   https://gitlab.freedesktop.org/drm/xe/kernel.git drm-xe-next
head:   e459a3bdeb117be496d7f229e2ea1f6c9fe4080b
commit: 80ccbd97ffee8ad2e73167d826fe7be548364365 [1/3] drm/xe/userptr: Hold notifier_lock for write on inject test path
config: um-allyesconfig (https://download.01.org/0day-ci/archive/20260630/202606302210.QqcLbOEN-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260630/202606302210.QqcLbOEN-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202606302210.QqcLbOEN-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/xe/xe_pt.c:1418:13: warning: 'xe_pt_svm_userptr_notifier_lock' defined but not used [-Wunused-function]
    1418 | static void xe_pt_svm_userptr_notifier_lock(struct xe_vm *vm)
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/xe_pt_svm_userptr_notifier_lock +1418 drivers/gpu/drm/xe/xe_pt.c

  1408	
  1409	/*
  1410	 * Acquire/release the svm notifier_lock around xe_pt_svm_userptr_pre_commit()
  1411	 * and the matching late release in xe_pt_update_ops_run(). Read mode by
  1412	 * default; write mode when CONFIG_DRM_XE_USERPTR_INVAL_INJECT is on,
  1413	 * because a userptr op in this critical section may invoke the injected
  1414	 * xe_vma_userptr_force_invalidate() path that calls
  1415	 * drm_gpusvm_unmap_pages() with ctx->in_notifier=true, which requires the
  1416	 * lock held for write.
  1417	 */
> 1418	static void xe_pt_svm_userptr_notifier_lock(struct xe_vm *vm)
  1419	{
  1420	#if IS_ENABLED(CONFIG_DRM_XE_USERPTR_INVAL_INJECT)
  1421		down_write(&vm->svm.gpusvm.notifier_lock);
  1422	#else
  1423		xe_svm_notifier_lock(vm);
  1424	#endif
  1425	}
  1426	

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