[linux-nvme:nvme-6.15 3/4] drivers/nvme/host/core.c:4302:5: warning: 'CONFIG_NVME_MULTIPATH' is not defined, evaluates to 0

[kernel test robot]

tree:   git://git.infradead.org/nvme.git nvme-6.15
head:   9e270930d683ff0207fed7f303988a7ad63ddfcb
commit: a98aa32696a1a19814a2f97853400b28622c6a8f [3/4] nvme: re-read ANA log page after ns scan completes
config: riscv-randconfig-002-20250408 (https://download.01.org/0day-ci/archive/20250408/202504080139.KuphZ8ZZ-lkp@intel.com/config)
compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project 92c93f5286b9ff33f27ff694d2dc33da1c07afdd)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250408/202504080139.KuphZ8ZZ-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/202504080139.KuphZ8ZZ-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/nvme/host/core.c:4302:5: warning: 'CONFIG_NVME_MULTIPATH' is not defined, evaluates to 0 [-Wundef]
    4302 | #if CONFIG_NVME_MULTIPATH
         |     ^
   1 warning generated.


vim +/CONFIG_NVME_MULTIPATH +4302 drivers/nvme/host/core.c

  4254	
  4255	static void nvme_scan_work(struct work_struct *work)
  4256	{
  4257		struct nvme_ctrl *ctrl =
  4258			container_of(work, struct nvme_ctrl, scan_work);
  4259		int ret;
  4260	
  4261		/* No tagset on a live ctrl means IO queues could not created */
  4262		if (nvme_ctrl_state(ctrl) != NVME_CTRL_LIVE || !ctrl->tagset)
  4263			return;
  4264	
  4265		/*
  4266		 * Identify controller limits can change at controller reset due to
  4267		 * new firmware download, even though it is not common we cannot ignore
  4268		 * such scenario. Controller's non-mdts limits are reported in the unit
  4269		 * of logical blocks that is dependent on the format of attached
  4270		 * namespace. Hence re-read the limits at the time of ns allocation.
  4271		 */
  4272		ret = nvme_init_non_mdts_limits(ctrl);
  4273		if (ret < 0) {
  4274			dev_warn(ctrl->device,
  4275				"reading non-mdts-limits failed: %d\n", ret);
  4276			return;
  4277		}
  4278	
  4279		if (test_and_clear_bit(NVME_AER_NOTICE_NS_CHANGED, &ctrl->events)) {
  4280			dev_info(ctrl->device, "rescanning namespaces.\n");
  4281			nvme_clear_changed_ns_log(ctrl);
  4282		}
  4283	
  4284		mutex_lock(&ctrl->scan_lock);
  4285		if (!nvme_id_cns_ok(ctrl, NVME_ID_CNS_NS_ACTIVE_LIST)) {
  4286			nvme_scan_ns_sequential(ctrl);
  4287		} else {
  4288			/*
  4289			 * Fall back to sequential scan if DNR is set to handle broken
  4290			 * devices which should support Identify NS List (as per the VS
  4291			 * they report) but don't actually support it.
  4292			 */
  4293			ret = nvme_scan_ns_list(ctrl);
  4294			if (ret > 0 && ret & NVME_STATUS_DNR)
  4295				nvme_scan_ns_sequential(ctrl);
  4296		}
  4297		mutex_unlock(&ctrl->scan_lock);
  4298	
  4299		/* Requeue if we have missed AENs */
  4300		if (test_bit(NVME_AER_NOTICE_NS_CHANGED, &ctrl->events))
  4301			nvme_queue_scan(ctrl);
> 4302	#if CONFIG_NVME_MULTIPATH
  4303		else
  4304			/* Re-read the ANA log page to not miss updates */
  4305			queue_work(nvme_wq, &ctrl->ana_work);
  4306	#endif
  4307	}
  4308	

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