drivers/dma-buf/dma-fence.c:1000:38: sparse: sparse: incorrect type in initializer (different address spaces)

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   05f7e89ab9731565d8a62e3b5d1ec206485eeb0b
commit: ac364014fd812c8a2babe8f9dff8c909271a653e dma-buf: cleanup dma_fence_describe v3
date:   3 months ago
config: sparc64-randconfig-r113-20260209 (https://download.01.org/0day-ci/archive/20260210/202602100848.yaM8YnCT-lkp@xxxxxxxxx/config)
compiler: sparc64-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260210/202602100848.yaM8YnCT-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202602100848.yaM8YnCT-lkp@xxxxxxxxx/

sparse warnings: (new ones prefixed by >>)
>> drivers/dma-buf/dma-fence.c:1000:38: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected char const [noderef] __rcu *timeline @@     got char * @@
   drivers/dma-buf/dma-fence.c:1000:38: sparse:     expected char const [noderef] __rcu *timeline
   drivers/dma-buf/dma-fence.c:1000:38: sparse:     got char *
>> drivers/dma-buf/dma-fence.c:1001:36: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected char const [noderef] __rcu *driver @@     got char * @@
   drivers/dma-buf/dma-fence.c:1001:36: sparse:     expected char const [noderef] __rcu *driver
   drivers/dma-buf/dma-fence.c:1001:36: sparse:     got char *
   drivers/dma-buf/dma-fence.c:1112:51: sparse: sparse: incorrect type in return expression (different address spaces) @@     expected char const [noderef] __rcu * @@     got char const * @@
   drivers/dma-buf/dma-fence.c:1112:51: sparse:     expected char const [noderef] __rcu *
   drivers/dma-buf/dma-fence.c:1112:51: sparse:     got char const *
   drivers/dma-buf/dma-fence.c:1114:24: sparse: sparse: incorrect type in return expression (different address spaces) @@     expected char const [noderef] __rcu * @@     got char * @@
   drivers/dma-buf/dma-fence.c:1114:24: sparse:     expected char const [noderef] __rcu *
   drivers/dma-buf/dma-fence.c:1114:24: sparse:     got char *
   drivers/dma-buf/dma-fence.c:1144:51: sparse: sparse: incorrect type in return expression (different address spaces) @@     expected char const [noderef] __rcu * @@     got char const * @@
   drivers/dma-buf/dma-fence.c:1144:51: sparse:     expected char const [noderef] __rcu *
   drivers/dma-buf/dma-fence.c:1144:51: sparse:     got char const *
   drivers/dma-buf/dma-fence.c:1146:24: sparse: sparse: incorrect type in return expression (different address spaces) @@     expected char const [noderef] __rcu * @@     got char * @@
   drivers/dma-buf/dma-fence.c:1146:24: sparse:     expected char const [noderef] __rcu *
   drivers/dma-buf/dma-fence.c:1146:24: sparse:     got char *

vim +1000 drivers/dma-buf/dma-fence.c

   990	
   991	/**
   992	 * dma_fence_describe - Dump fence description into seq_file
   993	 * @fence: the fence to describe
   994	 * @seq: the seq_file to put the textual description into
   995	 *
   996	 * Dump a textual description of the fence and it's state into the seq_file.
   997	 */
   998	void dma_fence_describe(struct dma_fence *fence, struct seq_file *seq)
   999	{
> 1000		const char __rcu *timeline = "";
> 1001		const char __rcu *driver = "";
  1002		const char *signaled = "";
  1003	
  1004		rcu_read_lock();
  1005	
  1006		if (!dma_fence_is_signaled(fence)) {
  1007			timeline = dma_fence_timeline_name(fence);
  1008			driver = dma_fence_driver_name(fence);
  1009			signaled = "un";
  1010		}
  1011	
  1012		seq_printf(seq, "%llu:%llu %s %s %ssignalled\n",
  1013			   fence->context, fence->seqno, timeline, driver,
  1014			   signaled);
  1015	
  1016		rcu_read_unlock();
  1017	}
  1018	EXPORT_SYMBOL(dma_fence_describe);
  1019	

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