linux-kernel - drivers/gpu/drm/nouveau/nouveau_fence.c:210:45: sparse: sparse: incorrect type in initializer (different address spaces)

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Date:   Thu, 14 Sep 2023 03:23:56 +0800
From:   kernel test robot <lkp@...el.com>
To:     Danilo Krummrich <dakr@...hat.com>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Dave Airlie <airlied@...hat.com>
Subject: drivers/gpu/drm/nouveau/nouveau_fence.c:210:45: sparse: sparse:
 incorrect type in initializer (different address spaces)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   3669558bdf354cd352be955ef2764cde6a9bf5ec
commit: 978474dc8278f661930e02e08d292a45a45fa01a drm/nouveau: fence: fix undefined fence state after emit
date:   2 weeks ago
config: i386-randconfig-062-20230913 (https://download.01.org/0day-ci/archive/20230914/202309140340.BwKXzaDx-lkp@intel.com/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230914/202309140340.BwKXzaDx-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202309140340.BwKXzaDx-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/gpu/drm/nouveau/nouveau_fence.c:210:45: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct nouveau_channel *chan @@     got struct nouveau_channel [noderef] __rcu *channel @@
   drivers/gpu/drm/nouveau/nouveau_fence.c:210:45: sparse:     expected struct nouveau_channel *chan
   drivers/gpu/drm/nouveau/nouveau_fence.c:210:45: sparse:     got struct nouveau_channel [noderef] __rcu *channel
   drivers/gpu/drm/nouveau/nouveau_fence.c:418:24: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct nouveau_channel [noderef] __rcu *channel @@     got struct nouveau_channel *chan @@
   drivers/gpu/drm/nouveau/nouveau_fence.c:418:24: sparse:     expected struct nouveau_channel [noderef] __rcu *channel
   drivers/gpu/drm/nouveau/nouveau_fence.c:418:24: sparse:     got struct nouveau_channel *chan

vim +210 drivers/gpu/drm/nouveau/nouveau_fence.c

   206	
   207	int
   208	nouveau_fence_emit(struct nouveau_fence *fence)
   209	{
 > 210		struct nouveau_channel *chan = fence->channel;
   211		struct nouveau_fence_chan *fctx = chan->fence;
   212		struct nouveau_fence_priv *priv = (void*)chan->drm->fence;
   213		int ret;
   214	
   215		fence->timeout  = jiffies + (15 * HZ);
   216	
   217		if (priv->uevent)
   218			dma_fence_init(&fence->base, &nouveau_fence_ops_uevent,
   219				       &fctx->lock, fctx->context, ++fctx->sequence);
   220		else
   221			dma_fence_init(&fence->base, &nouveau_fence_ops_legacy,
   222				       &fctx->lock, fctx->context, ++fctx->sequence);
   223		kref_get(&fctx->fence_ref);
   224	
   225		ret = fctx->emit(fence);
   226		if (!ret) {
   227			dma_fence_get(&fence->base);
   228			spin_lock_irq(&fctx->lock);
   229	
   230			if (unlikely(fctx->killed)) {
   231				spin_unlock_irq(&fctx->lock);
   232				dma_fence_put(&fence->base);
   233				return -ENODEV;
   234			}
   235	
   236			if (nouveau_fence_update(chan, fctx))
   237				nvif_event_block(&fctx->event);
   238	
   239			list_add_tail(&fence->head, &fctx->pending);
   240			spin_unlock_irq(&fctx->lock);
   241		}
   242	
   243		return ret;
   244	}
   245	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki