[linux-next:master 1074/9662] drivers/dma-buf/dma-fence-chain.c:65:23: sparse: sparse: non size-preserving integer to pointer cast

[linux-next:master 1074/9662] drivers/dma-buf/dma-fence-chain.c:65:23: sparse: sparse: non size-preserving integer to pointer cast

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 4937 bytes --]

CC: kbuild-all(a)lists.01.org
TO: Chris Wilson <chris@chris-wilson.co.uk>
CC: Mika Kuoppala <mika.kuoppala@linux.intel.com>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   bdecf38f228bcca73b31ada98b5b7ba1215eb9c9
commit: 29da47cfc1f0c3aad0daa89ccf284c3465971482 [1074/9662] dma-buf: Prettify typecasts for dma-fence-chain
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.1-193-gb8fad4bc-dirty
        git checkout 29da47cfc1f0c3aad0daa89ccf284c3465971482
        make ARCH=x86_64 allmodconfig
        make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'
:::::: branch date: 13 hours ago
:::::: commit date: 5 weeks ago

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@intel.com>


sparse warnings: (new ones prefixed by >>)

>> drivers/dma-buf/dma-fence-chain.c:65:23: sparse: sparse: non size-preserving integer to pointer cast

# https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=29da47cfc1f0c3aad0daa89ccf284c3465971482
git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
git remote update linux-next
git checkout 29da47cfc1f0c3aad0daa89ccf284c3465971482
vim +65 drivers/dma-buf/dma-fence-chain.c

7bf60c52e093d9 Christian König 2019-04-01  30  
7bf60c52e093d9 Christian König 2019-04-01  31  /**
7bf60c52e093d9 Christian König 2019-04-01  32   * dma_fence_chain_walk - chain walking function
7bf60c52e093d9 Christian König 2019-04-01  33   * @fence: current chain node
7bf60c52e093d9 Christian König 2019-04-01  34   *
7bf60c52e093d9 Christian König 2019-04-01  35   * Walk the chain to the next node. Returns the next fence or NULL if we are at
7bf60c52e093d9 Christian König 2019-04-01  36   * the end of the chain. Garbage collects chain nodes which are already
7bf60c52e093d9 Christian König 2019-04-01  37   * signaled.
7bf60c52e093d9 Christian König 2019-04-01  38   */
7bf60c52e093d9 Christian König 2019-04-01  39  struct dma_fence *dma_fence_chain_walk(struct dma_fence *fence)
7bf60c52e093d9 Christian König 2019-04-01  40  {
7bf60c52e093d9 Christian König 2019-04-01  41  	struct dma_fence_chain *chain, *prev_chain;
7bf60c52e093d9 Christian König 2019-04-01  42  	struct dma_fence *prev, *replacement, *tmp;
7bf60c52e093d9 Christian König 2019-04-01  43  
7bf60c52e093d9 Christian König 2019-04-01  44  	chain = to_dma_fence_chain(fence);
7bf60c52e093d9 Christian König 2019-04-01  45  	if (!chain) {
7bf60c52e093d9 Christian König 2019-04-01  46  		dma_fence_put(fence);
7bf60c52e093d9 Christian König 2019-04-01  47  		return NULL;
7bf60c52e093d9 Christian König 2019-04-01  48  	}
7bf60c52e093d9 Christian König 2019-04-01  49  
7bf60c52e093d9 Christian König 2019-04-01  50  	while ((prev = dma_fence_chain_get_prev(chain))) {
7bf60c52e093d9 Christian König 2019-04-01  51  
7bf60c52e093d9 Christian König 2019-04-01  52  		prev_chain = to_dma_fence_chain(prev);
7bf60c52e093d9 Christian König 2019-04-01  53  		if (prev_chain) {
7bf60c52e093d9 Christian König 2019-04-01  54  			if (!dma_fence_is_signaled(prev_chain->fence))
7bf60c52e093d9 Christian König 2019-04-01  55  				break;
7bf60c52e093d9 Christian König 2019-04-01  56  
7bf60c52e093d9 Christian König 2019-04-01  57  			replacement = dma_fence_chain_get_prev(prev_chain);
7bf60c52e093d9 Christian König 2019-04-01  58  		} else {
7bf60c52e093d9 Christian König 2019-04-01  59  			if (!dma_fence_is_signaled(prev))
7bf60c52e093d9 Christian König 2019-04-01  60  				break;
7bf60c52e093d9 Christian König 2019-04-01  61  
7bf60c52e093d9 Christian König 2019-04-01  62  			replacement = NULL;
7bf60c52e093d9 Christian König 2019-04-01  63  		}
7bf60c52e093d9 Christian König 2019-04-01  64  
29da47cfc1f0c3 Chris Wilson    2020-04-09 @65  		tmp = cmpxchg((struct dma_fence __force **)&chain->prev,
29da47cfc1f0c3 Chris Wilson    2020-04-09  66  			      prev, replacement);
7bf60c52e093d9 Christian König 2019-04-01  67  		if (tmp == prev)
7bf60c52e093d9 Christian König 2019-04-01  68  			dma_fence_put(tmp);
7bf60c52e093d9 Christian König 2019-04-01  69  		else
7bf60c52e093d9 Christian König 2019-04-01  70  			dma_fence_put(replacement);
7bf60c52e093d9 Christian König 2019-04-01  71  		dma_fence_put(prev);
7bf60c52e093d9 Christian König 2019-04-01  72  	}
7bf60c52e093d9 Christian König 2019-04-01  73  
7bf60c52e093d9 Christian König 2019-04-01  74  	dma_fence_put(fence);
7bf60c52e093d9 Christian König 2019-04-01  75  	return prev;
7bf60c52e093d9 Christian König 2019-04-01  76  }
7bf60c52e093d9 Christian König 2019-04-01  77  EXPORT_SYMBOL(dma_fence_chain_walk);
7bf60c52e093d9 Christian König 2019-04-01  78  

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