Re: [Intel-gfx] [PATCH 5/5] DONOTMERGE: dma-buf: Get rid of dma_fence_get_rcu_safe

From: kernel test robot <lkp@intel.com>
To: Jason Ekstrand <jason@jlekstrand.net>,
	dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org
Cc: "Daniel Vetter" <daniel.vetter@ffwll.ch>,
	kbuild-all@lists.01.org,
	"Christian König" <christian.koenig@amd.com>,
	"Matthew Auld" <matthew.auld@intel.com>
Subject: Re: [Intel-gfx] [PATCH 5/5] DONOTMERGE: dma-buf: Get rid of dma_fence_get_rcu_safe
Date: Thu, 17 Jun 2021 00:38:13 +0800	[thread overview]
Message-ID: <202106170032.TXlM6R6N-lkp@intel.com> (raw)
In-Reply-To: <20210609212959.471209-6-jason@jlekstrand.net>

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Hi Jason,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on drm-intel/for-linux-next]
[also build test WARNING on drm-tip/drm-tip drm-exynos/exynos-drm-next tegra-drm/drm/tegra/for-next linus/master v5.13-rc6 next-20210616]
[cannot apply to drm/drm-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Jason-Ekstrand/dma-fence-i915-Stop-allowing-SLAB_TYPESAFE_BY_RCU-for-dma_fence/20210616-154432
base:   git://anongit.freedesktop.org/drm-intel for-linux-next
config: i386-randconfig-s001-20210615 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-341-g8af24329-dirty
        # https://github.com/0day-ci/linux/commit/d718e3dba487fc068d793f6220ac2508c98d0eef
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Jason-Ekstrand/dma-fence-i915-Stop-allowing-SLAB_TYPESAFE_BY_RCU-for-dma_fence/20210616-154432
        git checkout d718e3dba487fc068d793f6220ac2508c98d0eef
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=i386 

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

sparse warnings: (new ones prefixed by >>)
   drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c: note: in included file:
>> include/drm/drm_syncobj.h:110:50: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected struct dma_fence *fence @@     got struct dma_fence [noderef] __rcu *fence @@
   include/drm/drm_syncobj.h:110:50: sparse:     expected struct dma_fence *fence
   include/drm/drm_syncobj.h:110:50: sparse:     got struct dma_fence [noderef] __rcu *fence
>> include/drm/drm_syncobj.h:110:50: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected struct dma_fence *fence @@     got struct dma_fence [noderef] __rcu *fence @@
   include/drm/drm_syncobj.h:110:50: sparse:     expected struct dma_fence *fence
   include/drm/drm_syncobj.h:110:50: sparse:     got struct dma_fence [noderef] __rcu *fence

vim +110 include/drm/drm_syncobj.h

    90	
    91	/**
    92	 * drm_syncobj_fence_get - get a reference to a fence in a sync object
    93	 * @syncobj: sync object.
    94	 *
    95	 * This acquires additional reference to &drm_syncobj.fence contained in @obj,
    96	 * if not NULL. It is illegal to call this without already holding a reference.
    97	 * No locks required.
    98	 *
    99	 * Returns:
   100	 * Either the fence of @obj or NULL if there's none.
   101	 */
   102	static inline struct dma_fence *
   103	drm_syncobj_fence_get(struct drm_syncobj *syncobj)
   104	{
   105		struct dma_fence *fence;
   106	
   107		rcu_read_lock();
   108		fence = rcu_dereference(syncobj->fence);
   109		if (fence)
 > 110			fence = dma_fence_get_rcu(syncobj->fence);
   111		rcu_read_unlock();
   112	
   113		return fence;
   114	}
   115	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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