tree: git://people.freedesktop.org/~airlied/linux.git drm-syncobj
head: 58ec426a9ee099705987657cfad202b5bd96e363
commit: 58ec426a9ee099705987657cfad202b5bd96e363 [8/8] amdgpu: use sync file for shared semaphores (v3)
config: i386-randconfig-x075-201715 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
git checkout 58ec426a9ee099705987657cfad202b5bd96e363
# save the attached .config to linux build tree
make ARCH=i386
Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings
All warnings (new ones prefixed by >>):
In file included from include/drm/drmP.h:60:0,
from drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c:28:
drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c: In function 'amdgpu_cs_ioctl':
>> include/linux/dma-fence.h:194:5: warning: 'old_fence' may be used uninitialized in this function [-Wmaybe-uninitialized]
if (fence)
^
drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c:1033:20: note: 'old_fence' was declared here
struct dma_fence *old_fence;
^~~~~~~~~
--
In file included from include/drm/drmP.h:60:0,
from drivers/gpu//drm/amd/amdgpu/amdgpu_cs.c:28:
drivers/gpu//drm/amd/amdgpu/amdgpu_cs.c: In function 'amdgpu_cs_ioctl':
>> include/linux/dma-fence.h:194:5: warning: 'old_fence' may be used uninitialized in this function [-Wmaybe-uninitialized]
if (fence)
^
drivers/gpu//drm/amd/amdgpu/amdgpu_cs.c:1033:20: note: 'old_fence' was declared here
struct dma_fence *old_fence;
^~~~~~~~~
vim +/old_fence +194 include/linux/dma-fence.h
f54d1867 include/linux/dma-fence.h Chris Wilson 2016-10-25 178 void (*timeline_value_str)(struct dma_fence *fence,
f54d1867 include/linux/dma-fence.h Chris Wilson 2016-10-25 179 char *str, int size);
e941759c include/linux/fence.h Maarten Lankhorst 2014-07-01 180 };
e941759c include/linux/fence.h Maarten Lankhorst 2014-07-01 181
f54d1867 include/linux/dma-fence.h Chris Wilson 2016-10-25 182 void dma_fence_init(struct dma_fence *fence, const struct dma_fence_ops *ops,
76bf0db5 include/linux/fence.h Christian König 2016-06-01 183 spinlock_t *lock, u64 context, unsigned seqno);
e941759c include/linux/fence.h Maarten Lankhorst 2014-07-01 184
f54d1867 include/linux/dma-fence.h Chris Wilson 2016-10-25 185 void dma_fence_release(struct kref *kref);
f54d1867 include/linux/dma-fence.h Chris Wilson 2016-10-25 186 void dma_fence_free(struct dma_fence *fence);
e941759c include/linux/fence.h Maarten Lankhorst 2014-07-01 187
e941759c include/linux/fence.h Maarten Lankhorst 2014-07-01 188 /**
f54d1867 include/linux/dma-fence.h Chris Wilson 2016-10-25 189 * dma_fence_put - decreases refcount of the fence
4be05420 include/linux/fence.h Chris Wilson 2016-08-29 190 * @fence: [in] fence to reduce refcount of
4be05420 include/linux/fence.h Chris Wilson 2016-08-29 191 */
f54d1867 include/linux/dma-fence.h Chris Wilson 2016-10-25 192 static inline void dma_fence_put(struct dma_fence *fence)
4be05420 include/linux/fence.h Chris Wilson 2016-08-29 193 {
4be05420 include/linux/fence.h Chris Wilson 2016-08-29 @194 if (fence)
f54d1867 include/linux/dma-fence.h Chris Wilson 2016-10-25 195 kref_put(&fence->refcount, dma_fence_release);
4be05420 include/linux/fence.h Chris Wilson 2016-08-29 196 }
4be05420 include/linux/fence.h Chris Wilson 2016-08-29 197
4be05420 include/linux/fence.h Chris Wilson 2016-08-29 198 /**
f54d1867 include/linux/dma-fence.h Chris Wilson 2016-10-25 199 * dma_fence_get - increases refcount of the fence
e941759c include/linux/fence.h Maarten Lankhorst 2014-07-01 200 * @fence: [in] fence to increase refcount of
e941759c include/linux/fence.h Maarten Lankhorst 2014-07-01 201 *
e941759c include/linux/fence.h Maarten Lankhorst 2014-07-01 202 * Returns the same fence, with refcount increased by 1.
:::::: The code at line 194 was first introduced by commit
:::::: 4be0542073a33cc063b6a8f8fb367536e234e7aa dma-buf: Introduce fence_get_rcu_safe()
:::::: TO: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
:::::: CC: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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