tree: git://anongit.freedesktop.org/drm/drm-tip drm-tip head: 6eff63a9b932a4aa1e1f6e521cd919aaf57c058f commit: 1d51775cd3f51899ce85afab686c7f641ff32d4e [1291/1307] dma-buf: add dma_resv selftest v4 config: arm-buildonly-randconfig-r006-20211025 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project a461fa64bb37cffd73f683c74f6b0780379fc2ca) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi git remote add drm-tip git://anongit.freedesktop.org/drm/drm-tip git fetch --no-tags drm-tip drm-tip git checkout 1d51775cd3f51899ce85afab686c7f641ff32d4e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm

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

All warnings (new ones prefixed by >>):

...

drivers/dma-buf/st-dma-resv.c:295:7: warning: variable 'i' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]

if (r) { ^ drivers/dma-buf/st-dma-resv.c:336:9: note: uninitialized use occurs here while (i--) ^ drivers/dma-buf/st-dma-resv.c:295:3: note: remove the 'if' if its condition is always false if (r) { ^~~~~~~~ drivers/dma-buf/st-dma-resv.c:288:6: warning: variable 'i' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] if (r) { ^ drivers/dma-buf/st-dma-resv.c:336:9: note: uninitialized use occurs here while (i--) ^ drivers/dma-buf/st-dma-resv.c:288:2: note: remove the 'if' if its condition is always false if (r) { ^~~~~~~~ drivers/dma-buf/st-dma-resv.c:280:10: note: initialize the variable 'i' to silence this warning int r, i; ^ = 0 2 warnings generated.

vim +295 drivers/dma-buf/st-dma-resv.c

275 276 static int test_get_fences(void *arg, bool shared) 277 { 278 struct dma_fence *f, *excl = NULL, **fences = NULL; 279 struct dma_resv resv; 280 int r, i; 281 282 f = alloc_fence(); 283 if (!f) 284 return -ENOMEM; 285 286 dma_resv_init(&resv); 287 r = dma_resv_lock(&resv, NULL); 288 if (r) { 289 pr_err("Resv locking failed\n"); 290 goto err_free; 291 } 292 293 if (shared) { 294 r = dma_resv_reserve_shared(&resv, 1);

295 if (r) {

296 pr_err("Resv shared slot allocation failed\n"); 297 dma_resv_unlock(&resv); 298 goto err_free; 299 } 300 301 dma_resv_add_shared_fence(&resv, f); 302 } else { 303 dma_resv_add_excl_fence(&resv, f); 304 } 305 dma_resv_unlock(&resv); 306 307 r = dma_resv_get_fences(&resv, &excl, &i, &fences); 308 if (r) { 309 pr_err("get_fences failed\n"); 310 goto err_free; 311 } 312 313 if (shared) { 314 if (excl != NULL) { 315 pr_err("get_fences returned unexpected excl fence\n"); 316 goto err_free; 317 } 318 if (i != 1 || fences[0] != f) { 319 pr_err("get_fences returned unexpected shared fence\n"); 320 goto err_free; 321 } 322 } else { 323 if (excl != f) { 324 pr_err("get_fences returned unexpected excl fence\n"); 325 goto err_free; 326 } 327 if (i != 0) { 328 pr_err("get_fences returned unexpected shared fence\n"); 329 goto err_free; 330 } 331 } 332 333 dma_fence_signal(f); 334 err_free: 335 dma_fence_put(excl); 336 while (i--) 337 dma_fence_put(fences[i]); 338 kfree(fences); 339 dma_resv_fini(&resv); 340 dma_fence_put(f); 341 return r; 342 } 343

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