Hi "Thomas, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on drm-tip/drm-tip] [cannot apply to drm-intel/for-linux-next drm-exynos/exynos-drm-next tegra-drm/drm/tegra/for-next drm/drm-next v5.13 next-20210628] [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/Thomas-Hellstr-m/drm-i915-gem-Introduce-a-migrate-interface/20210628-171204 base: git://anongit.freedesktop.org/drm/drm-tip drm-tip config: x86_64-randconfig-a003-20210628 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 4c92e31dd0f1bd152eda883af20ff7fbcaa14945) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://github.com/0day-ci/linux/commit/e4e5a7f5c031252f26c868a2aa17a031a1558336 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Thomas-Hellstr-m/drm-i915-gem-Introduce-a-migrate-interface/20210628-171204 git checkout e4e5a7f5c031252f26c868a2aa17a031a1558336 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/gpu/drm/i915/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): drivers/gpu/drm/i915/gem/i915_gem_wait.c:184: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst * Waits for rendering to the object to be completed >> drivers/gpu/drm/i915/gem/i915_gem_wait.c:307: warning: expecting prototype for i915_gem_object_wait_migrate(). Prototype was for i915_gem_object_wait_migration() instead vim +307 drivers/gpu/drm/i915/gem/i915_gem_wait.c 182 183 /** > 184 * Waits for rendering to the object to be completed 185 * @obj: i915 gem object 186 * @flags: how to wait (under a lock, for all rendering or just for writes etc) 187 * @timeout: how long to wait 188 */ 189 int 190 i915_gem_object_wait(struct drm_i915_gem_object *obj, 191 unsigned int flags, 192 long timeout) 193 { 194 might_sleep(); 195 GEM_BUG_ON(timeout < 0); 196 197 timeout = i915_gem_object_wait_reservation(obj->base.resv, 198 flags, timeout); 199 return timeout < 0 ? timeout : 0; 200 } 201 202 static inline unsigned long nsecs_to_jiffies_timeout(const u64 n) 203 { 204 /* nsecs_to_jiffies64() does not guard against overflow */ 205 if (NSEC_PER_SEC % HZ && 206 div_u64(n, NSEC_PER_SEC) >= MAX_JIFFY_OFFSET / HZ) 207 return MAX_JIFFY_OFFSET; 208 209 return min_t(u64, MAX_JIFFY_OFFSET, nsecs_to_jiffies64(n) + 1); 210 } 211 212 static unsigned long to_wait_timeout(s64 timeout_ns) 213 { 214 if (timeout_ns < 0) 215 return MAX_SCHEDULE_TIMEOUT; 216 217 if (timeout_ns == 0) 218 return 0; 219 220 return nsecs_to_jiffies_timeout(timeout_ns); 221 } 222 223 /** 224 * i915_gem_wait_ioctl - implements DRM_IOCTL_I915_GEM_WAIT 225 * @dev: drm device pointer 226 * @data: ioctl data blob 227 * @file: drm file pointer 228 * 229 * Returns 0 if successful, else an error is returned with the remaining time in 230 * the timeout parameter. 231 * -ETIME: object is still busy after timeout 232 * -ERESTARTSYS: signal interrupted the wait 233 * -ENONENT: object doesn't exist 234 * Also possible, but rare: 235 * -EAGAIN: incomplete, restart syscall 236 * -ENOMEM: damn 237 * -ENODEV: Internal IRQ fail 238 * -E?: The add request failed 239 * 240 * The wait ioctl with a timeout of 0 reimplements the busy ioctl. With any 241 * non-zero timeout parameter the wait ioctl will wait for the given number of 242 * nanoseconds on an object becoming unbusy. Since the wait itself does so 243 * without holding struct_mutex the object may become re-busied before this 244 * function completes. A similar but shorter * race condition exists in the busy 245 * ioctl 246 */ 247 int 248 i915_gem_wait_ioctl(struct drm_device *dev, void *data, struct drm_file *file) 249 { 250 struct drm_i915_gem_wait *args = data; 251 struct drm_i915_gem_object *obj; 252 ktime_t start; 253 long ret; 254 255 if (args->flags != 0) 256 return -EINVAL; 257 258 obj = i915_gem_object_lookup(file, args->bo_handle); 259 if (!obj) 260 return -ENOENT; 261 262 start = ktime_get(); 263 264 ret = i915_gem_object_wait(obj, 265 I915_WAIT_INTERRUPTIBLE | 266 I915_WAIT_PRIORITY | 267 I915_WAIT_ALL, 268 to_wait_timeout(args->timeout_ns)); 269 270 if (args->timeout_ns > 0) { 271 args->timeout_ns -= ktime_to_ns(ktime_sub(ktime_get(), start)); 272 if (args->timeout_ns < 0) 273 args->timeout_ns = 0; 274 275 /* 276 * Apparently ktime isn't accurate enough and occasionally has a 277 * bit of mismatch in the jiffies<->nsecs<->ktime loop. So patch 278 * things up to make the test happy. We allow up to 1 jiffy. 279 * 280 * This is a regression from the timespec->ktime conversion. 281 */ 282 if (ret == -ETIME && !nsecs_to_jiffies(args->timeout_ns)) 283 args->timeout_ns = 0; 284 285 /* Asked to wait beyond the jiffie/scheduler precision? */ 286 if (ret == -ETIME && args->timeout_ns) 287 ret = -EAGAIN; 288 } 289 290 i915_gem_object_put(obj); 291 return ret; 292 } 293 294 /** 295 * i915_gem_object_wait_migrate - Sync an accelerated migration operation 296 * @obj: The migrating object. 297 * @flags: waiting flags. Currently supports only I915_WAIT_INTERRUPTIBLE. 298 * 299 * Wait for any pending async migration operation on the object, 300 * whether it's explicitly (i915_gem_object_migrate()) or implicitly 301 * (swapin, initial clearing) initiated. 302 * 303 * Return: 0 if successful, -ERESTARTSYS if a signal was hit during waiting. 304 */ 305 int i915_gem_object_wait_migration(struct drm_i915_gem_object *obj, 306 unsigned int flags) > 307 { --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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