Hi Felix, kernel test robot noticed the following build warnings:
[auto build test WARNING on drm-misc/drm-misc-next] [also build test WARNING on drm/drm-next drm-exynos/exynos-drm-next drm-intel/for-linux-next drm-intel/for-linux-next-fixes drm-tip/drm-tip linus/master v6.7-rc2 next-20231122] [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#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Felix-Kuehling/drm-prime-Helper-to-export-dmabuf-without-fd/20231122-071410 base: git://anongit.freedesktop.org/drm/drm-misc drm-misc-next patch link: https://lore.kernel.org/r/20231121231114.703478-2-Felix.Kuehling%40amd.com patch subject: [PATCH v2 2/4] drm/prime: Helper to export dmabuf without fd config: alpha-allyesconfig (https://download.01.org/0day-ci/archive/20231122/202311221810.ij6elh6c-...@intel.com/config) compiler: alpha-linux-gcc (GCC) 13.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231122/202311221810.ij6elh6c-...@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <l...@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202311221810.ij6elh6c-...@intel.com/ All warnings (new ones prefixed by >>): >> drivers/gpu/drm/drm_prime.c:428: warning: Excess function parameter >> 'dma_buf' description in 'drm_gem_prime_handle_to_dmabuf' vim +428 drivers/gpu/drm/drm_prime.c 319c933c71f3db Daniel Vetter 2013-08-15 411 d3977ac8e10a0b Felix Kuehling 2023-11-21 412 /** f3facd92ee25e0 Felix Kuehling 2023-11-21 413 * drm_gem_prime_handle_to_dmabuf - PRIME export function for GEM drivers 39cc344acd414e Daniel Vetter 2014-01-22 414 * @dev: dev to export the buffer from 39cc344acd414e Daniel Vetter 2014-01-22 415 * @file_priv: drm file-private structure 39cc344acd414e Daniel Vetter 2014-01-22 416 * @handle: buffer handle to export 39cc344acd414e Daniel Vetter 2014-01-22 417 * @flags: flags like DRM_CLOEXEC f3facd92ee25e0 Felix Kuehling 2023-11-21 418 * @dma_buf: pointer to storage for the dma-buf reference 39cc344acd414e Daniel Vetter 2014-01-22 419 * 39cc344acd414e Daniel Vetter 2014-01-22 420 * This is the PRIME export function which must be used mandatorily by GEM 39cc344acd414e Daniel Vetter 2014-01-22 421 * drivers to ensure correct lifetime management of the underlying GEM object. 39cc344acd414e Daniel Vetter 2014-01-22 422 * The actual exporting from GEM object to a dma-buf is done through the d693def4fd1c23 Thomas Zimmermann 2020-09-23 423 * &drm_gem_object_funcs.export callback. 39cc344acd414e Daniel Vetter 2014-01-22 424 */ f3facd92ee25e0 Felix Kuehling 2023-11-21 425 struct dma_buf *drm_gem_prime_handle_to_dmabuf(struct drm_device *dev, f3facd92ee25e0 Felix Kuehling 2023-11-21 426 struct drm_file *file_priv, f3facd92ee25e0 Felix Kuehling 2023-11-21 427 uint32_t handle, uint32_t flags) 3248877ea17969 Dave Airlie 2011-11-25 @428 { 3248877ea17969 Dave Airlie 2011-11-25 429 struct drm_gem_object *obj; 219b47339ced80 Dave Airlie 2013-04-22 430 int ret = 0; f3facd92ee25e0 Felix Kuehling 2023-11-21 431 struct dma_buf *dmabuf = NULL; 3248877ea17969 Dave Airlie 2011-11-25 432 d0b2c5334f41bd Daniel Vetter 2013-08-15 433 mutex_lock(&file_priv->prime.lock); a8ad0bd84f9860 Chris Wilson 2016-05-09 434 obj = drm_gem_object_lookup(file_priv, handle); d0b2c5334f41bd Daniel Vetter 2013-08-15 435 if (!obj) { d0b2c5334f41bd Daniel Vetter 2013-08-15 436 ret = -ENOENT; d0b2c5334f41bd Daniel Vetter 2013-08-15 437 goto out_unlock; d0b2c5334f41bd Daniel Vetter 2013-08-15 438 } d0b2c5334f41bd Daniel Vetter 2013-08-15 439 d0b2c5334f41bd Daniel Vetter 2013-08-15 440 dmabuf = drm_prime_lookup_buf_by_handle(&file_priv->prime, handle); d0b2c5334f41bd Daniel Vetter 2013-08-15 441 if (dmabuf) { d0b2c5334f41bd Daniel Vetter 2013-08-15 442 get_dma_buf(dmabuf); f3facd92ee25e0 Felix Kuehling 2023-11-21 443 goto out; d0b2c5334f41bd Daniel Vetter 2013-08-15 444 } 3248877ea17969 Dave Airlie 2011-11-25 445 d0b2c5334f41bd Daniel Vetter 2013-08-15 446 mutex_lock(&dev->object_name_lock); 3248877ea17969 Dave Airlie 2011-11-25 447 /* re-export the original imported object */ 3248877ea17969 Dave Airlie 2011-11-25 448 if (obj->import_attach) { 219b47339ced80 Dave Airlie 2013-04-22 449 dmabuf = obj->import_attach->dmabuf; 319c933c71f3db Daniel Vetter 2013-08-15 450 get_dma_buf(dmabuf); 219b47339ced80 Dave Airlie 2013-04-22 451 goto out_have_obj; 3248877ea17969 Dave Airlie 2011-11-25 452 } 3248877ea17969 Dave Airlie 2011-11-25 453 319c933c71f3db Daniel Vetter 2013-08-15 454 if (obj->dma_buf) { 319c933c71f3db Daniel Vetter 2013-08-15 455 get_dma_buf(obj->dma_buf); 319c933c71f3db Daniel Vetter 2013-08-15 456 dmabuf = obj->dma_buf; 219b47339ced80 Dave Airlie 2013-04-22 457 goto out_have_obj; 219b47339ced80 Dave Airlie 2013-04-22 458 } 219b47339ced80 Dave Airlie 2013-04-22 459 319c933c71f3db Daniel Vetter 2013-08-15 460 dmabuf = export_and_register_object(dev, obj, flags); 4332bf438bbbc3 Daniel Vetter 2013-08-15 461 if (IS_ERR(dmabuf)) { 3248877ea17969 Dave Airlie 2011-11-25 462 /* normally the created dma-buf takes ownership of the ref, 3248877ea17969 Dave Airlie 2011-11-25 463 * but if that fails then drop the ref 3248877ea17969 Dave Airlie 2011-11-25 464 */ 4332bf438bbbc3 Daniel Vetter 2013-08-15 465 ret = PTR_ERR(dmabuf); d0b2c5334f41bd Daniel Vetter 2013-08-15 466 mutex_unlock(&dev->object_name_lock); 219b47339ced80 Dave Airlie 2013-04-22 467 goto out; 3248877ea17969 Dave Airlie 2011-11-25 468 } 219b47339ced80 Dave Airlie 2013-04-22 469 d0b2c5334f41bd Daniel Vetter 2013-08-15 470 out_have_obj: d0b2c5334f41bd Daniel Vetter 2013-08-15 471 /* d0b2c5334f41bd Daniel Vetter 2013-08-15 472 * If we've exported this buffer then cheat and add it to the import list d0b2c5334f41bd Daniel Vetter 2013-08-15 473 * so we get the correct handle back. We must do this under the d0b2c5334f41bd Daniel Vetter 2013-08-15 474 * protection of dev->object_name_lock to ensure that a racing gem close d0b2c5334f41bd Daniel Vetter 2013-08-15 475 * ioctl doesn't miss to remove this buffer handle from the cache. 0ff926c7d4f06f Dave Airlie 2012-05-20 476 */ 219b47339ced80 Dave Airlie 2013-04-22 477 ret = drm_prime_add_buf_handle(&file_priv->prime, 319c933c71f3db Daniel Vetter 2013-08-15 478 dmabuf, handle); d0b2c5334f41bd Daniel Vetter 2013-08-15 479 mutex_unlock(&dev->object_name_lock); 219b47339ced80 Dave Airlie 2013-04-22 480 if (ret) 4332bf438bbbc3 Daniel Vetter 2013-08-15 481 dma_buf_put(dmabuf); 219b47339ced80 Dave Airlie 2013-04-22 482 out: be6ee102341bc4 Emil Velikov 2020-05-15 483 drm_gem_object_put(obj); d0b2c5334f41bd Daniel Vetter 2013-08-15 484 out_unlock: d0b2c5334f41bd Daniel Vetter 2013-08-15 485 mutex_unlock(&file_priv->prime.lock); d0b2c5334f41bd Daniel Vetter 2013-08-15 486 f3facd92ee25e0 Felix Kuehling 2023-11-21 487 return ret ? ERR_PTR(ret) : dmabuf; b283e92a2315f9 Daniel Vetter 2019-06-18 488 } f3facd92ee25e0 Felix Kuehling 2023-11-21 489 EXPORT_SYMBOL(drm_gem_prime_handle_to_dmabuf); b283e92a2315f9 Daniel Vetter 2019-06-18 490 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
