Hi Jason, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on tegra-drm/drm/tegra/for-next] [also build test WARNING on linus/master v5.13-rc2 next-20210521] [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-buf-Add-an-API-for-exporting-sync-files-v8/20210522-201251 base: git://anongit.freedesktop.org/tegra/linux.git drm/tegra/for-next config: x86_64-randconfig-s031-20210522 (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/925221f402201e7b1f665619dda2c5ee6d6324f1 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Jason-Ekstrand/dma-buf-Add-an-API-for-exporting-sync-files-v8/20210522-201251 git checkout 925221f402201e7b1f665619dda2c5ee6d6324f1 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=x86_64 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/dma-buf/dma-resv.c:550: warning: expecting prototype for dma_resv_get_singleton(). Prototype was for dma_resv_get_singleton_rcu() instead vim +550 drivers/dma-buf/dma-resv.c 534 535 /** 536 * dma_resv_get_singleton - get a single fence for the dma_resv object 537 * @obj: the reservation object 538 * @extra: extra fence to add to the resulting array 539 * @result: resulting dma_fence 540 * 541 * Get a single fence representing all unsignaled fences in the dma_resv object 542 * plus the given extra fence. If we got only one fence return a new 543 * reference to that, otherwise return a dma_fence_array object. 544 * 545 * RETURNS 546 * Returns -NOMEM if allocations fail, zero otherwise. 547 */ 548 int dma_resv_get_singleton_rcu(struct dma_resv *obj, struct dma_fence *extra, 549 struct dma_fence **result) > 550 { 551 struct dma_fence **resv_fences, *fence, *chain, **fences; 552 struct dma_fence_array *array; 553 unsigned int num_resv_fences, num_fences; 554 unsigned int ret, i, j; 555 556 ret = dma_resv_get_fences_rcu(obj, NULL, &num_resv_fences, &resv_fences); 557 if (ret) 558 return ret; 559 560 num_fences = 0; 561 *result = NULL; 562 563 if (num_resv_fences == 0 && !extra) 564 return 0; 565 566 for (i = 0; i < num_resv_fences; ++i) { 567 dma_fence_deep_dive_for_each(fence, chain, j, resv_fences[i]) { 568 if (dma_fence_is_signaled(fence)) 569 continue; 570 571 *result = fence; 572 ++num_fences; 573 } 574 } 575 576 if (extra) { 577 dma_fence_deep_dive_for_each(fence, chain, j, extra) { 578 if (dma_fence_is_signaled(fence)) 579 continue; 580 581 *result = fence; 582 ++num_fences; 583 } 584 } 585 586 if (num_fences <= 1) { 587 *result = dma_fence_get(*result); 588 goto put_resv_fences; 589 } 590 591 fences = kmalloc_array(num_fences, sizeof(struct dma_fence*), 592 GFP_KERNEL); 593 if (!fences) { 594 *result = NULL; 595 ret = -ENOMEM; 596 goto put_resv_fences; 597 } 598 599 num_fences = 0; 600 for (i = 0; i < num_resv_fences; ++i) { 601 dma_fence_deep_dive_for_each(fence, chain, j, resv_fences[i]) { 602 if (!dma_fence_is_signaled(fence)) 603 fences[num_fences++] = dma_fence_get(fence); 604 } 605 } 606 607 if (extra) { 608 dma_fence_deep_dive_for_each(fence, chain, j, extra) { 609 if (dma_fence_is_signaled(fence)) 610 fences[num_fences++] = dma_fence_get(fence); 611 } 612 } 613 614 if (num_fences <= 1) { 615 *result = num_fences ? fences[0] : NULL; 616 kfree(fences); 617 goto put_resv_fences; 618 } 619 620 array = dma_fence_array_create(num_fences, fences, 621 dma_fence_context_alloc(1), 622 1, false); 623 if (array) { 624 *result = &array->base; 625 } else { 626 *result = NULL; 627 while (num_fences--) 628 dma_fence_put(fences[num_fences]); 629 kfree(fences); 630 ret = -ENOMEM; 631 } 632 633 put_resv_fences: 634 while (num_resv_fences--) 635 dma_fence_put(resv_fences[num_resv_fences]); 636 kfree(resv_fences); 637 638 return ret; 639 } 640 EXPORT_SYMBOL_GPL(dma_resv_get_singleton_rcu); 641 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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