Hi Xidong, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on drm-intel/for-linux-next] [also build test WARNING on v4.16 next-20180403] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Xidong-Wang/drm-i915-Do-not-use-kfree-to-free-kmem_cache_alloc-return-value/20180404-193341 base: git://anongit.freedesktop.org/drm-intel for-linux-next config: i386-randconfig-a1-201813 (attached as .config) compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4 reproduce: # save the attached .config to linux build tree make ARCH=i386 All warnings (new ones prefixed by >>): drivers/gpu//drm/i915/i915_gem_execbuffer.c: In function 'eb_lookup_vmas': >> drivers/gpu//drm/i915/i915_gem_execbuffer.c:731:20: warning: passing argument 1 of 'kmem_cache_free' from incompatible pointer type kmem_cache_free(lut); ^ In file included from include/linux/reservation.h:44:0, from drivers/gpu//drm/i915/i915_gem_execbuffer.c:30: include/linux/slab.h:356:6: note: expected 'struct kmem_cache *' but argument is of type 'struct i915_lut_handle *' void kmem_cache_free(struct kmem_cache *, void *); ^ drivers/gpu//drm/i915/i915_gem_execbuffer.c:731:4: error: too few arguments to function 'kmem_cache_free' kmem_cache_free(lut); ^ In file included from include/linux/reservation.h:44:0, from drivers/gpu//drm/i915/i915_gem_execbuffer.c:30: include/linux/slab.h:356:6: note: declared here void kmem_cache_free(struct kmem_cache *, void *); ^ vim +/kmem_cache_free +731 drivers/gpu//drm/i915/i915_gem_execbuffer.c 685 686 static int eb_lookup_vmas(struct i915_execbuffer *eb) 687 { 688 struct radix_tree_root *handles_vma = &eb->ctx->handles_vma; 689 struct drm_i915_gem_object *obj; 690 unsigned int i; 691 int err; 692 693 if (unlikely(i915_gem_context_is_closed(eb->ctx))) 694 return -ENOENT; 695 696 if (unlikely(i915_gem_context_is_banned(eb->ctx))) 697 return -EIO; 698 699 INIT_LIST_HEAD(&eb->relocs); 700 INIT_LIST_HEAD(&eb->unbound); 701 702 for (i = 0; i < eb->buffer_count; i++) { 703 u32 handle = eb->exec[i].handle; 704 struct i915_lut_handle *lut; 705 struct i915_vma *vma; 706 707 vma = radix_tree_lookup(handles_vma, handle); 708 if (likely(vma)) 709 goto add_vma; 710 711 obj = i915_gem_object_lookup(eb->file, handle); 712 if (unlikely(!obj)) { 713 err = -ENOENT; 714 goto err_vma; 715 } 716 717 vma = i915_vma_instance(obj, eb->vm, NULL); 718 if (unlikely(IS_ERR(vma))) { 719 err = PTR_ERR(vma); 720 goto err_obj; 721 } 722 723 lut = kmem_cache_alloc(eb->i915->luts, GFP_KERNEL); 724 if (unlikely(!lut)) { 725 err = -ENOMEM; 726 goto err_obj; 727 } 728 729 err = radix_tree_insert(handles_vma, handle, vma); 730 if (unlikely(err)) { > 731 kmem_cache_free(lut); 732 goto err_obj; 733 } 734 735 /* transfer ref to ctx */ 736 vma->open_count++; 737 list_add(&lut->obj_link, &obj->lut_list); 738 list_add(&lut->ctx_link, &eb->ctx->handles_list); 739 lut->ctx = eb->ctx; 740 lut->handle = handle; 741 742 add_vma: 743 err = eb_add_vma(eb, i, vma); 744 if (unlikely(err)) 745 goto err_vma; 746 747 GEM_BUG_ON(vma != eb->vma[i]); 748 GEM_BUG_ON(vma->exec_flags != &eb->flags[i]); 749 } 750 751 /* take note of the batch buffer before we might reorder the lists */ 752 i = eb_batch_index(eb); 753 eb->batch = eb->vma[i]; 754 GEM_BUG_ON(eb->batch->exec_flags != &eb->flags[i]); 755 756 /* 757 * SNA is doing fancy tricks with compressing batch buffers, which leads 758 * to negative relocation deltas. Usually that works out ok since the 759 * relocate address is still positive, except when the batch is placed 760 * very low in the GTT. Ensure this doesn't happen. 761 * 762 * Note that actual hangs have only been observed on gen7, but for 763 * paranoia do it everywhere. 764 */ 765 if (!(eb->flags[i] & EXEC_OBJECT_PINNED)) 766 eb->flags[i] |= __EXEC_OBJECT_NEEDS_BIAS; 767 if (eb->reloc_cache.has_fence) 768 eb->flags[i] |= EXEC_OBJECT_NEEDS_FENCE; 769 770 eb->args->flags |= __EXEC_VALIDATED; 771 return eb_reserve(eb); 772 773 err_obj: 774 i915_gem_object_put(obj); 775 err_vma: 776 eb->vma[i] = NULL; 777 return err; 778 } 779 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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