[kbuild-all] [mlankhorst:locking-rework 12/36] drivers/gpu/drm/i915/gem/i915_gem_userptr.c:746:6: error: unused variable 'handle'

tree: git://people.freedesktop.org/~mlankhorst/linux locking-rework head: c19d2554f1d542e2aac63116de7321ef2bb09672 commit: 97ef20a5c69f47783e9b5a015348e0bfdc5863bf [12/36] drm/i915: Reject UNSYNCHRONIZED for userptr config: i386-randconfig-a012-20200918 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): git checkout 97ef20a5c69f47783e9b5a015348e0bfdc5863bf # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): drivers/gpu/drm/i915/gem/i915_gem_userptr.c: In function 'i915_gem_userptr_ioctl': 746 | u32 handle; | ^~~~~~ 745 | int ret; | ^~~ 741 | static struct lock_class_key lock_class; | ^~~~~~~~~~ At top level: cc1: all warnings being treated as errors git remote add mlankhorst git://people.freedesktop.org/~mlankhorst/linux git fetch --no-tags mlankhorst locking-rework git checkout 97ef20a5c69f47783e9b5a015348e0bfdc5863bf vim +/handle +746 drivers/gpu/drm/i915/gem/i915_gem_userptr.c 97ef20a5c69f47 drivers/gpu/drm/i915/gem/i915_gem_userptr.c Maarten Lankhorst 2020-09-11 700 a5a5ae2abe3ba7 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2018-02-08 701 /* 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 702 * Creates a new mm object that wraps some normal memory from the process 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 703 * context - user memory. 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 704 * 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 705 * We impose several restrictions upon the memory being mapped 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 706 * into the GPU. 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 707 * 1. It must be page aligned (both start/end addresses, i.e ptr and size). ec8b0dd51c50e3 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-07-21 708 * 2. It must be normal system memory, not a pointer into another map of IO 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 709 * space (e.g. it must not be a GTT mmapping of another object). ec8b0dd51c50e3 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-07-21 710 * 3. We only allow a bo as large as we could in theory map into the GTT, 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 711 * that is we limit the size to the total size of the GTT. ec8b0dd51c50e3 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-07-21 712 * 4. The bo is marked as being snoopable. The backing pages are left 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 713 * accessible directly by the CPU, but reads and writes by the GPU may 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 714 * incur the cost of a snoop (unless you have an LLC architecture). 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 715 * 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 716 * Synchronisation between multiple users and the GPU is left to userspace 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 717 * through the normal set-domain-ioctl. The kernel will enforce that the 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 718 * GPU relinquishes the VMA before it is returned back to the system 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 719 * i.e. upon free(), munmap() or process termination. However, the userspace 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 720 * malloc() library may not immediately relinquish the VMA after free() and 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 721 * instead reuse it whilst the GPU is still reading and writing to the VMA. 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 722 * Caveat emptor. 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 723 * 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 724 * Also note, that the object created here is not currently a "first class" 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 725 * object, in that several ioctls are banned. These are the CPU access 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 726 * ioctls: mmap(), pwrite and pread. In practice, you are expected to use cc917ab43541db drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2015-10-13 727 * direct access via your pointer rather than use those ioctls. Another cc917ab43541db drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2015-10-13 728 * restriction is that we do not allow userptr surfaces to be pinned to the cc917ab43541db drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2015-10-13 729 * hardware and so we reject any attempt to create a framebuffer out of a cc917ab43541db drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2015-10-13 730 * userptr. 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 731 * 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 732 * If you think this is a good interface to use to pass GPU memory between 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 733 * drivers, please use dma-buf instead. In fact, wherever possible use 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 734 * dma-buf instead. 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 735 */ 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 736 int a5a5ae2abe3ba7 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2018-02-08 737 i915_gem_userptr_ioctl(struct drm_device *dev, a5a5ae2abe3ba7 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2018-02-08 738 void *data, a5a5ae2abe3ba7 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2018-02-08 739 struct drm_file *file) 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 740 { 7867d709959927 drivers/gpu/drm/i915/gem/i915_gem_userptr.c Chris Wilson 2019-10-22 @741 static struct lock_class_key lock_class; 0031fb96859caa drivers/gpu/drm/i915/i915_gem_userptr.c Tvrtko Ursulin 2016-11-04 742 struct drm_i915_private *dev_priv = to_i915(dev); 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 743 struct drm_i915_gem_userptr *args = data; 97ef20a5c69f47 drivers/gpu/drm/i915/gem/i915_gem_userptr.c Maarten Lankhorst 2020-09-11 744 struct drm_i915_gem_object __maybe_unused *obj; 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 @745 int ret; 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 @746 u32 handle; 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 747 0031fb96859caa drivers/gpu/drm/i915/i915_gem_userptr.c Tvrtko Ursulin 2016-11-04 748 if (!HAS_LLC(dev_priv) && !HAS_SNOOP(dev_priv)) { ca377809d657ea drivers/gpu/drm/i915/i915_gem_userptr.c Tvrtko Ursulin 2016-03-02 749 /* We cannot support coherent userptr objects on hw without ca377809d657ea drivers/gpu/drm/i915/i915_gem_userptr.c Tvrtko Ursulin 2016-03-02 750 * LLC and broken snooping. ca377809d657ea drivers/gpu/drm/i915/i915_gem_userptr.c Tvrtko Ursulin 2016-03-02 751 */ ca377809d657ea drivers/gpu/drm/i915/i915_gem_userptr.c Tvrtko Ursulin 2016-03-02 752 return -ENODEV; ca377809d657ea drivers/gpu/drm/i915/i915_gem_userptr.c Tvrtko Ursulin 2016-03-02 753 } ca377809d657ea drivers/gpu/drm/i915/i915_gem_userptr.c Tvrtko Ursulin 2016-03-02 754 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 755 if (args->flags & ~(I915_USERPTR_READ_ONLY | 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 756 I915_USERPTR_UNSYNCHRONIZED)) 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 757 return -EINVAL; 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 758 24860ad748688b drivers/gpu/drm/i915/gem/i915_gem_userptr.c Matthew Auld 2020-01-17 759 /* 24860ad748688b drivers/gpu/drm/i915/gem/i915_gem_userptr.c Matthew Auld 2020-01-17 760 * XXX: There is a prevalence of the assumption that we fit the 24860ad748688b drivers/gpu/drm/i915/gem/i915_gem_userptr.c Matthew Auld 2020-01-17 761 * object's page count inside a 32bit _signed_ variable. Let's document 24860ad748688b drivers/gpu/drm/i915/gem/i915_gem_userptr.c Matthew Auld 2020-01-17 762 * this and catch if we ever need to fix it. In the meantime, if you do 24860ad748688b drivers/gpu/drm/i915/gem/i915_gem_userptr.c Matthew Auld 2020-01-17 763 * spot such a local variable, please consider fixing! 24860ad748688b drivers/gpu/drm/i915/gem/i915_gem_userptr.c Matthew Auld 2020-01-17 764 * 24860ad748688b drivers/gpu/drm/i915/gem/i915_gem_userptr.c Matthew Auld 2020-01-17 765 * Aside from our own locals (for which we have no excuse!): 24860ad748688b drivers/gpu/drm/i915/gem/i915_gem_userptr.c Matthew Auld 2020-01-17 766 * - sg_table embeds unsigned int for num_pages 24860ad748688b drivers/gpu/drm/i915/gem/i915_gem_userptr.c Matthew Auld 2020-01-17 767 * - get_user_pages*() mixed ints with longs 24860ad748688b drivers/gpu/drm/i915/gem/i915_gem_userptr.c Matthew Auld 2020-01-17 768 */ 24860ad748688b drivers/gpu/drm/i915/gem/i915_gem_userptr.c Matthew Auld 2020-01-17 769 24860ad748688b drivers/gpu/drm/i915/gem/i915_gem_userptr.c Matthew Auld 2020-01-17 770 if (args->user_size >> PAGE_SHIFT > INT_MAX) 24860ad748688b drivers/gpu/drm/i915/gem/i915_gem_userptr.c Matthew Auld 2020-01-17 771 return -E2BIG; 24860ad748688b drivers/gpu/drm/i915/gem/i915_gem_userptr.c Matthew Auld 2020-01-17 772 24860ad748688b drivers/gpu/drm/i915/gem/i915_gem_userptr.c Matthew Auld 2020-01-17 773 if (overflows_type(args->user_size, obj->base.size)) 24860ad748688b drivers/gpu/drm/i915/gem/i915_gem_userptr.c Matthew Auld 2020-01-17 774 return -E2BIG; 24860ad748688b drivers/gpu/drm/i915/gem/i915_gem_userptr.c Matthew Auld 2020-01-17 775 c11c7bfd213495 drivers/gpu/drm/i915/i915_gem_userptr.c Matthew Auld 2018-05-02 776 if (!args->user_size) c11c7bfd213495 drivers/gpu/drm/i915/i915_gem_userptr.c Matthew Auld 2018-05-02 777 return -EINVAL; c11c7bfd213495 drivers/gpu/drm/i915/i915_gem_userptr.c Matthew Auld 2018-05-02 778 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 779 if (offset_in_page(args->user_ptr | args->user_size)) 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 780 return -EINVAL; 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 781 96d4f267e40f95 drivers/gpu/drm/i915/i915_gem_userptr.c Linus Torvalds 2019-01-03 782 if (!access_ok((char __user *)(unsigned long)args->user_ptr, args->user_size)) 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 783 return -EFAULT; 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 784 97ef20a5c69f47 drivers/gpu/drm/i915/gem/i915_gem_userptr.c Maarten Lankhorst 2020-09-11 785 if (args->flags & I915_USERPTR_UNSYNCHRONIZED) 97ef20a5c69f47 drivers/gpu/drm/i915/gem/i915_gem_userptr.c Maarten Lankhorst 2020-09-11 786 return -ENODEV; 97ef20a5c69f47 drivers/gpu/drm/i915/gem/i915_gem_userptr.c Maarten Lankhorst 2020-09-11 787 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 788 if (args->flags & I915_USERPTR_READ_ONLY) { 0b100760e3e8cb drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2018-07-12 789 /* 0b100760e3e8cb drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2018-07-12 790 * On almost all of the older hw, we cannot tell the GPU that 0b100760e3e8cb drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2018-07-12 791 * a page is readonly. 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 792 */ e6ba76480299a0 drivers/gpu/drm/i915/gem/i915_gem_userptr.c Chris Wilson 2019-12-21 793 if (!dev_priv->gt.vm->has_read_only) 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 794 return -ENODEV; 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 795 } 5cc9ed4b9a7ac5 drivers/gpu/drm/i915/i915_gem_userptr.c Chris Wilson 2014-05-16 796 :::::: The code at line 746 was first introduced by commit :::::: 5cc9ed4b9a7ac579362ccebac67f7a4cdb36de06 drm/i915: Introduce mapping of user pages into video memory (userptr) ioctl :::::: TO: Chris Wilson <chris(a)chris-wilson.co.uk&gt; :::::: CC: Daniel Vetter <daniel.vetter(a)ffwll.ch&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org