Hi Daniel,

I love your 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 v5.14-rc3 next-20210730]
[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/Daniel-Vetter/remove-rcu-support-from-i915_address_space/20210802-234929
base:   git://anongit.freedesktop.org/drm/drm-tip drm-tip
config: i386-randconfig-s002-20210802 (attached as .config)
compiler: gcc-10 (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-341-g8af24329-dirty
        # 
https://github.com/0day-ci/linux/commit/4a70c02a8b49ee9845e8222c55b4bf932e843224
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review 
Daniel-Vetter/remove-rcu-support-from-i915_address_space/20210802-234929
        git checkout 4a70c02a8b49ee9845e8222c55b4bf932e843224
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir 
ARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <l...@intel.com>


sparse warnings: (new ones prefixed by >>)
   drivers/gpu/drm/i915/gem/i915_gem_context.c: note: in included file (through 
drivers/gpu/drm/i915/gt/intel_gt_requests.h, 
drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c):
   /usr/lib/gcc/x86_64-linux-gnu/10/include/stddef.h:406:9: sparse: sparse: 
preprocessor token offsetof redefined
   drivers/gpu/drm/i915/gem/i915_gem_context.c: note: in included file (through 
include/uapi/linux/posix_types.h, include/uapi/linux/types.h, 
include/linux/types.h, ...):
   include/linux/stddef.h:17:9: sparse: this was the original definition
   drivers/gpu/drm/i915/gem/i915_gem_context.c: note: in included file:
>> drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c:698:33: sparse: 
>> sparse: incompatible types in comparison expression (different address 
>> spaces):
>> drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c:698:33: sparse:    
>> struct i915_address_space [noderef] __rcu *
>> drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c:698:33: sparse:    
>> struct i915_address_space *

vim +698 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c

f2085c8e950d53 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-08-27  631  
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  632  static int igt_ctx_exec(void *arg)
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  633  {
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  634     struct drm_i915_private *i915 = arg;
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  635     struct intel_engine_cs *engine;
6e1281412ab9e6 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-11-14  636     int err = -ENODEV;
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  637  
0fdbe58c4a0f8c drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2018-07-06  638     /*
0fdbe58c4a0f8c drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2018-07-06  639      * Create a few different contexts (with different 
mm) and write
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  640      * through each ctx/mm using the GPU making sure 
those writes end
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  641      * up in the expected pages of our obj.
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  642      */
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  643  
0fdbe58c4a0f8c drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2018-07-06  644     if (!DRIVER_CAPS(i915)->has_logical_contexts)
0fdbe58c4a0f8c drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2018-07-06  645             return 0;
0fdbe58c4a0f8c drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2018-07-06  646  
51757cf4d7e6e1 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Tvrtko 
Ursulin 2019-10-22  647     for_each_uabi_engine(engine, i915) {
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  648             struct drm_i915_gem_object *obj = NULL;
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  649             unsigned long ncontexts, ndwords, dw;
f2085c8e950d53 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-08-27  650             struct i915_request *tq[5] = {};
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  651             struct igt_live_test t;
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  652             IGT_TIMEOUT(end_time);
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  653             LIST_HEAD(objects);
a8c9a7f52ec5a4 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-11-07  654             struct file *file;
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  655  
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  656             if (!intel_engine_can_store_dword(engine))
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  657                     continue;
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  658  
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  659             if (!engine->context_size)
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  660                     continue; /* No logical context 
support in HW */
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  661  
ef47a0e0f49d53 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-03-13  662             file = mock_file(i915);
ef47a0e0f49d53 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-03-13  663             if (IS_ERR(file))
ef47a0e0f49d53 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-03-13  664                     return PTR_ERR(file);
ef47a0e0f49d53 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-03-13  665  
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  666             err = igt_live_test_begin(&t, i915, 
__func__, engine->name);
8dd0f8d37eaec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2018-10-12  667             if (err)
a4e7ccdac38ec8 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-10-04  668                     goto out_file;
8dd0f8d37eaec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2018-10-12  669  
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  670             ncontexts = 0;
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  671             ndwords = 0;
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  672             dw = 0;
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  673             while (!time_after(jiffies, end_time)) {
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  674                     struct i915_gem_context *ctx;
75b974a859e5d9 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-08-24  675                     struct intel_context *ce;
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  676  
5888d588597408 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Jason 
Ekstrand 2021-07-08  677                     ctx = kernel_context(i915, NULL);
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  678                     if (IS_ERR(ctx)) {
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  679                             err = PTR_ERR(ctx);
a4e7ccdac38ec8 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-10-04  680                             goto out_file;
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  681                     }
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  682  
75b974a859e5d9 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-08-24  683                     ce = 
i915_gem_context_get_engine(ctx, engine->legacy_idx);
21b0c32bdaba7c drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-08-27  684                     GEM_BUG_ON(IS_ERR(ce));
75b974a859e5d9 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-08-24  685  
ca83d5840cb641 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-05-23  686                     if (!obj) {
75b974a859e5d9 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-08-24  687                             obj = 
create_test_object(ce->vm, file, &objects);
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  688                             if (IS_ERR(obj)) {
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  689                                     err = PTR_ERR(obj);
75b974a859e5d9 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-08-24  690                                     
intel_context_put(ce);
c4e6488120e9ef drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-08-27  691                                     
kernel_context_close(ctx);
a4e7ccdac38ec8 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-10-04  692                                     goto out_file;
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  693                             }
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  694                     }
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  695  
75b974a859e5d9 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-08-24  696                     err = gpu_fill(ce, obj, dw);
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  697                     if (err) {
2935ed5339c495 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-10-04 @698                             pr_err("Failed to fill 
dword %lu [%lu/%lu] with gpu (%s) [full-ppgtt? %s], err=%d\n",
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  699                                    ndwords, dw, 
max_dwords(obj),
2935ed5339c495 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-10-04  700                                    engine->name,
a4e7ccdac38ec8 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-10-04  701                                    
yesno(!!rcu_access_pointer(ctx->vm)),
a4e7ccdac38ec8 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-10-04  702                                    err);
f2085c8e950d53 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-08-27  703                             intel_context_put(ce);
c4e6488120e9ef drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-08-27  704                             kernel_context_close(ctx);
a4e7ccdac38ec8 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-10-04  705                             goto out_file;
f2085c8e950d53 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-08-27  706                     }
f2085c8e950d53 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-08-27  707  
f2085c8e950d53 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-08-27  708                     err = throttle(ce, tq, 
ARRAY_SIZE(tq));
f2085c8e950d53 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-08-27  709                     if (err) {
f2085c8e950d53 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-08-27  710                             intel_context_put(ce);
c4e6488120e9ef drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-08-27  711                             kernel_context_close(ctx);
a4e7ccdac38ec8 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-10-04  712                             goto out_file;
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  713                     }
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  714  
ca83d5840cb641 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-05-23  715                     if (++dw == max_dwords(obj)) {
ca83d5840cb641 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-05-23  716                             obj = NULL;
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  717                             dw = 0;
ca83d5840cb641 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-05-23  718                     }
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  719  
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  720                     ndwords++;
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  721                     ncontexts++;
f2085c8e950d53 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-08-27  722  
f2085c8e950d53 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-08-27  723                     intel_context_put(ce);
c4e6488120e9ef drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-08-27  724                     kernel_context_close(ctx);
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  725             }
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  726  
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  727             pr_info("Submitted %lu contexts to %s, 
filling %lu dwords\n",
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  728                     ncontexts, engine->name, ndwords);
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  729  
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  730             ncontexts = dw = 0;
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  731             list_for_each_entry(obj, &objects, 
st_link) {
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  732                     unsigned int rem =
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  733                             min_t(unsigned int, 
ndwords - dw, max_dwords(obj));
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  734  
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  735                     err = cpu_check(obj, ncontexts++, 
rem);
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  736                     if (err)
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  737                             break;
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  738  
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  739                     dw += rem;
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  740             }
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  741  
a4e7ccdac38ec8 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-10-04  742  out_file:
f2085c8e950d53 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-08-27  743             throttle_release(tq, ARRAY_SIZE(tq));
e4a8c8130ba3ac drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-01-21  744             if (igt_live_test_end(&t))
7c2f5bc5f0f41a drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2018-05-05  745                     err = -EIO;
791ff39ae32a34 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2017-02-13  746  
a8c9a7f52ec5a4 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-11-07  747             fput(file);
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  748             if (err)
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  749                     return err;
6582f4f613e352 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-07-04  750  
6582f4f613e352 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c Chris 
Wilson   2019-07-04  751             i915_gem_drain_freed_objects(i915);
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  752     }
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  753  
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  754     return 0;
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  755  }
e0695db7298ec2 drivers/gpu/drm/i915/selftests/i915_gem_context.c     Chris 
Wilson   2019-03-22  756  

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