On Tue, May 04, 2021 at 02:52:03AM +0800, kernel test robot wrote: > Hi Jason, > > Thank you for the patch! Perhaps something to improve: > > [auto build test WARNING on drm-intel/for-linux-next] > [also build test WARNING on drm-tip/drm-tip drm-exynos/exynos-drm-next next-20210503] > [cannot apply to tegra-drm/drm/tegra/for-next drm/drm-next v5.12] > [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/drm-i915-gem-ioctl-clean-ups-v5/20210504-000132 > base: git://anongit.freedesktop.org/drm-intel for-linux-next > config: i386-randconfig-s002-20210503 (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/6af12f5ca765ecd59075344f3be4c4c0b68ef95e > git remote add linux-review https://github.com/0day-ci/linux > git fetch --no-tags linux-review Jason-Ekstrand/drm-i915-gem-ioctl-clean-ups-v5/20210504-000132 > git checkout 6af12f5ca765ecd59075344f3be4c4c0b68ef95e > # save the attached .config to linux build tree > make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=i386 > > If you fix the issue, kindly add following tag as appropriate > Reported-by: kernel test robot <lkp@xxxxxxxxx> Just from staring at this I have no idea, so I guess you have to reproduce. What sparse does is primarily check these special bit and pointer values the kernel has, like __rcu and __user, where you need special functions to access them. But since the code is using rcu_dereference I have no idea what the complaint is about. -Daniel > > > sparse warnings: (new ones prefixed by >>) > drivers/gpu/drm/i915/gt/intel_reset.c:1329:5: sparse: sparse: context imbalance in 'intel_gt_reset_trylock' - different lock contexts for basic block > drivers/gpu/drm/i915/gt/intel_reset.c: note: in included file: > >> drivers/gpu/drm/i915/gem/i915_gem_context.h:163:14: sparse: sparse: incompatible types in comparison expression (different address spaces): > >> drivers/gpu/drm/i915/gem/i915_gem_context.h:163:14: sparse: struct i915_address_space [noderef] __rcu * > >> drivers/gpu/drm/i915/gem/i915_gem_context.h:163:14: sparse: struct i915_address_space * > -- > drivers/gpu/drm/i915/gt/intel_execlists_submission.c: note: in included file (through drivers/gpu/drm/i915/selftests/igt_spinner.h, drivers/gpu/drm/i915/gt/selftest_execlists.c): > >> drivers/gpu/drm/i915/gem/i915_gem_context.h:163:14: sparse: sparse: incompatible types in comparison expression (different address spaces): > >> drivers/gpu/drm/i915/gem/i915_gem_context.h:163:14: sparse: struct i915_address_space [noderef] __rcu * > >> drivers/gpu/drm/i915/gem/i915_gem_context.h:163:14: sparse: struct i915_address_space * > -- > drivers/gpu/drm/i915/gem/i915_gem_object.c: note: in included file: > >> drivers/gpu/drm/i915/gem/i915_gem_context.h:163:14: sparse: sparse: incompatible types in comparison expression (different address spaces): > >> drivers/gpu/drm/i915/gem/i915_gem_context.h:163:14: sparse: struct i915_address_space [noderef] __rcu * > >> drivers/gpu/drm/i915/gem/i915_gem_context.h:163:14: sparse: struct i915_address_space * > >> drivers/gpu/drm/i915/gem/i915_gem_context.h:163:14: sparse: sparse: incompatible types in comparison expression (different address spaces): > >> drivers/gpu/drm/i915/gem/i915_gem_context.h:163:14: sparse: struct i915_address_space [noderef] __rcu * > >> drivers/gpu/drm/i915/gem/i915_gem_context.h:163:14: sparse: struct i915_address_space * > drivers/gpu/drm/i915/gem/i915_gem_context.h:154:16: sparse: sparse: incompatible types in comparison expression (different address spaces): > drivers/gpu/drm/i915/gem/i915_gem_context.h:154:16: sparse: struct i915_address_space [noderef] __rcu * > drivers/gpu/drm/i915/gem/i915_gem_context.h:154:16: sparse: struct i915_address_space * > -- > drivers/gpu/drm/i915/i915_gem_gtt.c: note: in included file (through drivers/gpu/drm/i915/selftests/i915_gem_gtt.c): > >> drivers/gpu/drm/i915/gem/i915_gem_context.h:163:14: sparse: sparse: incompatible types in comparison expression (different address spaces): > >> drivers/gpu/drm/i915/gem/i915_gem_context.h:163:14: sparse: struct i915_address_space [noderef] __rcu * > >> drivers/gpu/drm/i915/gem/i915_gem_context.h:163:14: sparse: struct i915_address_space * > >> drivers/gpu/drm/i915/gem/i915_gem_context.h:163:14: sparse: sparse: incompatible types in comparison expression (different address spaces): > >> drivers/gpu/drm/i915/gem/i915_gem_context.h:163:14: sparse: struct i915_address_space [noderef] __rcu * > >> drivers/gpu/drm/i915/gem/i915_gem_context.h:163:14: sparse: struct i915_address_space * > -- > drivers/gpu/drm/i915/i915_vma.c: note: in included file: > >> drivers/gpu/drm/i915/selftests/i915_vma.c:42:24: sparse: sparse: incompatible types in comparison expression (different address spaces): > >> drivers/gpu/drm/i915/selftests/i915_vma.c:42:24: sparse: struct i915_address_space [noderef] __rcu * > >> drivers/gpu/drm/i915/selftests/i915_vma.c:42:24: sparse: struct i915_address_space * > drivers/gpu/drm/i915/i915_vma.c: note: in included file (through drivers/gpu/drm/i915/selftests/i915_vma.c): > >> drivers/gpu/drm/i915/gem/i915_gem_context.h:163:14: sparse: sparse: incompatible types in comparison expression (different address spaces): > >> drivers/gpu/drm/i915/gem/i915_gem_context.h:163:14: sparse: struct i915_address_space [noderef] __rcu * > >> drivers/gpu/drm/i915/gem/i915_gem_context.h:163:14: sparse: struct i915_address_space * > > vim +163 drivers/gpu/drm/i915/gem/i915_gem_context.h > > a4e7ccdac38ec8 Chris Wilson 2019-10-04 156 > a4e7ccdac38ec8 Chris Wilson 2019-10-04 157 static inline struct i915_address_space * > a4e7ccdac38ec8 Chris Wilson 2019-10-04 158 i915_gem_context_get_vm_rcu(struct i915_gem_context *ctx) > a4e7ccdac38ec8 Chris Wilson 2019-10-04 159 { > a4e7ccdac38ec8 Chris Wilson 2019-10-04 160 struct i915_address_space *vm; > a4e7ccdac38ec8 Chris Wilson 2019-10-04 161 > a4e7ccdac38ec8 Chris Wilson 2019-10-04 162 rcu_read_lock(); > a4e7ccdac38ec8 Chris Wilson 2019-10-04 @163 vm = rcu_dereference(ctx->vm); > a4e7ccdac38ec8 Chris Wilson 2019-10-04 164 if (!vm) > a4e7ccdac38ec8 Chris Wilson 2019-10-04 165 vm = &ctx->i915->ggtt.vm; > a4e7ccdac38ec8 Chris Wilson 2019-10-04 166 vm = i915_vm_get(vm); > a4e7ccdac38ec8 Chris Wilson 2019-10-04 167 rcu_read_unlock(); > a4e7ccdac38ec8 Chris Wilson 2019-10-04 168 > a4e7ccdac38ec8 Chris Wilson 2019-10-04 169 return vm; > a4e7ccdac38ec8 Chris Wilson 2019-10-04 170 } > a4e7ccdac38ec8 Chris Wilson 2019-10-04 171 > > --- > 0-DAY CI Kernel Test Service, Intel Corporation > https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/intel-gfx -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
