Hi "Christian, url: https://github.com/0day-ci/linux/commits/Christian-K-nig/drm-ttm-move-swapout-logic-around/20210210-232812 base: git://anongit.freedesktop.org/drm/drm-tip drm-tip config: ia64-randconfig-m031-20210209 (attached as .config) compiler: ia64-linux-gcc (GCC) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> New smatch warnings: drivers/gpu/drm/ttm/ttm_device.c:144 ttm_device_swapout() warn: variable dereferenced before check 'bo->ttm' (see line 142) vim +144 drivers/gpu/drm/ttm/ttm_device.c d37e3072dc32c7 Christian König 2021-02-10 125 long ttm_device_swapout(struct ttm_device *bdev, struct ttm_operation_ctx *ctx, d37e3072dc32c7 Christian König 2021-02-10 126 gfp_t gfp_flags) d37e3072dc32c7 Christian König 2021-02-10 127 { d37e3072dc32c7 Christian König 2021-02-10 128 struct ttm_global *glob = &ttm_glob; d37e3072dc32c7 Christian König 2021-02-10 129 struct ttm_resource_manager *man; 22b09b650f7486 Christian König 2021-02-10 130 struct ttm_buffer_object *bo; d37e3072dc32c7 Christian König 2021-02-10 131 unsigned i, j; 22b09b650f7486 Christian König 2021-02-10 132 int ret; 22b09b650f7486 Christian König 2021-02-10 133 22b09b650f7486 Christian König 2021-02-10 134 spin_lock(&glob->lru_lock); d37e3072dc32c7 Christian König 2021-02-10 135 for (i = TTM_PL_SYSTEM; i < TTM_NUM_MEM_TYPES; ++i) { d37e3072dc32c7 Christian König 2021-02-10 136 man = ttm_manager_type(bdev, i); d37e3072dc32c7 Christian König 2021-02-10 137 if (!man || !man->use_tt) d37e3072dc32c7 Christian König 2021-02-10 138 continue; d37e3072dc32c7 Christian König 2021-02-10 139 d37e3072dc32c7 Christian König 2021-02-10 140 for (j = 0; j < TTM_MAX_BO_PRIORITY; ++j) { d37e3072dc32c7 Christian König 2021-02-10 141 list_for_each_entry(bo, &man->lru[j], lru) { d37e3072dc32c7 Christian König 2021-02-10 @142 long num_pages = bo->ttm->num_pages; ^^^^^^^^^ Dereferenced d37e3072dc32c7 Christian König 2021-02-10 143 d37e3072dc32c7 Christian König 2021-02-10 @144 if (!bo->ttm || ^^^^^^^^ Checked too late d37e3072dc32c7 Christian König 2021-02-10 145 bo->ttm->page_flags & TTM_PAGE_FLAG_SG || d37e3072dc32c7 Christian König 2021-02-10 146 bo->ttm->page_flags & TTM_PAGE_FLAG_SWAPPED) d37e3072dc32c7 Christian König 2021-02-10 147 continue; 22b09b650f7486 Christian König 2021-02-10 148 22b09b650f7486 Christian König 2021-02-10 149 ret = ttm_bo_swapout(bo, ctx, gfp_flags); 22b09b650f7486 Christian König 2021-02-10 150 /* ttm_bo_swapout has dropped the lru_lock */ 22b09b650f7486 Christian König 2021-02-10 151 if (!ret) 22b09b650f7486 Christian König 2021-02-10 152 return num_pages; 22b09b650f7486 Christian König 2021-02-10 153 if (ret != -EBUSY) 22b09b650f7486 Christian König 2021-02-10 154 return ret; 22b09b650f7486 Christian König 2021-02-10 155 } 22b09b650f7486 Christian König 2021-02-10 156 } d37e3072dc32c7 Christian König 2021-02-10 157 } 22b09b650f7486 Christian König 2021-02-10 158 spin_unlock(&glob->lru_lock); 22b09b650f7486 Christian König 2021-02-10 159 return 0; 22b09b650f7486 Christian König 2021-02-10 160 } --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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