tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS head: a48a35466505c8a52da57596944bd0b4485e825f commit: f39ebff66fab7eee91421258aa7254ee0bbac778 [1605/1605] block: support to dispatch bio asynchronously config: x86_64-randconfig-r112-20250430 (https://download.01.org/0day-ci/archive/20250430/202504302251.rkbjGYqc-lkp@i...) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250430/202504302251.rkbjGYqc-lkp@i...) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202504302251.rkbjGYqc-lkp@intel.com/ sparse warnings: (new ones prefixed by >>)

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block/blk-core.c:158:18: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const [noderef] __percpu *__vpp_verify @@ got struct bio_dispatch_async_ctl [noderef] __percpu ** @@ block/blk-core.c:158:18: sparse: expected void const [noderef] __percpu *__vpp_verify block/blk-core.c:158:18: sparse: got struct bio_dispatch_async_ctl [noderef] __percpu ** block/blk-core.c:158:17: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct bio_dispatch_async_ctl *ctl @@ got struct bio_dispatch_async_ctl [noderef] __percpu * @@ block/blk-core.c:158:17: sparse: expected struct bio_dispatch_async_ctl *ctl block/blk-core.c:158:17: sparse: got struct bio_dispatch_async_ctl [noderef] __percpu * block/blk-core.c:222:18: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const [noderef] __percpu *__vpp_verify @@ got struct bio_dispatch_async_ctl [noderef] __percpu ** @@ block/blk-core.c:222:18: sparse: expected void const [noderef] __percpu *__vpp_verify block/blk-core.c:222:18: sparse: got struct bio_dispatch_async_ctl [noderef] __percpu ** block/blk-core.c:222:17: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct bio_dispatch_async_ctl *ctl @@ got struct bio_dispatch_async_ctl [noderef] __percpu * @@ block/blk-core.c:222:17: sparse: expected struct bio_dispatch_async_ctl *ctl block/blk-core.c:222:17: sparse: got struct bio_dispatch_async_ctl [noderef] __percpu * block/blk-core.c:259:32: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct bio_dispatch_async_ctl [noderef] __percpu **static [toplevel] bio_dispatch_async_ctl @@ got struct bio_dispatch_async_ctl *[noderef] __percpu * @@ block/blk-core.c:259:32: sparse: expected struct bio_dispatch_async_ctl [noderef] __percpu **static [toplevel] bio_dispatch_async_ctl block/blk-core.c:259:32: sparse: got struct bio_dispatch_async_ctl *[noderef] __percpu * block/blk-core.c:269:18: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const [noderef] __percpu *__vpp_verify @@ got struct bio_dispatch_async_ctl [noderef] __percpu ** @@ block/blk-core.c:269:18: sparse: expected void const [noderef] __percpu *__vpp_verify block/blk-core.c:269:18: sparse: got struct bio_dispatch_async_ctl [noderef] __percpu ** block/blk-core.c:269:59: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct bio_dispatch_async_ctl [noderef] __percpu * @@ got struct bio_dispatch_async_ctl *ctl @@ block/blk-core.c:269:59: sparse: expected struct bio_dispatch_async_ctl [noderef] __percpu * block/blk-core.c:269:59: sparse: got struct bio_dispatch_async_ctl *ctl block/blk-core.c: note: in included file: include/linux/backing-dev.h:511:19: sparse: sparse: incompatible types in comparison expression (different address spaces): include/linux/backing-dev.h:511:19: sparse: struct rcu_device [noderef] __rcu * include/linux/backing-dev.h:511:19: sparse: struct rcu_device * block/blk-core.c: In function 'blk_account_io_completion': block/blk-core.c:2999:21: warning: variable 'cpu' set but not used [-Wunused-but-set-variable] 2999 | int cpu; | ^~~

vim +158 block/blk-core.c 152 153 static int bio_dispatch_work(void *data) 154 { 155 int loop_count = 0; 156 int cpu = smp_processor_id(); 157 struct bio_dispatch_async_ctl *ctl =

158 *per_cpu_ptr(bio_dispatch_async_ctl, cpu); 159 160 for (;; loop_count++) { 161 struct bio_list bio_list_on_stack; 162 struct blk_plug plug; 163 struct bio *bio; 164 int count; 165 166 bio_list_init(&bio_list_on_stack); 167 count = collect_bio(ctl, &bio_list_on_stack); 168 169 if (!count) { 170 DEFINE_WAIT(wait); 171 172 for (;;) { 173 prepare_to_wait(&ctl->wait, &wait, 174 TASK_INTERRUPTIBLE); 175 count = collect_bio(ctl, &bio_list_on_stack); 176 if (count) 177 break; 178 schedule(); 179 loop_count = 0; 180 } 181 finish_wait(&ctl->wait, &wait); 182 183 } 184 185 blk_start_plug(&plug); 186 while ((bio = bio_list_pop(&bio_list_on_stack))) { 187 struct request_queue *q = bio->bi_disk->queue; 188 189 q->make_request_fn(q, bio); 190 } 191 blk_finish_plug(&plug); 192 193 /* prevent soft lockup */ 194 if (loop_count >= BIO_DISPATCH_MAX_LOOP) { 195 loop_count = 0; 196 cond_resched(); 197 } 198 } 199 200 return 0; 201 } 202 203 static int get_dispatch_cpu(struct request_queue *q, int cpu) 204 { 205 int *last_dispatch_cpu = per_cpu_ptr(q->last_dispatch_cpu, cpu); 206 207 cpu = cpumask_next(*last_dispatch_cpu, &q->dispatch_async_cpus); 208 if (cpu >= nr_cpu_ids) 209 cpu = cpumask_first(&q->dispatch_async_cpus); 210 211 *last_dispatch_cpu = cpu; 212 213 return cpu; 214 } 215 216 static void blk_queue_make_request_async(struct bio *bio) 217 { 218 struct request_queue *q = bio->bi_disk->queue; 219 int cpu = smp_processor_id(); 220 int dispatch_cpu = get_dispatch_cpu(q, cpu); 221 struct bio_dispatch_async_ctl *ctl = 222 *per_cpu_ptr(bio_dispatch_async_ctl, dispatch_cpu); 223 224 spin_lock_irq(bio_async_lock(ctl, cpu)); 225 bio_list_add(bio_async_list(ctl, cpu), bio); 226 spin_unlock_irq(bio_async_lock(ctl, cpu)); 227 228 if (wq_has_sleeper(&ctl->wait)) 229 wake_up(&ctl->wait); 230 } 231 232 static blk_qc_t blk_queue_do_make_request(struct bio *bio) 233 { 234 struct request_queue *q = bio->bi_disk->queue; 235 int cpu = smp_processor_id(); 236 237 /* 238 * Don't dispatch bio asynchronously in following cases: 239 * 240 * 1) QUEUE_FLAG_DISPATCH_ASYNC is not set; 241 * 2) current cpu is the target cpu; 242 * 3) bio is flagged no wait; 243 * 4) TODO: return value of submit_bio() will be used in io polling. 244 */ 245 if (!test_bit(QUEUE_FLAG_DISPATCH_ASYNC, &q->queue_flags) || 246 cpumask_test_cpu(cpu, &q->dispatch_async_cpus) || 247 bio->bi_opf & REQ_NOWAIT) 248 return q->make_request_fn(q, bio); 249 250 /* return value is not concerned */ 251 blk_queue_make_request_async(bio); 252 return BLK_QC_T_NONE; 253 } 254 255 static void init_blk_queue_async_dispatch(void) 256 { 257 int cpu; 258 259 bio_dispatch_async_ctl = alloc_percpu(struct bio_dispatch_async_ctl *); 260 if (!bio_dispatch_async_ctl) 261 panic("Failed to alloc bio_dispatch_async_ctl\n"); 262 263 for_each_possible_cpu(cpu) { 264 int i; 265 struct bio_dispatch_async_ctl *ctl = 266 kmalloc(sizeof(struct bio_dispatch_async_ctl), 267 GFP_KERNEL | __GFP_NOFAIL); 268 269 *per_cpu_ptr(bio_dispatch_async_ctl, cpu) = ctl; 270 271 ctl->thread = 272 kthread_create_on_cpu(bio_dispatch_work, NULL, cpu, 273 "bio_dispatch_work_%u"); 274 if (IS_ERR_OR_NULL(ctl->thread)) 275 panic("Failed to create bio dispatch thread\n"); 276 277 ctl->list = kmalloc_array(nr_cpu_ids, 278 sizeof(struct bio_list) << BIO_ASYNC_LIST_SHIFT, 279 GFP_KERNEL | __GFP_NOFAIL); 280 ctl->lock = kmalloc_array(nr_cpu_ids, 281 sizeof(spinlock_t) << BIO_ASYNC_LOCK_SHIFT, 282 GFP_KERNEL | __GFP_NOFAIL); 283 for (i = 0; i < nr_cpu_ids; ++i) { 284 bio_list_init(bio_async_list(ctl, i)); 285 spin_lock_init(bio_async_lock(ctl, i)); 286 } 287 288 wake_up_process(ctl->thread); 289 init_waitqueue_head(&ctl->wait); 290 } 291 } 292

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