Hi John, I love your patch! Perhaps something to improve: [auto build test WARNING on next-20200908] [cannot apply to linux/master linus/master pmladek/for-next v5.9-rc4 v5.9-rc3 v5.9-rc2 v5.9-rc4] [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/John-Ogness/printk-reimplement-LOG_CONT-handling/20200909-115852 base: dff9f829e5b0181d4ed9d35aa62d695292399b54 config: mips-randconfig-r035-20200909 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 8893d0816ccdf8998d2e21b5430e9d6abe7ef465) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> kernel/printk/printk_ringbuffer.c:1398:28: warning: format specifies type 'unsigned short' but the argument has type 'unsigned int' [-Wformat] d->info.text_len, data_size); ^~~~~~~~~ include/linux/printk.h:472:42: note: expanded from macro 'pr_warn_once' printk_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) ~~~ ^~~~~~~~~~~ include/linux/printk.h:441:17: note: expanded from macro 'printk_once' printk(fmt, ##__VA_ARGS__); \ ~~~ ^~~~~~~~~~~ >> kernel/printk/printk_ringbuffer.c:1385:23: warning: variable 'data_size' is uninitialized when used here [-Wuninitialized] d->info.text_len = data_size; ^~~~~~~~~ kernel/printk/printk_ringbuffer.c:1349:24: note: initialize the variable 'data_size' to silence this warning unsigned int data_size; ^ = 0 2 warnings generated. # https://github.com/0day-ci/linux/commit/4b08e95d4858fb7e2fe1732aa7f4f6f6881eac91 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review John-Ogness/printk-reimplement-LOG_CONT-handling/20200909-115852 git checkout 4b08e95d4858fb7e2fe1732aa7f4f6f6881eac91 vim +1398 kernel/printk/printk_ringbuffer.c 1299 1300 /** 1301 * prb_reserve_in_last() - Re-reserve and extend the space in the ringbuffer 1302 * used by the newest record. 1303 * 1304 * @e: The entry structure to setup. 1305 * @rb: The ringbuffer to re-reserve and extend data in. 1306 * @r: The record structure to allocate buffers for. 1307 * @caller_id: The caller ID of the caller (reserving writer). 1308 * 1309 * This is the public function available to writers to re-reserve and extend 1310 * data. 1311 * 1312 * The writer specifies the text size to extend (not the new total size) by 1313 * setting the @text_buf_size field of @r. Extending dictionaries is not 1314 * supported, so @dict_buf_size of @r should be set to 0. To ensure proper 1315 * initialization of @r, prb_rec_init_wr() should be used. 1316 * 1317 * This function will fail if @caller_id does not match the caller ID of the 1318 * newest record. In that case the caller must reserve new data using 1319 * prb_reserve(). 1320 * 1321 * Context: Any context. Disables local interrupts on success. 1322 * Return: true if text data could be extended, otherwise false. 1323 * 1324 * On success: 1325 * 1326 * - @r->text_buf points to the beginning of the entire text buffer. 1327 * 1328 * - @r->text_buf_size is set to the new total size of the buffer. 1329 * 1330 * - @r->dict_buf and @r->dict_buf_size are cleared because extending 1331 * the dict buffer is not supported. 1332 * 1333 * - @r->info is not touched so that @r->info->text_len could be used 1334 * to append the text. 1335 * 1336 * - prb_record_text_space() can be used on @e to query the new 1337 * actually used space. 1338 * 1339 * Important: All @r->info fields will already be set with the current values 1340 * for the record. I.e. @r->info->text_len will be less than 1341 * @text_buf_size and @r->info->dict_len may be set, even though 1342 * @dict_buf_size is 0. Writers can use @r->info->text_len to know 1343 * where concatenation begins and writers should update 1344 * @r->info->text_len after concatenating. 1345 */ 1346 bool prb_reserve_in_last(struct prb_reserved_entry *e, struct printk_ringbuffer *rb, 1347 struct printk_record *r, u32 caller_id) 1348 { 1349 unsigned int data_size; 1350 struct prb_desc *d; 1351 unsigned long id; 1352 1353 local_irq_save(e->irqflags); 1354 1355 /* Transition the newest descriptor back to the reserved state. */ 1356 d = desc_reopen_last(&rb->desc_ring, caller_id, &id); 1357 if (!d) { 1358 local_irq_restore(e->irqflags); 1359 goto fail_reopen; 1360 } 1361 1362 /* Now the writer has exclusive access: LMM(prb_reserve_in_last:A) */ 1363 1364 /* 1365 * Set the @e fields here so that prb_commit() can be used if 1366 * anything fails from now on. 1367 */ 1368 e->rb = rb; 1369 e->id = id; 1370 1371 /* 1372 * desc_reopen_last() checked the caller_id, but there was no 1373 * exclusive access at that point. The descriptor may have 1374 * changed since then. 1375 */ 1376 if (caller_id != d->info.caller_id) 1377 goto fail; 1378 1379 if (BLK_DATALESS(&d->text_blk_lpos)) { 1380 r->text_buf = data_alloc(rb, &rb->text_data_ring, r->text_buf_size, 1381 &d->text_blk_lpos, id); 1382 if (WARN_ON_ONCE(d->info.text_len != 0)) { 1383 pr_warn_once("wrong text_len value (%u, expecting 0)\n", 1384 d->info.text_len); > 1385 d->info.text_len = data_size; 1386 } 1387 } else { 1388 if (!get_data(&rb->text_data_ring, &d->text_blk_lpos, &data_size)) 1389 goto fail; 1390 1391 /* 1392 * Increase the buffer size to include the original size. If 1393 * the meta data (@text_len) is not sane, use the full data 1394 * block size. 1395 */ 1396 if (WARN_ON_ONCE(d->info.text_len > data_size)) { 1397 pr_warn_once("wrong text_len value (%u, expecting <=%hu)\n", > 1398 d->info.text_len, data_size); 1399 d->info.text_len = data_size; 1400 } 1401 r->text_buf_size += d->info.text_len; 1402 1403 if (!data_check_size(&rb->text_data_ring, r->text_buf_size)) 1404 goto fail; 1405 1406 r->text_buf = data_realloc(rb, &rb->text_data_ring, r->text_buf_size, 1407 &d->text_blk_lpos, id); 1408 } 1409 if (r->text_buf_size && !r->text_buf) 1410 goto fail; 1411 1412 /* Although dictionary data may be in use, it cannot be extended. */ 1413 r->dict_buf = NULL; 1414 r->dict_buf_size = 0; 1415 1416 r->info = &d->info; 1417 1418 e->text_space = space_used(&rb->text_data_ring, &d->text_blk_lpos); 1419 1420 return true; 1421 fail: 1422 prb_commit(e); 1423 /* prb_commit() re-enabled interrupts. */ 1424 fail_reopen: 1425 /* Make it clear to the caller that the re-reserve failed. */ 1426 memset(r, 0, sizeof(*r)); 1427 return false; 1428 } 1429 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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