Hi Andy, I love your patch! Perhaps something to improve: [auto build test WARNING on gpio/for-next] [also build test WARNING on v5.9-rc4 next-20200910] [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/Andy-Shevchenko/gpiolib-Fix-line... base: https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git for-next config: ia64-randconfig-s032-20200909 (attached as .config) compiler: ia64-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.2-191-g10164920-dirty # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=ia64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) drivers/gpio/gpiolib-cdev.c:432:41: sparse: sparse: Expected } at end of struct-union-enum-specifier drivers/gpio/gpiolib-cdev.c:432:41: sparse: sparse: got timestamp drivers/gpio/gpiolib-cdev.c:446:17: sparse: sparse: Expected ) in function declarator drivers/gpio/gpiolib-cdev.c:446:17: sparse: sparse: got && drivers/gpio/gpiolib-cdev.c:449:9: sparse: sparse: Expected ; at the end of type declaration drivers/gpio/gpiolib-cdev.c:449:9: sparse: sparse: got } drivers/gpio/gpiolib-cdev.c:452:1: sparse: sparse: Expected ; at the end of type declaration drivers/gpio/gpiolib-cdev.c:452:1: sparse: sparse: got } drivers/gpio/gpiolib-cdev.c:467:19: sparse: sparse: Expected ) in function declarator drivers/gpio/gpiolib-cdev.c:467:19: sparse: sparse: got < drivers/gpio/gpiolib-cdev.c:467:9: sparse: sparse: Trying to use reserved word 'if' as identifier drivers/gpio/gpiolib-cdev.c:470:12: sparse: sparse: Expected ; at end of declaration drivers/gpio/gpiolib-cdev.c:470:12: sparse: sparse: got { drivers/gpio/gpiolib-cdev.c:472:21: sparse: sparse: Expected ) in function declarator drivers/gpio/gpiolib-cdev.c:472:21: sparse: sparse: got ( drivers/gpio/gpiolib-cdev.c:472:17: sparse: sparse: Trying to use reserved word 'if' as identifier drivers/gpio/gpiolib-cdev.c:472:21: sparse: sparse: Expected ; at end of declaration drivers/gpio/gpiolib-cdev.c:472:21: sparse: sparse: got -> drivers/gpio/gpiolib-cdev.c:472:21: sparse: sparse: Expected ; at the end of type declaration drivers/gpio/gpiolib-cdev.c:472:21: sparse: sparse: got } drivers/gpio/gpiolib-cdev.c:475:40: sparse: sparse: Expected ; at end of declaration drivers/gpio/gpiolib-cdev.c:475:40: sparse: sparse: got bytes_read drivers/gpio/gpiolib-cdev.c:476:25: sparse: sparse: Expected ; at the end of type declaration drivers/gpio/gpiolib-cdev.c:476:25: sparse: sparse: got } drivers/gpio/gpiolib-cdev.c:480:33: sparse: sparse: Trying to use reserved word 'return' as identifier drivers/gpio/gpiolib-cdev.c:480:40: sparse: sparse: Expected ; at end of declaration drivers/gpio/gpiolib-cdev.c:480:40: sparse: sparse: got - drivers/gpio/gpiolib-cdev.c:481:25: sparse: sparse: Expected ; at the end of type declaration drivers/gpio/gpiolib-cdev.c:481:25: sparse: sparse: got } drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ; at end of declaration drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: got -> drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ; at the end of type declaration drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: got } drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ) in function declarator drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: got 0 drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Trying to use reserved word 'if' as identifier drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Trying to use reserved word 'do' as identifier drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ; at end of declaration drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: got { drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Trying to use reserved word 'if' as identifier drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ; at end of declaration drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: got break drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ; at the end of type declaration drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: got } drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ; at end of declaration drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: got -> drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ; at the end of type declaration drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: got } drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ) in function declarator drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: got & drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Trying to use reserved word 'do' as identifier drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ; at end of declaration drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: got { drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ) in function declarator drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: got ( drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Trying to use reserved word 'if' as identifier drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ) in nested declarator drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: got { drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ) in function declarator drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: got ( drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Trying to use reserved word 'if' as identifier drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ) in function declarator drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: got "drivers/gpio/gpiolib-cdev.c" drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Trying to use reserved word 'do' as identifier drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ; at end of declaration drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: got { drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ; at the end of type declaration drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: got } drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ) in function declarator drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: got ! drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ; at the end of type declaration drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: got } drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ; at the end of type declaration drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: got } drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ; at the end of type declaration drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: got } drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ) in nested declarator drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: got task_struct drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ) in function declarator drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: got 1037 drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ; at end of declaration drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: got 1016 drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ; at end of declaration drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: got 1019 drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ; at end of declaration drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: got 1037 drivers/gpio/gpiolib-cdev.c:483:31: sparse: sparse: Expected ; at end of declaration # https://github.com/0day-ci/linux/commit/402a73d41d7b2b3a72dc346e62d2b4c44... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Andy-Shevchenko/gpiolib-Fix-line-event-handling-in-syscall-compatible-mode/20200910-182240 git checkout 402a73d41d7b2b3a72dc346e62d2b4c4403a6277 vim +432 drivers/gpio/gpiolib-cdev.c 425 426 static ssize_t lineevent_to_user(char __user *buf, struct gpioevent_data *ge) 427 { 428 #ifdef __x86_64__ 429 /* i386 has no padding after 'id' */ 430 if (in_ia32_syscall()) { 431 struct compat_ge { 433 u32 id; 434 } cge; 435 436 if (buf && ge) { 437 cge = (struct compat_ge){ ge->timestamp, ge->id }; 438 if (copy_to_user(buf, &cge, sizeof(cge))) 439 return -EFAULT; 440 } 441 442 return sizeof(cge); 443 } 444 #endif 445 447 if (copy_to_user(buf, ge, sizeof(*ge))) 448 return -EFAULT; 449 } 450 451 return sizeof(*ge); 452 } 453 454 static ssize_t lineevent_read(struct file *file, 455 char __user *buf, 456 size_t count, 457 loff_t *f_ps) 458 { 459 struct lineevent_state *le = file->private_data; 460 struct gpioevent_data ge; 461 ssize_t bytes_read = 0; 462 ssize_t ge_size; 463 int ret; 464 465 /* When argument is NULL it returns size of the structure in user space */ 466 ge_size = lineevent_to_user(NULL, NULL); 467 if (count < ge_size) 468 return -EINVAL; 469 471 spin_lock(&le->wait.lock); 472 if (kfifo_is_empty(&le->events)) { 473 if (bytes_read) { 474 spin_unlock(&le->wait.lock); 476 } 477 478 if (file->f_flags & O_NONBLOCK) { 479 spin_unlock(&le->wait.lock); 480 return -EAGAIN; 481 } 482 484 !kfifo_is_empty(&le->events)); 485 if (ret) { 486 spin_unlock(&le->wait.lock); 487 return ret; 488 } 489 } 490 491 ret = kfifo_out(&le->events, &ge, 1); 492 spin_unlock(&le->wait.lock); 493 if (ret != 1) { 494 /* 495 * This should never happen - we were holding the lock 496 * from the moment we learned the fifo is no longer 497 * empty until now. 498 */ 499 ret = -EIO; 500 break; 501 } 502 503 ret = lineevent_to_user(buf + bytes_read, &ge); 504 if (ret < 0) 505 return ret; 506 bytes_read += ret; 507 } while (count >= bytes_read + ge_size); 508 509 return bytes_read; 510 } 511 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org