Hi Mike, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on next-20211007] [cannot apply to mst-vhost/linux-next vgupta-arc/for-next arm64/for-next/core uclinux-h8/h8300-next geert-m68k/for-next openrisc/for-next deller-parisc/for-next powerpc/next s390/features linus/master v5.15-rc4 v5.15-rc3 v5.15-rc2 v5.15-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/Mike-Christie/Use-copy_process-create_io_thread-in-vhost-layer/20211008-093610 base: f8dc23b3dc0cc5b32dfd0c446e59377736d073a7 config: arc-randconfig-r043-20211007 (attached as .config) compiler: arc-elf-gcc (GCC) 11.2.0 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 # https://github.com/0day-ci/linux/commit/19238ec927cb55bbd6fd6bdf64bac6a99f457b8c git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Mike-Christie/Use-copy_process-create_io_thread-in-vhost-layer/20211008-093610 git checkout 19238ec927cb55bbd6fd6bdf64bac6a99f457b8c # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=arc 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/fork.c:161:13: warning: no previous prototype for 'arch_release_task_struct' [-Wmissing-prototypes] 161 | void __weak arch_release_task_struct(struct task_struct *tsk) | ^~~~~~~~~~~~~~~~~~~~~~~~ kernel/fork.c:814:20: warning: no previous prototype for 'arch_task_cache_init' [-Wmissing-prototypes] 814 | void __init __weak arch_task_cache_init(void) { } | ^~~~~~~~~~~~~~~~~~~~ kernel/fork.c:909:12: warning: no previous prototype for 'arch_dup_task_struct' [-Wmissing-prototypes] 909 | int __weak arch_dup_task_struct(struct task_struct *dst, | ^~~~~~~~~~~~~~~~~~~~ >> kernel/fork.c:2581:21: warning: no previous prototype for 'create_io_thread' [-Wmissing-prototypes] 2581 | struct task_struct *create_io_thread(int (*fn)(void *), void *arg, int node) | ^~~~~~~~~~~~~~~~ In file included from include/linux/perf_event.h:25, from include/linux/trace_events.h:10, from include/trace/syscall.h:7, from include/linux/syscalls.h:87, from kernel/fork.c:54: arch/arc/include/asm/perf_event.h:126:27: warning: 'arc_pmu_cache_map' defined but not used [-Wunused-const-variable=] 126 | static const unsigned int arc_pmu_cache_map[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = { | ^~~~~~~~~~~~~~~~~ arch/arc/include/asm/perf_event.h:91:27: warning: 'arc_pmu_ev_hw_map' defined but not used [-Wunused-const-variable=] 91 | static const char * const arc_pmu_ev_hw_map[] = { | ^~~~~~~~~~~~~~~~~ vim +/create_io_thread +2581 kernel/fork.c 13585fa0668c72 Nadav Amit 2019-04-25 2574 cc440e8738e5c8 Jens Axboe 2021-03-04 2575 /* cc440e8738e5c8 Jens Axboe 2021-03-04 2576 * This is like kernel_clone(), but shaved down and tailored to just cc440e8738e5c8 Jens Axboe 2021-03-04 2577 * creating io_uring workers. It returns a created task, or an error pointer. cc440e8738e5c8 Jens Axboe 2021-03-04 2578 * The returned task is inactive, and the caller must fire it up through cc440e8738e5c8 Jens Axboe 2021-03-04 2579 * wake_up_new_task(p). All signals are blocked in the created task. cc440e8738e5c8 Jens Axboe 2021-03-04 2580 */ cc440e8738e5c8 Jens Axboe 2021-03-04 @2581 struct task_struct *create_io_thread(int (*fn)(void *), void *arg, int node) cc440e8738e5c8 Jens Axboe 2021-03-04 2582 { cc440e8738e5c8 Jens Axboe 2021-03-04 2583 unsigned long flags = CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD| cc440e8738e5c8 Jens Axboe 2021-03-04 2584 CLONE_IO; cc440e8738e5c8 Jens Axboe 2021-03-04 2585 struct kernel_clone_args args = { cc440e8738e5c8 Jens Axboe 2021-03-04 2586 .flags = ((lower_32_bits(flags) | CLONE_VM | cc440e8738e5c8 Jens Axboe 2021-03-04 2587 CLONE_UNTRACED) & ~CSIGNAL), cc440e8738e5c8 Jens Axboe 2021-03-04 2588 .exit_signal = (lower_32_bits(flags) & CSIGNAL), cc440e8738e5c8 Jens Axboe 2021-03-04 2589 .stack = (unsigned long)fn, cc440e8738e5c8 Jens Axboe 2021-03-04 2590 .stack_size = (unsigned long)arg, 3f1f508b402889 Mike Christie 2021-10-07 2591 .worker_flags = KERN_WORKER_IO | KERN_WORKER_USER, cc440e8738e5c8 Jens Axboe 2021-03-04 2592 }; cc440e8738e5c8 Jens Axboe 2021-03-04 2593 b16b3855d89fba Jens Axboe 2021-03-26 2594 return copy_process(NULL, 0, node, &args); cc440e8738e5c8 Jens Axboe 2021-03-04 2595 } cc440e8738e5c8 Jens Axboe 2021-03-04 2596 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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