tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git pending-fixes head: b9bb7c062cc95f0fb891ebf697a54d0ebead7038 commit: 803c1aadecdb5d2f4cf86c029607e5c68f63e794 [228/518] virt: acrn: Use vfs_poll() instead of f_op->poll() config: x86_64-randconfig-s022-20210310 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-262-g5e674421-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next pending-fixes git checkout 803c1aadecdb5d2f4cf86c029607e5c68f63e794 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 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 >>)" vim +163 drivers/virt/acrn/irqfd.c aa3b483ff1d71c Shuo Liu 2021-02-07 105 aa3b483ff1d71c Shuo Liu 2021-02-07 106 /* aa3b483ff1d71c Shuo Liu 2021-02-07 107 * Assign an eventfd to a VM and create a HSM irqfd associated with the aa3b483ff1d71c Shuo Liu 2021-02-07 108 * eventfd. The properties of the HSM irqfd are built from a &struct aa3b483ff1d71c Shuo Liu 2021-02-07 109 * acrn_irqfd. aa3b483ff1d71c Shuo Liu 2021-02-07 110 */ aa3b483ff1d71c Shuo Liu 2021-02-07 111 static int acrn_irqfd_assign(struct acrn_vm *vm, struct acrn_irqfd *args) aa3b483ff1d71c Shuo Liu 2021-02-07 112 { aa3b483ff1d71c Shuo Liu 2021-02-07 113 struct eventfd_ctx *eventfd = NULL; aa3b483ff1d71c Shuo Liu 2021-02-07 114 struct hsm_irqfd *irqfd, *tmp; 803c1aadecdb5d Yejune Deng 2021-02-21 115 __poll_t events; aa3b483ff1d71c Shuo Liu 2021-02-07 116 struct fd f; aa3b483ff1d71c Shuo Liu 2021-02-07 117 int ret = 0; aa3b483ff1d71c Shuo Liu 2021-02-07 118 aa3b483ff1d71c Shuo Liu 2021-02-07 119 irqfd = kzalloc(sizeof(*irqfd), GFP_KERNEL); aa3b483ff1d71c Shuo Liu 2021-02-07 120 if (!irqfd) aa3b483ff1d71c Shuo Liu 2021-02-07 121 return -ENOMEM; aa3b483ff1d71c Shuo Liu 2021-02-07 122 aa3b483ff1d71c Shuo Liu 2021-02-07 123 irqfd->vm = vm; aa3b483ff1d71c Shuo Liu 2021-02-07 124 memcpy(&irqfd->msi, &args->msi, sizeof(args->msi)); aa3b483ff1d71c Shuo Liu 2021-02-07 125 INIT_LIST_HEAD(&irqfd->list); aa3b483ff1d71c Shuo Liu 2021-02-07 126 INIT_WORK(&irqfd->shutdown, hsm_irqfd_shutdown_work); aa3b483ff1d71c Shuo Liu 2021-02-07 127 aa3b483ff1d71c Shuo Liu 2021-02-07 128 f = fdget(args->fd); aa3b483ff1d71c Shuo Liu 2021-02-07 129 if (!f.file) { aa3b483ff1d71c Shuo Liu 2021-02-07 130 ret = -EBADF; aa3b483ff1d71c Shuo Liu 2021-02-07 131 goto out; aa3b483ff1d71c Shuo Liu 2021-02-07 132 } aa3b483ff1d71c Shuo Liu 2021-02-07 133 aa3b483ff1d71c Shuo Liu 2021-02-07 134 eventfd = eventfd_ctx_fileget(f.file); aa3b483ff1d71c Shuo Liu 2021-02-07 135 if (IS_ERR(eventfd)) { aa3b483ff1d71c Shuo Liu 2021-02-07 136 ret = PTR_ERR(eventfd); aa3b483ff1d71c Shuo Liu 2021-02-07 137 goto fail; aa3b483ff1d71c Shuo Liu 2021-02-07 138 } aa3b483ff1d71c Shuo Liu 2021-02-07 139 aa3b483ff1d71c Shuo Liu 2021-02-07 140 irqfd->eventfd = eventfd; aa3b483ff1d71c Shuo Liu 2021-02-07 141 aa3b483ff1d71c Shuo Liu 2021-02-07 142 /* aa3b483ff1d71c Shuo Liu 2021-02-07 143 * Install custom wake-up handling to be notified whenever underlying aa3b483ff1d71c Shuo Liu 2021-02-07 144 * eventfd is signaled. aa3b483ff1d71c Shuo Liu 2021-02-07 145 */ aa3b483ff1d71c Shuo Liu 2021-02-07 146 init_waitqueue_func_entry(&irqfd->wait, hsm_irqfd_wakeup); aa3b483ff1d71c Shuo Liu 2021-02-07 147 init_poll_funcptr(&irqfd->pt, hsm_irqfd_poll_func); aa3b483ff1d71c Shuo Liu 2021-02-07 148 aa3b483ff1d71c Shuo Liu 2021-02-07 149 mutex_lock(&vm->irqfds_lock); aa3b483ff1d71c Shuo Liu 2021-02-07 150 list_for_each_entry(tmp, &vm->irqfds, list) { aa3b483ff1d71c Shuo Liu 2021-02-07 151 if (irqfd->eventfd != tmp->eventfd) aa3b483ff1d71c Shuo Liu 2021-02-07 152 continue; aa3b483ff1d71c Shuo Liu 2021-02-07 153 ret = -EBUSY; aa3b483ff1d71c Shuo Liu 2021-02-07 154 mutex_unlock(&vm->irqfds_lock); aa3b483ff1d71c Shuo Liu 2021-02-07 155 goto fail; aa3b483ff1d71c Shuo Liu 2021-02-07 156 } aa3b483ff1d71c Shuo Liu 2021-02-07 157 list_add_tail(&irqfd->list, &vm->irqfds); aa3b483ff1d71c Shuo Liu 2021-02-07 158 mutex_unlock(&vm->irqfds_lock); aa3b483ff1d71c Shuo Liu 2021-02-07 159 aa3b483ff1d71c Shuo Liu 2021-02-07 160 /* Check the pending event in this stage */ 803c1aadecdb5d Yejune Deng 2021-02-21 161 events = vfs_poll(f.file, &irqfd->pt); aa3b483ff1d71c Shuo Liu 2021-02-07 162 aa3b483ff1d71c Shuo Liu 2021-02-07 @163 if (events & POLLIN) aa3b483ff1d71c Shuo Liu 2021-02-07 164 acrn_irqfd_inject(irqfd); aa3b483ff1d71c Shuo Liu 2021-02-07 165 aa3b483ff1d71c Shuo Liu 2021-02-07 166 fdput(f); aa3b483ff1d71c Shuo Liu 2021-02-07 167 return 0; aa3b483ff1d71c Shuo Liu 2021-02-07 168 fail: aa3b483ff1d71c Shuo Liu 2021-02-07 169 if (eventfd && !IS_ERR(eventfd)) aa3b483ff1d71c Shuo Liu 2021-02-07 170 eventfd_ctx_put(eventfd); aa3b483ff1d71c Shuo Liu 2021-02-07 171 aa3b483ff1d71c Shuo Liu 2021-02-07 172 fdput(f); aa3b483ff1d71c Shuo Liu 2021-02-07 173 out: aa3b483ff1d71c Shuo Liu 2021-02-07 174 kfree(irqfd); aa3b483ff1d71c Shuo Liu 2021-02-07 175 return ret; aa3b483ff1d71c Shuo Liu 2021-02-07 176 } aa3b483ff1d71c Shuo Liu 2021-02-07 177 :::::: The code at line 163 was first introduced by commit :::::: aa3b483ff1d71c50b33db154048dff9a8f08ac71 virt: acrn: Introduce irqfd :::::: TO: Shuo Liu <shuo.a.liu(a)intel.com&gt; :::::: CC: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org