Hi David, I love your patch! Yet something to improve: [auto build test ERROR on vfio/next] [also build test ERROR on vhost/linux-next linus/master kvm/linux-next v5.10-rc1 next-20201027] [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/David-Woodhouse/Allow-in-kernel-consumers-to-drain-events-from-eventfd/20201027-215658 base: https://github.com/awilliam/linux-vfio.git next config: s390-randconfig-r023-20201027 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project f2c25c70791de95d2466e09b5b58fc37f6ccd7a4) 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 s390 cross compiling tool for clang build # apt-get install binutils-s390x-linux-gnu # https://github.com/0day-ci/linux/commit/dc45dd9af28fede8f8dd29b705b90f78cf87538c git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review David-Woodhouse/Allow-in-kernel-consumers-to-drain-events-from-eventfd/20201027-215658 git checkout dc45dd9af28fede8f8dd29b705b90f78cf87538c # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=s390 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): In file included from arch/s390/include/asm/kvm_para.h:25: In file included from arch/s390/include/asm/diag.h:12: In file included from include/linux/if_ether.h:19: In file included from include/linux/skbuff.h:31: In file included from include/linux/dma-mapping.h:11: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:72: include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) ^ include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32' ___constant_swab32(x) : \ ^ include/uapi/linux/swab.h:21:12: note: expanded from macro '___constant_swab32' (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ ^ In file included from arch/s390/kvm/../../../virt/kvm/eventfd.c:12: In file included from include/linux/kvm_host.h:32: In file included from include/linux/kvm_para.h:5: In file included from include/uapi/linux/kvm_para.h:36: In file included from arch/s390/include/asm/kvm_para.h:25: In file included from arch/s390/include/asm/diag.h:12: In file included from include/linux/if_ether.h:19: In file included from include/linux/skbuff.h:31: In file included from include/linux/dma-mapping.h:11: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:72: include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) ^ include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32' ___constant_swab32(x) : \ ^ include/uapi/linux/swab.h:22:12: note: expanded from macro '___constant_swab32' (((__u32)(x) & (__u32)0xff000000UL) >> 24))) ^ In file included from arch/s390/kvm/../../../virt/kvm/eventfd.c:12: In file included from include/linux/kvm_host.h:32: In file included from include/linux/kvm_para.h:5: In file included from include/uapi/linux/kvm_para.h:36: In file included from arch/s390/include/asm/kvm_para.h:25: In file included from arch/s390/include/asm/diag.h:12: In file included from include/linux/if_ether.h:19: In file included from include/linux/skbuff.h:31: In file included from include/linux/dma-mapping.h:11: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:72: include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) ^ include/uapi/linux/swab.h:120:12: note: expanded from macro '__swab32' __fswab32(x)) ^ In file included from arch/s390/kvm/../../../virt/kvm/eventfd.c:12: In file included from include/linux/kvm_host.h:32: In file included from include/linux/kvm_para.h:5: In file included from include/uapi/linux/kvm_para.h:36: In file included from arch/s390/include/asm/kvm_para.h:25: In file included from arch/s390/include/asm/diag.h:12: In file included from include/linux/if_ether.h:19: In file included from include/linux/skbuff.h:31: In file included from include/linux/dma-mapping.h:11: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:72: include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writeb(value, PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsb(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsw(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsl(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesb(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesw(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesl(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ >> arch/s390/kvm/../../../virt/kvm/eventfd.c:197:23: error: incompatible pointer types passing 'struct eventfd_ctx **' to parameter of type 'struct eventfd_ctx *'; remove & [-Werror,-Wincompatible-pointer-types] eventfd_ctx_do_read(&irqfd->eventfd, &cnt); ^~~~~~~~~~~~~~~ include/linux/eventfd.h:44:46: note: passing argument to parameter 'ctx' here void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt); ^ 20 warnings and 1 error generated. vim +197 arch/s390/kvm/../../../virt/kvm/eventfd.c 180 181 /* 182 * Called with wqh->lock held and interrupts disabled 183 */ 184 static int 185 irqfd_wakeup(wait_queue_entry_t *wait, unsigned mode, int sync, void *key) 186 { 187 struct kvm_kernel_irqfd *irqfd = 188 container_of(wait, struct kvm_kernel_irqfd, wait); 189 __poll_t flags = key_to_poll(key); 190 struct kvm_kernel_irq_routing_entry irq; 191 struct kvm *kvm = irqfd->kvm; 192 unsigned seq; 193 int idx; 194 195 if (flags & EPOLLIN) { 196 u64 cnt; > 197 eventfd_ctx_do_read(&irqfd->eventfd, &cnt); 198 199 idx = srcu_read_lock(&kvm->irq_srcu); 200 do { 201 seq = read_seqcount_begin(&irqfd->irq_entry_sc); 202 irq = irqfd->irq_entry; 203 } while (read_seqcount_retry(&irqfd->irq_entry_sc, seq)); 204 /* An event has been signaled, inject an interrupt */ 205 if (kvm_arch_set_irq_inatomic(&irq, kvm, 206 KVM_USERSPACE_IRQ_SOURCE_ID, 1, 207 false) == -EWOULDBLOCK) 208 schedule_work(&irqfd->inject); 209 srcu_read_unlock(&kvm->irq_srcu, idx); 210 } 211 212 if (flags & EPOLLHUP) { 213 /* The eventfd is closing, detach from KVM */ 214 unsigned long iflags; 215 216 spin_lock_irqsave(&kvm->irqfds.lock, iflags); 217 218 /* 219 * We must check if someone deactivated the irqfd before 220 * we could acquire the irqfds.lock since the item is 221 * deactivated from the KVM side before it is unhooked from 222 * the wait-queue. If it is already deactivated, we can 223 * simply return knowing the other side will cleanup for us. 224 * We cannot race against the irqfd going away since the 225 * other side is required to acquire wqh->lock, which we hold 226 */ 227 if (irqfd_is_active(irqfd)) 228 irqfd_deactivate(irqfd); 229 230 spin_unlock_irqrestore(&kvm->irqfds.lock, iflags); 231 } 232 233 return 0; 234 } 235 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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