Hi Johannes, kernel test robot noticed the following build errors:
[auto build test ERROR on linus/master] [also build test ERROR on v6.19-rc7] [cannot apply to mst-vhost/linux-next next-20260127] [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#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Johannes-Thumshirn/virtio-silence-KCSAN-warning-in-virtqueue_get_buf_ctx_split/20260127-235023 base: linus/master patch link: https://lore.kernel.org/r/20260127152524.200465-3-johannes.thumshirn%40wdc.com patch subject: [PATCH v2 2/2] virtio: silence KCSAN warning in virtqueue_kick_prepare config: hexagon-allmodconfig (https://download.01.org/0day-ci/archive/20260129/[email protected]/config) compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260129/[email protected]/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <[email protected]> | Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/ All errors (new ones prefixed by >>): >> drivers/vhost/vringh.c:559:19: error: cannot take the address of an rvalue >> of type '__virtio16' (aka 'unsigned short') 559 | if (putu16(vrh, &vring_avail_event(&vrh->vring), | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/vhost/vringh.c:562:8: error: cannot take the address of an rvalue of type '__virtio16' (aka 'unsigned short') 562 | &vring_avail_event(&vrh->vring)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2 errors generated. vim +559 drivers/vhost/vringh.c f87d0fbb579818 Rusty Russell 2013-03-20 542 f87d0fbb579818 Rusty Russell 2013-03-20 543 static inline bool __vringh_notify_enable(struct vringh *vrh, b9f7ac8c72894c Michael S. Tsirkin 2014-12-12 544 int (*getu16)(const struct vringh *vrh, b9f7ac8c72894c Michael S. Tsirkin 2014-12-12 545 u16 *val, const __virtio16 *p), b9f7ac8c72894c Michael S. Tsirkin 2014-12-12 546 int (*putu16)(const struct vringh *vrh, b9f7ac8c72894c Michael S. Tsirkin 2014-12-12 547 __virtio16 *p, u16 val)) f87d0fbb579818 Rusty Russell 2013-03-20 548 { f87d0fbb579818 Rusty Russell 2013-03-20 549 u16 avail; f87d0fbb579818 Rusty Russell 2013-03-20 550 f87d0fbb579818 Rusty Russell 2013-03-20 551 if (!vrh->event_indices) { f87d0fbb579818 Rusty Russell 2013-03-20 552 /* Old-school; update flags. */ b9f7ac8c72894c Michael S. Tsirkin 2014-12-12 553 if (putu16(vrh, &vrh->vring.used->flags, 0) != 0) { f87d0fbb579818 Rusty Russell 2013-03-20 554 vringh_bad("Clearing used flags %p", f87d0fbb579818 Rusty Russell 2013-03-20 555 &vrh->vring.used->flags); f87d0fbb579818 Rusty Russell 2013-03-20 556 return true; f87d0fbb579818 Rusty Russell 2013-03-20 557 } f87d0fbb579818 Rusty Russell 2013-03-20 558 } else { b9f7ac8c72894c Michael S. Tsirkin 2014-12-12 @559 if (putu16(vrh, &vring_avail_event(&vrh->vring), f87d0fbb579818 Rusty Russell 2013-03-20 560 vrh->last_avail_idx) != 0) { f87d0fbb579818 Rusty Russell 2013-03-20 561 vringh_bad("Updating avail event index %p", f87d0fbb579818 Rusty Russell 2013-03-20 562 &vring_avail_event(&vrh->vring)); f87d0fbb579818 Rusty Russell 2013-03-20 563 return true; f87d0fbb579818 Rusty Russell 2013-03-20 564 } f87d0fbb579818 Rusty Russell 2013-03-20 565 } f87d0fbb579818 Rusty Russell 2013-03-20 566 f87d0fbb579818 Rusty Russell 2013-03-20 567 /* They could have slipped one in as we were doing that: make f87d0fbb579818 Rusty Russell 2013-03-20 568 * sure it's written, then check again. */ f87d0fbb579818 Rusty Russell 2013-03-20 569 virtio_mb(vrh->weak_barriers); f87d0fbb579818 Rusty Russell 2013-03-20 570 b9f7ac8c72894c Michael S. Tsirkin 2014-12-12 571 if (getu16(vrh, &avail, &vrh->vring.avail->idx) != 0) { f87d0fbb579818 Rusty Russell 2013-03-20 572 vringh_bad("Failed to check avail idx at %p", f87d0fbb579818 Rusty Russell 2013-03-20 573 &vrh->vring.avail->idx); f87d0fbb579818 Rusty Russell 2013-03-20 574 return true; f87d0fbb579818 Rusty Russell 2013-03-20 575 } f87d0fbb579818 Rusty Russell 2013-03-20 576 f87d0fbb579818 Rusty Russell 2013-03-20 577 /* This is unlikely, so we just leave notifications enabled f87d0fbb579818 Rusty Russell 2013-03-20 578 * (if we're using event_indices, we'll only get one f87d0fbb579818 Rusty Russell 2013-03-20 579 * notification anyway). */ f87d0fbb579818 Rusty Russell 2013-03-20 580 return avail == vrh->last_avail_idx; f87d0fbb579818 Rusty Russell 2013-03-20 581 } f87d0fbb579818 Rusty Russell 2013-03-20 582 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
