Re: [PATCH net 4/4] vhost: log dirty page correctly

kbuild test robot
2018-12-10T15:14:41Z

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Hi Jason,

I love your patch! Perhaps something to improve:

[auto build test WARNING on net/master]

url: https://github.com/0day-ci/linux/commits/Jason-Wang/Fix-various-issue-of-vhost/20181210-223236
config: i386-randconfig-x072-201849 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
# save the attached .config to linux build tree
make ARCH=i386

All warnings (new ones prefixed by >>):

drivers//vhost/vhost.c: In function 'log_used':
>> drivers//vhost/vhost.c:1771:27: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
ret = translate_desc(vq, (u64)vq->used + used_offset, len, iov, 64,
^
drivers//vhost/vhost.c:1776:27: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
ret = log_write_hva(vq, (u64)iov[i].iov_base, iov[i].iov_len);
^
drivers//vhost/vhost.c: In function 'vhost_log_write':
drivers//vhost/vhost.c:1788:26: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
r = log_write_hva(vq, (u64)iov[i].iov_base,
^
Cyclomatic Complexity 5 include/linux/compiler.h:__read_once_size
Cyclomatic Complexity 5 include/linux/compiler.h:__write_once_size
Cyclomatic Complexity 1 arch/x86/include/asm/barrier.h:array_index_mask_nospec
Cyclomatic Complexity 1 include/linux/kasan-checks.h:kasan_check_read
Cyclomatic Complexity 1 include/linux/kasan-checks.h:kasan_check_write
Cyclomatic Complexity 2 arch/x86/include/asm/bitops.h:set_bit
Cyclomatic Complexity 2 arch/x86/include/asm/bitops.h:clear_bit
Cyclomatic Complexity 1 arch/x86/include/asm/bitops.h:test_and_set_bit
Cyclomatic Complexity 1 arch/x86/include/asm/bitops.h:constant_test_bit
Cyclomatic Complexity 1 arch/x86/include/asm/bitops.h:variable_test_bit
Cyclomatic Complexity 1 arch/x86/include/asm/bitops.h:fls
Cyclomatic Complexity 1 include/linux/log2.h:__ilog2_u32
Cyclomatic Complexity 1 include/linux/list.h:INIT_LIST_HEAD
Cyclomatic Complexity 1 include/linux/list.h:__list_del
Cyclomatic Complexity 1 include/linux/list.h:list_empty
Cyclomatic Complexity 1 arch/x86/include/asm/current.h:get_current
Cyclomatic Complexity 3 include/linux/string.h:memset
Cyclomatic Complexity 5 include/linux/string.h:memcpy
Cyclomatic Complexity 1 include/asm-generic/getorder.h:__get_order
Cyclomatic Complexity 1 arch/x86/include/asm/atomic.h:arch_atomic_dec_and_test
Cyclomatic Complexity 1 include/asm-generic/atomic-instrumented.h:atomic_dec_and_test
Cyclomatic Complexity 1 include/linux/err.h:PTR_ERR
Cyclomatic Complexity 1 include/linux/thread_info.h:set_ti_thread_flag
Cyclomatic Complexity 1 include/linux/thread_info.h:check_object_size
Cyclomatic Complexity 5 include/linux/thread_info.h:check_copy_size
Cyclomatic Complexity 1 arch/x86/include/asm/preempt.h:preempt_count
Cyclomatic Complexity 1 include/linux/spinlock.h:spinlock_check
Cyclomatic Complexity 1 include/linux/spinlock.h:spin_lock
Cyclomatic Complexity 1 include/linux/spinlock.h:spin_unlock
Cyclomatic Complexity 1 include/linux/wait.h:init_waitqueue_func_entry
Cyclomatic Complexity 1 include/linux/llist.h:init_llist_head
Cyclomatic Complexity 1 include/linux/llist.h:llist_empty
Cyclomatic Complexity 1 include/linux/llist.h:llist_del_all
Cyclomatic Complexity 1 include/linux/rbtree.h:rb_link_node
Cyclomatic Complexity 3 include/linux/overflow.h:__ab_c_size
Cyclomatic Complexity 1 include/linux/page_ref.h:page_ref_dec_and_test
Cyclomatic Complexity 1 include/linux/sched.h:task_thread_info
Cyclomatic Complexity 1 include/linux/sched.h:need_resched
Cyclomatic Complexity 1 include/linux/mm.h:put_page_testzero
Cyclomatic Complexity 1 include/linux/mm.h:put_devmap_managed_page
Cyclomatic Complexity 1 include/uapi/linux/virtio_ring.h:vring_need_event
Cyclomatic Complexity 1 include/linux/virtio_byteorder.h:virtio_legacy_is_little_endian
Cyclomatic Complexity 2 include/linux/uio.h:copy_to_iter
Cyclomatic Complexity 2 include/linux/uio.h:copy_from_iter
Cyclomatic Complexity 2 include/linux/uio.h:copy_from_iter_full
Cyclomatic Complexity 1 include/linux/uio.h:iov_iter_count
Cyclomatic Complexity 1 include/linux/slab.h:kmalloc_type
Cyclomatic Complexity 28 include/linux/slab.h:kmalloc_index
Cyclomatic Complexity 67 include/linux/slab.h:kmalloc_large
Cyclomatic Complexity 4 include/linux/slab.h:kmalloc
Cyclomatic Complexity 1 arch/x86/include/asm/smap.h:clac
Cyclomatic Complexity 1 arch/x86/include/asm/smap.h:stac
Cyclomatic Complexity 1 arch/x86/include/asm/uaccess.h:set_fs
Cyclomatic Complexity 1 arch/x86/include/asm/uaccess_32.h:raw_copy_to_user
Cyclomatic Complexity 5 arch/x86/include/asm/uaccess_32.h:raw_copy_from_user
Cyclomatic Complexity 1 include/linux/uaccess.h:__copy_from_user
Cyclomatic Complexity 1 include/linux/uaccess.h:__copy_to_user
Cyclomatic Complexity 2 include/linux/uaccess.h:copy_from_user
Cyclomatic Complexity 2 include/linux/uaccess.h:copy_to_user
Cyclomatic Complexity 4 include/linux/poll.h:poll_wait
Cyclomatic Complexity 1 include/linux/poll.h:init_poll_funcptr
Cyclomatic Complexity 1 include/linux/rbtree_augmented.h:rb_set_parent
Cyclomatic Complexity 1 include/linux/rbtree_augmented.h:rb_set_parent_color
Cyclomatic Complexity 3 include/linux/rbtree_augmented.h:__rb_change_child
Cyclomatic Complexity 11 include/linux/rbtree_augmented.h:__rb_erase_augmented
Cyclomatic Complexity 2 include/linux/rbtree_augmented.h:rb_erase_augmented_cached
Cyclomatic Complexity 1 drivers//vhost/vhost.h:vhost_has_feature
Cyclomatic Complexity 1 drivers//vhost/vhost.h:vhost_backend_has_feature
Cyclomatic Complexity 1 drivers//vhost/vhost.h:vhost_is_little_endian
Cyclomatic Complexity 5 drivers//vhost/vhost.c:vhost_umem_interval_tree_compute_subtree_last
Cyclomatic Complexity 3 drivers//vhost/vhost.c:vhost_umem_interval_tree_augment_propagate
Cyclomatic Complexity 1 drivers//vhost/vhost.c:vhost_umem_interval_tree_augment_copy
Cyclomatic Complexity 1 drivers//vhost/vhost.c:vhost_umem_interval_tree_augment_rotate
Cyclomatic Complexity 1 drivers//vhost/vhost.c:vhost_umem_interval_tree_remove
Cyclomatic Complexity 7 drivers//vhost/vhost.c:vhost_umem_interval_tree_subtree_search
Cyclomatic Complexity 4 drivers//vhost/vhost.c:vhost_umem_interval_tree_iter_first
Cyclomatic Complexity 1 drivers//vhost/vhost.c:vhost_disable_cross_endian
Cyclomatic Complexity 1 drivers//vhost/vhost.c:vhost_enable_cross_endian_big
Cyclomatic Complexity 1 drivers//vhost/vhost.c:vhost_enable_cross_endian_little
Cyclomatic Complexity 5 drivers//vhost/vhost.c:vhost_set_vring_endian
Cyclomatic Complexity 2 drivers//vhost/vhost.c:vhost_get_vring_endian
Cyclomatic Complexity 3 drivers//vhost/vhost.c:vhost_init_is_le
Cyclomatic Complexity 1 drivers//vhost/vhost.c:vhost_reset_is_le
Cyclomatic Complexity 1 drivers//vhost/vhost.c:vhost_work_init
Cyclomatic Complexity 1 drivers//vhost/vhost.c:vhost_poll_init
Cyclomatic Complexity 1 drivers//vhost/vhost.c:vhost_has_work
Cyclomatic Complexity 2 drivers//vhost/vhost.c:__vhost_vq_meta_reset
Cyclomatic Complexity 2 drivers//vhost/vhost.c:vhost_vq_meta_reset
Cyclomatic Complexity 1 drivers//vhost/vhost.c:vhost_vq_reset
Cyclomatic Complexity 2 drivers//vhost/vhost.c:vhost_dev_check_owner
Cyclomatic Complexity 1 drivers//vhost/vhost.c:vhost_dev_has_owner

vim +1771 drivers//vhost/vhost.c

1760
1761 static void log_used(struct vhost_virtqueue *vq, u64 used_offset, u64 len)
1762 {
1763 struct iovec iov[64];
1764 int i, ret;
1765
1766 if (!vq->iotlb) {
1767 log_write(vq->log_base, vq->log_addr + used_offset, len);
1768 return;
1769 }
1770
> 1771 ret = translate_desc(vq, (u64)vq->used + used_offset, len, iov, 64,
1772 VHOST_ACCESS_WO);
1773 WARN_ON(ret < 0);
1774
1775 for (i = 0; i < ret; i++) {
1776 ret = log_write_hva(vq, (u64)iov[i].iov_base, iov[i].iov_len);
1777 WARN_ON(ret);
1778 }
1779 }
1780

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