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SubjectRe: [PATCH v2] eventfd: convert global percpu eventfd_wake_count to ctx percpu eventfd_wake_count
Hi,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.13-rc5 next-20210609]
[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/qiang-zhang-windriver-com/eventfd-convert-global-percpu-eventfd_wake_count-to-ctx-percpu-eventfd_wake_count/20210609-112354
base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 368094df48e680fa51cedb68537408cfa64b788e
config: x86_64-randconfig-a015-20210608 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project d2012d965d60c3258b3a69d024491698f8aec386)
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 x86_64 cross compiling tool for clang build
# apt-get install binutils-x86-64-linux-gnu
# https://github.com/0day-ci/linux/commit/e11cefc5baf3f6cfb1ec8cd99b80422b6f592517
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review qiang-zhang-windriver-com/eventfd-convert-global-percpu-eventfd_wake_count-to-ctx-percpu-eventfd_wake_count/20210609-112354
git checkout e11cefc5baf3f6cfb1ec8cd99b80422b6f592517
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

In file included from drivers/vhost/net.c:9:
>> include/linux/eventfd.h:37:14: error: field has incomplete type 'struct kref'
struct kref kref;
^
include/linux/eventfd.h:37:9: note: forward declaration of 'struct kref'
struct kref kref;
^
1 error generated.


vim +37 include/linux/eventfd.h

35
36 struct eventfd_ctx {
> 37 struct kref kref;
38 wait_queue_head_t wqh;
39 /*
40 * Every time that a write(2) is performed on an eventfd, the
41 * value of the __u64 being written is added to "count" and a
42 * wakeup is performed on "wqh". A read(2) will return the "count"
43 * value to userspace, and will reset "count" to zero. The kernel
44 * side eventfd_signal() also, adds to the "count" counter and
45 * issue a wakeup.
46 */
47 __u64 count;
48 unsigned int flags;
49 int id;
50 int __percpu *eventfd_wake_count;
51 };
52

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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