Re: [PATCH v2] eventfd: convert global percpu eventfd_wake_count to ctx percpu eventfd_wake_count

From: kernel test robot
Date: Wed Jun 09 2021 - 02:56:42 EST


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-20210608]
[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]

base: 368094df48e680fa51cedb68537408cfa64b788e
config: riscv-randconfig-s031-20210608 (attached as .config)
compiler: riscv32-linux-gcc (GCC) 9.3.0
wget -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.3-341-g8af24329-dirty
git remote add linux-review
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=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=riscv

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 drivers/vhost/net.c:9:
>> include/linux/eventfd.h:37:14: error: field 'kref' has incomplete type
37 | struct kref kref;
| ^~~~

Kconfig warnings: (for reference only)
WARNING: unmet direct dependencies detected for ERRATA_SIFIVE
Selected by

vim +/kref +37 include/linux/eventfd.h

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 };

0-DAY CI Kernel Test Service, Intel Corporation

Attachment: .config.gz
Description: application/gzip