Hi all,

After merging the block tree, today's linux-next build (powerpc
ppc64_defconfig) failed like this:

In file included from drivers/vhost/vhost.c:13:
include/linux/eventfd.h:43:22: error: unknown type name 'eventfd_wake_count'
   43 | DECLARE_PER_CPU(int, eventfd_wake_count);
      |                      ^~~~~~~~~~~~~~~~~~
include/linux/eventfd.h: In function 'eventfd_signal_count':
include/linux/eventfd.h:47:9: error: implicit declaration of function 'this_cpu_read' [-Werror=implicit-function-declaration]
   47 |  return this_cpu_read(eventfd_wake_count);
      |         ^~~~~~~~~~~~~
include/linux/eventfd.h:47:23: error: 'eventfd_wake_count' undeclared (first use in this function); did you mean 'eventfd_signal_count'?
   47 |  return this_cpu_read(eventfd_wake_count);
      |                       ^~~~~~~~~~~~~~~~~~
      |                       eventfd_signal_count
include/linux/eventfd.h:47:23: note: each undeclared identifier is reported only once for each function it appears in

Caused by commit

  9a9f718763cf ("eventfd: track eventfd_signal() recursion depth")

I have used the block tree from next-20200131 for today.

-- 
Cheers,
Stephen Rothwell