linux-kernel - linux-next: build failure after merge of the block tree

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Date:   Mon, 3 Feb 2020 11:04:26 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: linux-next: build failure after merge of the block tree

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

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