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

From: Jens Axboe <[email-masked]>
Date: Sun, 2 Feb 2020 21:12:59 -0700

On 2/2/20 5:04 PM, Stephen Rothwell wrote:
> 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.

Doh, missed include, didn't fail on x86-64. Fixed it up, should work
tomorrow.

-- 
Jens Axboe