Hi all,

After merging the rcu tree, today's linux-next build (x86_64 allmodconfig)
failed like this:

In file included from include/linux/kernel.h:15,
                 from kernel/rcu/rcuscale.c:13:
kernel/rcu/rcuscale.c: In function 'rcu_scale_writer':
kernel/rcu/rcuscale.c:430:6: error: 'perf_type' undeclared (first use in this function); did you mean 'kernfs_type'?
  430 |      perf_type, PERF_FLAG, me, MIN_MEAS);
      |      ^~~~~~~~~
include/linux/printk.h:319:35: note: in definition of macro 'pr_alert'
  319 |  printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
      |                                   ^~~~~~~~~~~
kernel/rcu/rcuscale.c:430:6: note: each undeclared identifier is reported only once for each function it appears in
  430 |      perf_type, PERF_FLAG, me, MIN_MEAS);
      |      ^~~~~~~~~
include/linux/printk.h:319:35: note: in definition of macro 'pr_alert'
  319 |  printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
      |                                   ^~~~~~~~~~~
kernel/rcu/rcuscale.c:430:17: error: 'PERF_FLAG' undeclared (first use in this function)
  430 |      perf_type, PERF_FLAG, me, MIN_MEAS);
      |                 ^~~~~~~~~
include/linux/printk.h:319:35: note: in definition of macro 'pr_alert'
  319 |  printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
      |                                   ^~~~~~~~~~~
kernel/rcu/rcuscale.c:431:27: error: 'n_rcu_perf_writer_finished' undeclared (first use in this function); did you mean 'n_rcu_scale_writer_finished'?
  431 |    if (atomic_inc_return(&n_rcu_perf_writer_finished) >=
      |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~
      |                           n_rcu_scale_writer_finished

Caused by commit

  a20b5bd09813 ("rcuperf: Change rcuperf to rcuscale")

I have used the rcu tree from next-20200817 for today.

-- 
Cheers,
Stephen Rothwell