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

Paul E. McKenney
2020-08-18T14:08:26Z

On Tue, Aug 18, 2020 at 11:43:54AM +1000, Stephen Rothwell wrote:
> 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.

My test scripts clearly are not dealing gracefully with filename changes,
are they? :-/

Thank you for catching this one! I have queued a fix.

Thanx, Paul