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

Davidlohr Bueso
2015-09-02T06:40:57Z

On Tue, 2015-09-01 at 22:26 -0700, Paul E. McKenney wrote:
> Davidlohr, the error is due to sched_setscheduler_nocheck() not being
> exported, so that Stephen gets this failure when building modules.
> This is 04be76a9b067 (locktorture: Support rtmutex torturing) in -rcu.
>
> Thoughts?

Right, the below should take care of it. Although I think it makes sense
to get this into at least 4.3 even if we won't use it until 4.4. Simply
because we already export sched_setscheduler(). If you agree I guess we
could route via -tip.

Thanks,
Davidlohr

----8<------------------------------------
Subject: [PATCH -next] sched: Export sched_setscheduler_nocheck

... just like regular sched_setscheduler(). We need this, for locktorture
otherwise we can fail to build modules, ie:

ERROR: "sched_setscheduler_nocheck" [kernel/locking/locktorture.ko] undefined!

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Ingo Molnar <mingo@kernel.org>
---
kernel/sched/core.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 3595403..7b51f64 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4012,6 +4012,7 @@ int sched_setscheduler_nocheck(struct task_struct *p, int policy,
{
return _sched_setscheduler(p, policy, param, false);
}
+EXPORT_SYMBOL_GPL(sched_setscheduler_nocheck);

static int
do_sched_setscheduler(pid_t pid, int policy, struct sched_param __user *param)
--
2.1.4