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SubjectRe: [ANNOUNCE] 4.1.46-rt52
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Date
On 11/29/2017 05:13 PM, Julia Cartwright wrote:
> Hello RT Folks!
>
> I'm pleased to announce the 4.1.46-rt52 stable release.
>
> You can get this release via the git tree at:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-stable-rt.git
>
> branch: v4.1-rt
> Head SHA1: 6e737a91c1ce923d4e10db831e14cfef9a2459cc
>
> Or to build 4.1.46-rt52 directly, the following patches should be applied:
>
> http://www.kernel.org/pub/linux/kernel/v4.x/linux-4.1.tar.xz
>
> http://www.kernel.org/pub/linux/kernel/v4.x/patch-4.1.46.xz
>
> http://www.kernel.org/pub/linux/kernel/projects/rt/4.1/patch-4.1.46-rt52.patch.xz
>
>
> You can also build from 4.1.46-rt51 by applying the incremental patch:
>
> http://www.kernel.org/pub/linux/kernel/projects/rt/4.1/incr/patch-4.1.46-rt51-rt52.patch.xz
>
> Enjoy!
> Julia
>
> Changes from v4.1.46-rt51:
> ---
> Julia Cartwright (2):
> workqueue: fixup rcu check for RT
> Linux 4.1.46-rt52
>
> Sebastian Andrzej Siewior (2):
> PM / CPU: replace raw_notifier with atomic_notifier (fixup)

This change breaks the compile of 4.1 on ARM (and other things using
kernel/cpu_pm.c).

rcu_irq_enter_irqson() and friends doesn't exist in 4.1. In fact,
rcu_irq_enter() doesn't even exist.

Sorry I didn't get to testing this earlier, I've been focused on other things.

-corey


> kernel/hrtimer: migrate deferred timer on CPU down
>
> ---
> kernel/cpu_pm.c | 7 +++++++
> kernel/time/hrtimer.c | 5 +++++
> kernel/workqueue.c | 2 +-
> localversion-rt | 2 +-
> 4 files changed, 14 insertions(+), 2 deletions(-)
> ---
> diff --git a/kernel/cpu_pm.c b/kernel/cpu_pm.c
> index 9da42f83ee03..d1d1c3961553 100644
> --- a/kernel/cpu_pm.c
> +++ b/kernel/cpu_pm.c
> @@ -28,8 +28,15 @@ static int cpu_pm_notify(enum cpu_pm_event event, int nr_to_call, int *nr_calls)
> {
> int ret;
>
> + /*
> + * __atomic_notifier_call_chain has a RCU read critical section, which
> + * could be disfunctional in cpu idle. Copy RCU_NONIDLE code to let
> + * RCU know this.
> + */
> + rcu_irq_enter_irqson();
> ret = __atomic_notifier_call_chain(&cpu_pm_notifier_chain, event, NULL,
> nr_to_call, nr_calls);
> + rcu_irq_exit_irqson();
>
> return notifier_to_errno(ret);
> }
> diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
> index 2c6be169bdc7..75c990b00525 100644
> --- a/kernel/time/hrtimer.c
> +++ b/kernel/time/hrtimer.c
> @@ -1951,6 +1951,11 @@ static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
> /* Clear the migration state bit */
> timer->state &= ~HRTIMER_STATE_MIGRATE;
> }
> +#ifdef CONFIG_PREEMPT_RT_BASE
> + list_splice_tail(&old_base->expired, &new_base->expired);
> + if (!list_empty(&new_base->expired))
> + raise_softirq_irqoff(HRTIMER_SOFTIRQ);
> +#endif
> }
>
> static void migrate_hrtimers(int scpu)
> diff --git a/kernel/workqueue.c b/kernel/workqueue.c
> index 6bdcab98501c..90e261c8811e 100644
> --- a/kernel/workqueue.c
> +++ b/kernel/workqueue.c
> @@ -363,7 +363,7 @@ static void workqueue_sysfs_unregister(struct workqueue_struct *wq);
> "RCU or wq->mutex should be held")
>
> #define assert_rcu_or_wq_mutex_or_pool_mutex(wq) \
> - rcu_lockdep_assert(rcu_read_lock_sched_held() || \
> + rcu_lockdep_assert(rcu_read_lock_held() || \
> lockdep_is_held(&wq->mutex) || \
> lockdep_is_held(&wq_pool_mutex), \
> "sched RCU, wq->mutex or wq_pool_mutex should be held")
> diff --git a/localversion-rt b/localversion-rt
> index 75493460c41f..66a5ed8bf3d7 100644
> --- a/localversion-rt
> +++ b/localversion-rt
> @@ -1 +1 @@
> --rt51
> +-rt52
> --
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