Dear RT Folks,
I'm pleased to announce the 5.4.82-rt46 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: v5.4-rt Head SHA1: 2cb0daa9d528e36f026b0c60e7eb881d2282462a Or to build 5.4.82-rt46 directly, the following patches should be applied: http://www.kernel.org/pub/linux/kernel/v5.x/linux-5.4.tar.xz http://www.kernel.org/pub/linux/kernel/v5.x/patch-5.4.82.xz http://www.kernel.org/pub/linux/kernel/projects/rt/5.4/patch-5.4.82-rt46.patch.xz You can also build from 5.4.82-rt45 by applying the incremental patch: http://www.kernel.org/pub/linux/kernel/projects/rt/5.4/incr/patch-5.4.82-rt45-rt46.patch.xz Enjoy, -- Steve Changes from v5.4.82-rt45: --- Sebastian Andrzej Siewior (1): Revert "hrtimer: Allow raw wakeups during boot" Steven Rostedt (VMware) (2): Revert "net: Properly annotate the try-lock for the seqlock" Linux 5.4.82-rt46 Thomas Gleixner (1): timers: Move clearing of base::timer_running under base::lock Zanxiong Qiu (1): mm/swap: use local lock in deactivate_page() ---- include/linux/seqlock.h | 9 +++++++++ include/net/sch_generic.h | 10 +--------- kernel/time/hrtimer.c | 2 +- kernel/time/timer.c | 6 ++++-- localversion-rt | 2 +- mm/swap.c | 5 +++-- 6 files changed, 19 insertions(+), 15 deletions(-) --------------------------- diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h index f390293974ea..e5207897c33e 100644 --- a/include/linux/seqlock.h +++ b/include/linux/seqlock.h @@ -489,6 +489,15 @@ static inline void write_seqlock(seqlock_t *sl) __raw_write_seqcount_begin(&sl->seqcount); } +static inline int try_write_seqlock(seqlock_t *sl) +{ + if (spin_trylock(&sl->lock)) { + __raw_write_seqcount_begin(&sl->seqcount); + return 1; + } + return 0; +} + static inline void write_sequnlock(seqlock_t *sl) { __raw_write_seqcount_end(&sl->seqcount); diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h index 112d2dca8b08..e6afb4b9cede 100644 --- a/include/net/sch_generic.h +++ b/include/net/sch_generic.h @@ -168,16 +168,8 @@ static inline bool qdisc_run_begin(struct Qdisc *qdisc) return false; } #ifdef CONFIG_PREEMPT_RT - if (spin_trylock(&qdisc->running.lock)) { - seqcount_t *s = &qdisc->running.seqcount; - /* - * Variant of write_seqcount_t_begin() telling lockdep that a - * trylock was attempted. - */ - __raw_write_seqcount_begin(s); - seqcount_acquire(&s->dep_map, 0, 1, _RET_IP_); + if (try_write_seqlock(&qdisc->running)) return true; - } return false; #else /* Variant of write_seqcount_begin() telling lockdep a trylock diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c index 41cc1c8530d8..42705a04c808 100644 --- a/kernel/time/hrtimer.c +++ b/kernel/time/hrtimer.c @@ -1819,7 +1819,7 @@ static void __hrtimer_init_sleeper(struct hrtimer_sleeper *sl, * expiry. */ if (IS_ENABLED(CONFIG_PREEMPT_RT)) { - if ((task_is_realtime(current) && !(mode & HRTIMER_MODE_SOFT)) || system_state != SYSTEM_RUNNING) + if (task_is_realtime(current) && !(mode & HRTIMER_MODE_SOFT)) mode |= HRTIMER_MODE_HARD; } diff --git a/kernel/time/timer.c b/kernel/time/timer.c index 15b838401af8..86bb218d1df5 100644 --- a/kernel/time/timer.c +++ b/kernel/time/timer.c @@ -1269,8 +1269,10 @@ static inline void timer_base_unlock_expiry(struct timer_base *base) static void timer_sync_wait_running(struct timer_base *base) { if (atomic_read(&base->timer_waiters)) { + raw_spin_unlock_irq(&base->lock); spin_unlock(&base->expiry_lock); spin_lock(&base->expiry_lock); + raw_spin_lock_irq(&base->lock); } } @@ -1461,14 +1463,14 @@ static void expire_timers(struct timer_base *base, struct hlist_head *head) if (timer->flags & TIMER_IRQSAFE) { raw_spin_unlock(&base->lock); call_timer_fn(timer, fn, baseclk); - base->running_timer = NULL; raw_spin_lock(&base->lock); + base->running_timer = NULL; } else { raw_spin_unlock_irq(&base->lock); call_timer_fn(timer, fn, baseclk); + raw_spin_lock_irq(&base->lock); base->running_timer = NULL; timer_sync_wait_running(base); - raw_spin_lock_irq(&base->lock); } } } diff --git a/localversion-rt b/localversion-rt index 38c40b21a885..272158183778 100644 --- a/localversion-rt +++ b/localversion-rt @@ -1 +1 @@ --rt45 +-rt46 diff --git a/mm/swap.c b/mm/swap.c index cdb4f1fa3a48..463cac334fcf 100644 --- a/mm/swap.c +++ b/mm/swap.c @@ -666,12 +666,13 @@ void deactivate_file_page(struct page *page) void deactivate_page(struct page *page) { if (PageLRU(page) && PageActive(page) && !PageUnevictable(page)) { - struct pagevec *pvec = &get_cpu_var(lru_deactivate_pvecs); + struct pagevec *pvec = &get_locked_var(swapvec_lock, + lru_deactivate_pvecs); get_page(page); if (!pagevec_add(pvec, page) || PageCompound(page)) pagevec_lru_move_fn(pvec, lru_deactivate_fn, NULL); - put_cpu_var(lru_deactivate_pvecs); + put_locked_var(swapvec_lock, lru_deactivate_pvecs); } }
