Dear RT Folks, I'm pleased to announce the 3.10.102-rt113 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: v3.10-rt Head SHA1: 1df43a742d5375abf819762126f484afe674dbda Or to build 3.10.102-rt113 directly, the following patches should be applied: http://www.kernel.org/pub/linux/kernel/v3.x/linux-3.10.tar.xz http://www.kernel.org/pub/linux/kernel/v3.x/patch-3.10.102.xz http://www.kernel.org/pub/linux/kernel/projects/rt/3.10/patch-3.10.102-rt113.patch.xz You can also build from 3.10.102-rt112 by applying the incremental patch: http://www.kernel.org/pub/linux/kernel/projects/rt/3.10/incr/patch-3.10.102-rt112-rt113.patch.xz Enjoy, -- Steve Changes from v3.10.102-rt112: --- Corey Minyard (1): x86: Fix an RT MCE crash Josh Cartwright (1): list_bl: fixup bogus lockdep warning Rik van Riel (1): kvm, rt: change async pagefault code locking for PREEMPT_RT Sebastian Andrzej Siewior (4): net: dev: always take qdisc's busylock in __dev_xmit_skb() kernel/printk: Don't try to print from IRQ/NMI region arm: lazy preempt: correct resched condition trace: correct off by one while recording the trace-event Steven Rostedt (Red Hat) (1): Linux 3.10.102-rt113 ---- arch/arm/kernel/entry-armv.S | 6 +++++- arch/x86/kernel/cpu/mcheck/mce.c | 3 ++- arch/x86/kernel/kvm.c | 37 +++++++++++++++++++------------------ include/linux/list_bl.h | 12 +++++++----- include/trace/ftrace.h | 3 +++ kernel/printk.c | 10 ++++++++++ localversion-rt | 2 +- net/core/dev.c | 4 ++++ 8 files changed, 51 insertions(+), 26 deletions(-) --------------------------- diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S index 9b51e3faff52..06be94212de9 100644 --- a/arch/arm/kernel/entry-armv.S +++ b/arch/arm/kernel/entry-armv.S @@ -234,7 +234,11 @@ svc_preempt: bne 1b tst r0, #_TIF_NEED_RESCHED_LAZY moveq pc, r8 @ go again - b 1b + ldr r0, [tsk, #TI_PREEMPT_LAZY] @ get preempt lazy count + teq r0, #0 @ if preempt lazy count != 0 + beq 1b + mov pc, r8 @ go again + #endif __und_fault: diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c index aaf4b9b94f38..cc70d98a30f6 100644 --- a/arch/x86/kernel/cpu/mcheck/mce.c +++ b/arch/x86/kernel/cpu/mcheck/mce.c @@ -1391,7 +1391,8 @@ static int mce_notify_work_init(void) static void mce_notify_work(void) { - wake_up_process(mce_notify_helper); + if (mce_notify_helper) + wake_up_process(mce_notify_helper); } #else static void mce_notify_work(void) diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index c4ff2a916139..2434b60a39de 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -34,6 +34,7 @@ #include <linux/sched.h> #include <linux/slab.h> #include <linux/kprobes.h> +#include <linux/wait-simple.h> #include <asm/timer.h> #include <asm/cpu.h> #include <asm/traps.h> @@ -89,14 +90,14 @@ static void kvm_io_delay(void) struct kvm_task_sleep_node { struct hlist_node link; - wait_queue_head_t wq; + struct swait_head wq; u32 token; int cpu; bool halted; }; static struct kvm_task_sleep_head { - spinlock_t lock; + raw_spinlock_t lock; struct hlist_head list; } async_pf_sleepers[KVM_TASK_SLEEP_HASHSIZE]; @@ -120,17 +121,17 @@ void kvm_async_pf_task_wait(u32 token) u32 key = hash_32(token, KVM_TASK_SLEEP_HASHBITS); struct kvm_task_sleep_head *b = &async_pf_sleepers[key]; struct kvm_task_sleep_node n, *e; - DEFINE_WAIT(wait); + DEFINE_SWAITER(wait); rcu_irq_enter(); - spin_lock(&b->lock); + raw_spin_lock(&b->lock); e = _find_apf_task(b, token); if (e) { /* dummy entry exist -> wake up was delivered ahead of PF */ hlist_del(&e->link); kfree(e); - spin_unlock(&b->lock); + raw_spin_unlock(&b->lock); rcu_irq_exit(); return; @@ -139,13 +140,13 @@ void kvm_async_pf_task_wait(u32 token) n.token = token; n.cpu = smp_processor_id(); n.halted = is_idle_task(current) || preempt_count() > 1; - init_waitqueue_head(&n.wq); + init_swait_head(&n.wq); hlist_add_head(&n.link, &b->list); - spin_unlock(&b->lock); + raw_spin_unlock(&b->lock); for (;;) { if (!n.halted) - prepare_to_wait(&n.wq, &wait, TASK_UNINTERRUPTIBLE); + swait_prepare(&n.wq, &wait, TASK_UNINTERRUPTIBLE); if (hlist_unhashed(&n.link)) break; @@ -164,7 +165,7 @@ void kvm_async_pf_task_wait(u32 token) } } if (!n.halted) - finish_wait(&n.wq, &wait); + swait_finish(&n.wq, &wait); rcu_irq_exit(); return; @@ -176,8 +177,8 @@ static void apf_task_wake_one(struct kvm_task_sleep_node *n) hlist_del_init(&n->link); if (n->halted) smp_send_reschedule(n->cpu); - else if (waitqueue_active(&n->wq)) - wake_up(&n->wq); + else if (swaitqueue_active(&n->wq)) + swait_wake(&n->wq); } static void apf_task_wake_all(void) @@ -187,14 +188,14 @@ static void apf_task_wake_all(void) for (i = 0; i < KVM_TASK_SLEEP_HASHSIZE; i++) { struct hlist_node *p, *next; struct kvm_task_sleep_head *b = &async_pf_sleepers[i]; - spin_lock(&b->lock); + raw_spin_lock(&b->lock); hlist_for_each_safe(p, next, &b->list) { struct kvm_task_sleep_node *n = hlist_entry(p, typeof(*n), link); if (n->cpu == smp_processor_id()) apf_task_wake_one(n); } - spin_unlock(&b->lock); + raw_spin_unlock(&b->lock); } } @@ -210,7 +211,7 @@ void kvm_async_pf_task_wake(u32 token) } again: - spin_lock(&b->lock); + raw_spin_lock(&b->lock); n = _find_apf_task(b, token); if (!n) { /* @@ -223,17 +224,17 @@ again: * Allocation failed! Busy wait while other cpu * handles async PF. */ - spin_unlock(&b->lock); + raw_spin_unlock(&b->lock); cpu_relax(); goto again; } n->token = token; n->cpu = smp_processor_id(); - init_waitqueue_head(&n->wq); + init_swait_head(&n->wq); hlist_add_head(&n->link, &b->list); } else apf_task_wake_one(n); - spin_unlock(&b->lock); + raw_spin_unlock(&b->lock); return; } EXPORT_SYMBOL_GPL(kvm_async_pf_task_wake); @@ -482,7 +483,7 @@ void __init kvm_guest_init(void) paravirt_ops_setup(); register_reboot_notifier(&kvm_pv_reboot_nb); for (i = 0; i < KVM_TASK_SLEEP_HASHSIZE; i++) - spin_lock_init(&async_pf_sleepers[i].lock); + raw_spin_lock_init(&async_pf_sleepers[i].lock); if (kvm_para_has_feature(KVM_FEATURE_ASYNC_PF)) x86_init.irqs.trap_init = kvm_apf_trap_init; diff --git a/include/linux/list_bl.h b/include/linux/list_bl.h index d8876a0cf036..017d0f1c1eb4 100644 --- a/include/linux/list_bl.h +++ b/include/linux/list_bl.h @@ -42,13 +42,15 @@ struct hlist_bl_node { struct hlist_bl_node *next, **pprev; }; -static inline void INIT_HLIST_BL_HEAD(struct hlist_bl_head *h) -{ - h->first = NULL; #ifdef CONFIG_PREEMPT_RT_BASE - raw_spin_lock_init(&h->lock); +#define INIT_HLIST_BL_HEAD(h) \ +do { \ + (h)->first = NULL; \ + raw_spin_lock_init(&(h)->lock); \ +} while (0) +#else +#define INIT_HLIST_BL_HEAD(h) (h)->first = NULL #endif -} static inline void INIT_HLIST_BL_NODE(struct hlist_bl_node *h) { diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h index dbb47418df81..f30e85b675e8 100644 --- a/include/trace/ftrace.h +++ b/include/trace/ftrace.h @@ -526,6 +526,9 @@ ftrace_raw_event_##call(void *__data, proto) \ \ local_save_flags(irq_flags); \ pc = preempt_count(); \ + /* Account for tracepoint preempt disable */ \ + if (IS_ENABLED(CONFIG_PREEMPT)) \ + pc--; \ \ __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \ \ diff --git a/kernel/printk.c b/kernel/printk.c index 1b7fbc73c125..55b6871f21e2 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -1302,6 +1302,11 @@ static void call_console_drivers(int level, const char *text, size_t len) if (!console_drivers) return; + if (IS_ENABLED(CONFIG_PREEMPT_RT_BASE)) { + if (in_irq() || in_nmi()) + return; + } + migrate_disable(); for_each_console(con) { if (exclusive_console && con != exclusive_console) @@ -2236,6 +2241,11 @@ void console_unblank(void) { struct console *c; + if (IS_ENABLED(CONFIG_PREEMPT_RT_BASE)) { + if (in_irq() || in_nmi()) + return; + } + /* * console_unblank can no longer be called in interrupt context unless * oops_in_progress is set to 1.. diff --git a/localversion-rt b/localversion-rt index 0c40e2660574..fdcd9167ca0b 100644 --- a/localversion-rt +++ b/localversion-rt @@ -1 +1 @@ --rt112 +-rt113 diff --git a/net/core/dev.c b/net/core/dev.c index 1857dde698ca..28e1c539099f 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -2680,7 +2680,11 @@ static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, * This permits __QDISC_STATE_RUNNING owner to get the lock more often * and dequeue packets faster. */ +#ifdef CONFIG_PREEMPT_RT_FULL + contended = true; +#else contended = qdisc_is_running(q); +#endif if (unlikely(contended)) spin_lock(&q->busylock);
