Dear RT Folks, I'm pleased to announce the 3.4.15-rt26 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 Head SHA1: ea7a096a3d06bcdc415e534863a69921bc758327 Or to build 3.4.15-rt26 directly, the following patches should be applied: http://www.kernel.org/pub/linux/kernel/v3.x/linux-3.4.tar.xz http://www.kernel.org/pub/linux/kernel/v3.x/patch-3.4.15.xz http://www.kernel.org/pub/linux/kernel/projects/rt/3.4/patch-3.4.15-rt26.patch.xz You can also build from 3.4.15-rt25 by applying the incremental patch: http://www.kernel.org/pub/linux/kernel/projects/rt/3.4/incr/patch-3.4.15-rt25-rt26.patch.xz Enjoy, -- Steve Changes from 3.4.15-rt25: --- Steven Rostedt (1): Linux 3.4.15-rt26 Thomas Gleixner (2): rcu: Disable RCU_FAST_NO_HZ on RT net: netfilter: Serialize xt_write_recseq sections on RT Watanabe (1): hrtimer: Raise softirq if hrtimer irq stalled ---- include/linux/locallock.h | 4 ++++ include/linux/netfilter/x_tables.h | 7 +++++++ init/Kconfig | 2 +- kernel/hrtimer.c | 9 ++++----- localversion-rt | 2 +- net/netfilter/core.c | 6 ++++++ 6 files changed, 23 insertions(+), 7 deletions(-) --------------------------- diff --git a/include/linux/locallock.h b/include/linux/locallock.h index f1804a3..a5eea5d 100644 --- a/include/linux/locallock.h +++ b/include/linux/locallock.h @@ -25,6 +25,9 @@ struct local_irq_lock { DEFINE_PER_CPU(struct local_irq_lock, lvar) = { \ .lock = __SPIN_LOCK_UNLOCKED((lvar).lock) } +#define DECLARE_LOCAL_IRQ_LOCK(lvar) \ + DECLARE_PER_CPU(struct local_irq_lock, lvar) + #define local_irq_lock_init(lvar) \ do { \ int __cpu; \ @@ -220,6 +223,7 @@ static inline int __local_unlock_irqrestore(struct local_irq_lock *lv, #else /* PREEMPT_RT_BASE */ #define DEFINE_LOCAL_IRQ_LOCK(lvar) __typeof__(const int) lvar +#define DECLARE_LOCAL_IRQ_LOCK(lvar) extern __typeof__(const int) lvar static inline void local_irq_lock_init(int lvar) { } diff --git a/include/linux/netfilter/x_tables.h b/include/linux/netfilter/x_tables.h index 8d674a7..3f2bc57 100644 --- a/include/linux/netfilter/x_tables.h +++ b/include/linux/netfilter/x_tables.h @@ -186,6 +186,7 @@ struct xt_counters_info { #ifdef __KERNEL__ #include <linux/netdevice.h> +#include <linux/locallock.h> /** * struct xt_action_param - parameters for matches/targets @@ -466,6 +467,8 @@ extern void xt_free_table_info(struct xt_table_info *info); */ DECLARE_PER_CPU(seqcount_t, xt_recseq); +DECLARE_LOCAL_IRQ_LOCK(xt_write_lock); + /** * xt_write_recseq_begin - start of a write section * @@ -480,6 +483,9 @@ static inline unsigned int xt_write_recseq_begin(void) { unsigned int addend; + /* RT protection */ + local_lock(xt_write_lock); + /* * Low order bit of sequence is set if we already * called xt_write_recseq_begin(). @@ -510,6 +516,7 @@ static inline void xt_write_recseq_end(unsigned int addend) /* this is kind of a write_seqcount_end(), but addend is 0 or 1 */ smp_wmb(); __this_cpu_add(xt_recseq.sequence, addend); + local_unlock(xt_write_lock); } /* diff --git a/init/Kconfig b/init/Kconfig index c06208b..87afda5 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -474,7 +474,7 @@ config RCU_FANOUT_EXACT config RCU_FAST_NO_HZ bool "Accelerate last non-dyntick-idle CPU's grace periods" - depends on NO_HZ && SMP + depends on NO_HZ && SMP && !PREEMPT_RT_FULL default n help This option causes RCU to attempt to accelerate grace periods diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c index 8b3d423..9114899 100644 --- a/kernel/hrtimer.c +++ b/kernel/hrtimer.c @@ -1527,11 +1527,7 @@ retry: if (expires_next.tv64 == KTIME_MAX || !tick_program_event(expires_next, 0)) { cpu_base->hang_detected = 0; - - if (raise) - raise_softirq_irqoff(HRTIMER_SOFTIRQ); - - return; + goto out; } /* @@ -1575,6 +1571,9 @@ retry: tick_program_event(expires_next, 1); printk_once(KERN_WARNING "hrtimer: interrupt took %llu ns\n", ktime_to_ns(delta)); +out: + if (raise) + raise_softirq_irqoff(HRTIMER_SOFTIRQ); } /* diff --git a/localversion-rt b/localversion-rt index c5b71f9..2e9afd4 100644 --- a/localversion-rt +++ b/localversion-rt @@ -1 +1 @@ --rt25 +-rt26 diff --git a/net/netfilter/core.c b/net/netfilter/core.c index e1b7e05..151061b 100644 --- a/net/netfilter/core.c +++ b/net/netfilter/core.c @@ -20,11 +20,17 @@ #include <linux/proc_fs.h> #include <linux/mutex.h> #include <linux/slab.h> +#include <linux/locallock.h> #include <net/net_namespace.h> #include <net/sock.h> #include "nf_internals.h" +#ifdef CONFIG_PREEMPT_RT_BASE +DEFINE_LOCAL_IRQ_LOCK(xt_write_lock); +EXPORT_PER_CPU_SYMBOL(xt_write_lock); +#endif + static DEFINE_MUTEX(afinfo_mutex); const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO] __read_mostly; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
