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Subject[ANNOUNCE] v4.11.12-rt11
Dear RT folks!

I'm pleased to announce the v4.11.12-rt11 patch set.

Changes since v4.11.12-rt10:

- Jacek Konieczny reported a lockdep splat of tcp_sk_lock vs softirq.

- Mike Galbraith fixed a lockdep splat in the zcomp driver.

- Mike Galbraith reported a locking problem in hrtimer during CPU
hotplug.

Known issues
- There was a report regarding a deadlock within the rtmutex code.

The delta patch against v4.11.12-rt10 is appended below and can be found here:

https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.11/incr/patch-4.11.12-rt10-rt11.patch.xz

You can get this release via the git tree at:

git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git v4.11.12-rt11

The RT patch against v4.11.12 can be found here:

https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.11/older/patch-4.11.12-rt11.patch.xz

The split quilt queue is available at:

https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.11/older/patches-4.11.12-rt11.tar.xz

Sebastian
diff --git a/drivers/block/zram/zcomp.c b/drivers/block/zram/zcomp.c
--- a/drivers/block/zram/zcomp.c
+++ b/drivers/block/zram/zcomp.c
@@ -120,7 +120,7 @@ struct zcomp_strm *zcomp_stream_get(struct zcomp *comp)
{
struct zcomp_strm *zstrm;

- zstrm = *this_cpu_ptr(comp->stream);
+ zstrm = *get_local_ptr(comp->stream);
spin_lock(&zstrm->zcomp_lock);
return zstrm;
}
@@ -131,6 +131,7 @@ void zcomp_stream_put(struct zcomp *comp)

zstrm = *this_cpu_ptr(comp->stream);
spin_unlock(&zstrm->zcomp_lock);
+ put_local_ptr(zstrm);
}

int zcomp_compress(struct zcomp_strm *zstrm,
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -1391,7 +1391,7 @@ static inline int hrtimer_rt_defer(struct hrtimer *timer) { return 0; }

#endif

-static void __hrtimer_run_queues(struct hrtimer_cpu_base *cpu_base, ktime_t now)
+static int __hrtimer_run_queues(struct hrtimer_cpu_base *cpu_base, ktime_t now)
{
struct hrtimer_clock_base *base = cpu_base->clock_base;
unsigned int active = cpu_base->active_bases;
@@ -1432,8 +1432,7 @@ static void __hrtimer_run_queues(struct hrtimer_cpu_base *cpu_base, ktime_t now)
raise = 1;
}
}
- if (raise)
- raise_softirq_irqoff(HRTIMER_SOFTIRQ);
+ return raise;
}

#ifdef CONFIG_HIGH_RES_TIMERS
@@ -1447,6 +1446,7 @@ void hrtimer_interrupt(struct clock_event_device *dev)
struct hrtimer_cpu_base *cpu_base = this_cpu_ptr(&hrtimer_bases);
ktime_t expires_next, now, entry_time, delta;
int retries = 0;
+ int raise;

BUG_ON(!cpu_base->hres_active);
cpu_base->nr_events++;
@@ -1465,7 +1465,7 @@ void hrtimer_interrupt(struct clock_event_device *dev)
*/
cpu_base->expires_next = KTIME_MAX;

- __hrtimer_run_queues(cpu_base, now);
+ raise = __hrtimer_run_queues(cpu_base, now);

/* Reevaluate the clock bases for the next expiry */
expires_next = __hrtimer_get_next_event(cpu_base);
@@ -1476,6 +1476,8 @@ void hrtimer_interrupt(struct clock_event_device *dev)
cpu_base->expires_next = expires_next;
cpu_base->in_hrtirq = 0;
raw_spin_unlock(&cpu_base->lock);
+ if (raise)
+ raise_softirq_irqoff(HRTIMER_SOFTIRQ);

/* Reprogramming necessary ? */
if (!tick_program_event(expires_next, 0)) {
@@ -1555,6 +1557,7 @@ void hrtimer_run_queues(void)
{
struct hrtimer_cpu_base *cpu_base = this_cpu_ptr(&hrtimer_bases);
ktime_t now;
+ int raise;

if (__hrtimer_hres_active(cpu_base))
return;
@@ -1573,8 +1576,10 @@ void hrtimer_run_queues(void)

raw_spin_lock(&cpu_base->lock);
now = hrtimer_update_base(cpu_base);
- __hrtimer_run_queues(cpu_base, now);
+ raise = __hrtimer_run_queues(cpu_base, now);
raw_spin_unlock(&cpu_base->lock);
+ if (raise)
+ raise_softirq_irqoff(HRTIMER_SOFTIRQ);
}

/*
diff --git a/localversion-rt b/localversion-rt
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt10
+-rt11
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -713,8 +713,8 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)

arg.tos = ip_hdr(skb)->tos;
arg.uid = sock_net_uid(net, sk && sk_fullsock(sk) ? sk : NULL);
- local_lock(tcp_sk_lock);
local_bh_disable();
+ local_lock(tcp_sk_lock);
ip_send_unicast_reply(*this_cpu_ptr(net->ipv4.tcp_sk),
skb, &TCP_SKB_CB(skb)->header.h4.opt,
ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
@@ -722,8 +722,8 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)

__TCP_INC_STATS(net, TCP_MIB_OUTSEGS);
__TCP_INC_STATS(net, TCP_MIB_OUTRSTS);
- local_bh_enable();
local_unlock(tcp_sk_lock);
+ local_bh_enable();

#ifdef CONFIG_TCP_MD5SIG
out:
@@ -801,16 +801,16 @@ static void tcp_v4_send_ack(const struct sock *sk,
arg.bound_dev_if = oif;
arg.tos = tos;
arg.uid = sock_net_uid(net, sk_fullsock(sk) ? sk : NULL);
- local_lock(tcp_sk_lock);
local_bh_disable();
+ local_lock(tcp_sk_lock);
ip_send_unicast_reply(*this_cpu_ptr(net->ipv4.tcp_sk),
skb, &TCP_SKB_CB(skb)->header.h4.opt,
ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
&arg, arg.iov[0].iov_len);

__TCP_INC_STATS(net, TCP_MIB_OUTSEGS);
- local_bh_enable();
local_unlock(tcp_sk_lock);
+ local_bh_enable();
}

static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb)
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