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Message-ID: <20161003180539.4d15c869@gandalf.local.home>
Date: Mon, 3 Oct 2016 18:05:39 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: LKML <linux-kernel@...r.kernel.org>,
linux-rt-users <linux-rt-users@...r.kernel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>,
Carsten Emde <C.Emde@...dl.org>,
John Kacur <jkacur@...hat.com>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [ANNOUNCE] 3.4.112-rt144
Dear RT Folks,
I'm pleased to announce the 3.4.112-rt144 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: v3.4-rt
Head SHA1: 4a9c0c15edbde9dffad4ad8677ef71003ef08445
Or to build 3.4.112-rt144 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-3.4.112.xz
http://www.kernel.org/pub/linux/kernel/projects/rt/3.4/patch-3.4.112-rt144.patch.xz
You can also build from 3.4.112-rt143 by applying the incremental patch:
http://www.kernel.org/pub/linux/kernel/projects/rt/3.4/incr/patch-3.4.112-rt143-rt144.patch.xz
Enjoy,
-- Steve
Changes from v3.4.112-rt143:
---
Sebastian Andrzej Siewior (6):
timers: wakeup all timer waiters
timers: wakeup all timer waiters without holding the base lock
net: add back the missing serialization in ip_send_unicast_reply()
net: add a lock around icmp_sk()
fs/dcache: resched/chill only if we make no progress
fs/dcache: incremental fixup of the retry routine
Steven Rostedt (Red Hat) (1):
Linux 3.4.112-rt144
----
fs/dcache.c | 17 +++++++++++++++--
kernel/timer.c | 4 ++--
localversion-rt | 2 +-
net/ipv4/icmp.c | 8 ++++++++
net/ipv4/tcp_ipv4.c | 7 +++++++
5 files changed, 33 insertions(+), 5 deletions(-)
---------------------------
diff --git a/fs/dcache.c b/fs/dcache.c
index 67a137772f13..e0a439c13318 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -527,6 +527,8 @@ relock:
*/
void dput(struct dentry *dentry)
{
+ struct dentry *parent;
+
if (!dentry)
return;
@@ -564,9 +566,20 @@ repeat:
return;
kill_it:
- dentry = dentry_kill(dentry, 1);
- if (dentry)
+ parent = dentry_kill(dentry, 1);
+ if (parent) {
+ int r;
+
+ if (parent == dentry) {
+ /* the task with the highest priority won't schedule */
+ r = cond_resched();
+ if (!r)
+ cpu_chill();
+ } else {
+ dentry = parent;
+ }
goto repeat;
+ }
}
EXPORT_SYMBOL(dput);
diff --git a/kernel/timer.c b/kernel/timer.c
index c9b100922747..d94b2c463d9b 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -978,7 +978,7 @@ static void wait_for_running_timer(struct timer_list *timer)
base->running_timer != timer);
}
-# define wakeup_timer_waiters(b) wake_up(&(b)->wait_for_running_timer)
+# define wakeup_timer_waiters(b) wake_up_all(&(b)->wait_for_running_timer)
#else
static inline void wait_for_running_timer(struct timer_list *timer)
{
@@ -1235,8 +1235,8 @@ static inline void __run_timers(struct tvec_base *base)
spin_lock_irq(&base->lock);
}
}
- wakeup_timer_waiters(base);
spin_unlock_irq(&base->lock);
+ wakeup_timer_waiters(base);
}
#ifdef CONFIG_NO_HZ
diff --git a/localversion-rt b/localversion-rt
index a7cc5d609b19..b479c897962f 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt143
+-rt144
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index 9a37732e8f32..a0d96df4cd2d 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -78,6 +78,7 @@
#include <linux/string.h>
#include <linux/netfilter_ipv4.h>
#include <linux/slab.h>
+#include <linux/locallock.h>
#include <net/snmp.h>
#include <net/ip.h>
#include <net/route.h>
@@ -203,6 +204,8 @@ static const struct icmp_control icmp_pointers[NR_ICMP_TYPES+1];
*
* On SMP we have one ICMP socket per-cpu.
*/
+static DEFINE_LOCAL_IRQ_LOCK(icmp_sk_lock);
+
static struct sock *icmp_sk(struct net *net)
{
return net->ipv4.icmp_sk[smp_processor_id()];
@@ -214,12 +217,14 @@ static inline struct sock *icmp_xmit_lock(struct net *net)
local_bh_disable();
+ local_lock(icmp_sk_lock);
sk = icmp_sk(net);
if (unlikely(!spin_trylock(&sk->sk_lock.slock))) {
/* This can happen if the output path signals a
* dst_link_failure() for an outgoing ICMP packet.
*/
+ local_unlock(icmp_sk_lock);
local_bh_enable();
return NULL;
}
@@ -229,6 +234,7 @@ static inline struct sock *icmp_xmit_lock(struct net *net)
static inline void icmp_xmit_unlock(struct sock *sk)
{
spin_unlock_bh(&sk->sk_lock.slock);
+ local_unlock(icmp_sk_lock);
}
/*
@@ -299,6 +305,7 @@ static void icmp_push_reply(struct icmp_bxm *icmp_param,
struct sock *sk;
struct sk_buff *skb;
+ local_lock(icmp_sk_lock);
sk = icmp_sk(dev_net((*rt)->dst.dev));
if (ip_append_data(sk, fl4, icmp_glue_bits, icmp_param,
icmp_param->data_len+icmp_param->head_len,
@@ -321,6 +328,7 @@ static void icmp_push_reply(struct icmp_bxm *icmp_param,
skb->ip_summed = CHECKSUM_NONE;
ip_push_pending_frames(sk, fl4);
}
+ local_unlock(icmp_sk_lock);
}
/*
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 727678dc7968..0981d537d8dd 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -62,6 +62,7 @@
#include <linux/init.h>
#include <linux/times.h>
#include <linux/slab.h>
+#include <linux/locallock.h>
#include <net/net_namespace.h>
#include <net/icmp.h>
@@ -569,6 +570,7 @@ int tcp_v4_gso_send_check(struct sk_buff *skb)
return 0;
}
+static DEFINE_LOCAL_IRQ_LOCK(tcp_sk_lock);
/*
* This routine will send an RST to the other tcp.
*
@@ -686,8 +688,11 @@ static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb)
net = dev_net(skb_dst(skb)->dev);
arg.tos = ip_hdr(skb)->tos;
+
+ local_lock(tcp_sk_lock);
ip_send_reply(net->ipv4.tcp_sock, skb, ip_hdr(skb)->saddr,
&arg, arg.iov[0].iov_len);
+ local_unlock(tcp_sk_lock);
TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS);
@@ -769,8 +774,10 @@ static void tcp_v4_send_ack(struct sk_buff *skb, u32 seq, u32 ack,
if (oif)
arg.bound_dev_if = oif;
arg.tos = tos;
+ local_lock(tcp_sk_lock);
ip_send_reply(net->ipv4.tcp_sock, skb, ip_hdr(skb)->saddr,
&arg, arg.iov[0].iov_len);
+ local_unlock(tcp_sk_lock);
TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
}
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