2012年3月15日

[ANNOUNCE] 3.0.23-rt40


Dear RT Folks,

I'm pleased to announce the 3.0.23-rt40 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: 1a71c9ae0f844238de43681c41563a4203b7e933


Or to build 3.0.23-rt40 directly, the following patches should be applied:

http://www.kernel.org/pub/linux/kernel/v3.0/linux-3.0.tar.xz

http://www.kernel.org/pub/linux/kernel/v3.0/patch-3.0.23.xz

http://www.kernel.org/pub/linux/kernel/projects/rt/3.0/patch-3.0.23-rt40.patch.xz


You can also build from 3.0.23-rt39 by applying the incremental patch:

http://www.kernel.org/pub/linux/kernel/projects/rt/3.0/incr/patch-3.0.23-rt39-rt40.patch.xz

Enjoy,

-- Steve


Changes from 3.0.23-rt39:

---

Steven Rostedt (2):
Revert "ACPI: Convert embedded controller lock to raw spinlock"
Linux 3.0.23-rt40

Thomas Gleixner (5):
softirq: Check preemption after reenabling interrupts
rt: Introduce cpu_chill()
fs: dcache: Use cpu_chill() in trylock loops
fs: namespace: Use cpu_chill() instead of cpu_relax()
net: Use cpu_chill() instead of cpu_relax()

----
block/blk-iopoll.c | 3 +++
block/blk-softirq.c | 3 +++
drivers/acpi/ec.c | 22 +++++++++++-----------
drivers/acpi/internal.h | 2 +-
fs/autofs4/autofs_i.h | 1 +
fs/autofs4/expire.c | 2 +-
fs/dcache.c | 7 ++++---
fs/namespace.c | 3 ++-
include/linux/delay.h | 6 ++++++
include/linux/preempt.h | 3 +++
localversion-rt | 2 +-
net/core/dev.c | 6 ++++++
net/rds/ib_rdma.c | 3 ++-
13 files changed, 44 insertions(+), 19 deletions(-)
---------------------------
diff --git a/block/blk-iopoll.c b/block/blk-iopoll.c
index 58916af..f7ca9b4 100644
--- a/block/blk-iopoll.c
+++ b/block/blk-iopoll.c
@@ -38,6 +38,7 @@ void blk_iopoll_sched(struct blk_iopoll *iop)
list_add_tail(&iop->list, &__get_cpu_var(blk_cpu_iopoll));
__raise_softirq_irqoff(BLOCK_IOPOLL_SOFTIRQ);
local_irq_restore(flags);
+ preempt_check_resched_rt();
}
EXPORT_SYMBOL(blk_iopoll_sched);

@@ -135,6 +136,7 @@ static void blk_iopoll_softirq(struct softirq_action *h)
__raise_softirq_irqoff(BLOCK_IOPOLL_SOFTIRQ);

local_irq_enable();
+ preempt_check_resched_rt();
}

/**
@@ -204,6 +206,7 @@ static int __cpuinit blk_iopoll_cpu_notify(struct notifier_block *self,
&__get_cpu_var(blk_cpu_iopoll));
__raise_softirq_irqoff(BLOCK_IOPOLL_SOFTIRQ);
local_irq_enable();
+ preempt_check_resched_rt();
}

return NOTIFY_OK;
diff --git a/block/blk-softirq.c b/block/blk-softirq.c
index ee9c216..0206963 100644
--- a/block/blk-softirq.c
+++ b/block/blk-softirq.c
@@ -50,6 +50,7 @@ static void trigger_softirq(void *data)
raise_softirq_irqoff(BLOCK_SOFTIRQ);

local_irq_restore(flags);
+ preempt_check_resched_rt();
}

/*
@@ -92,6 +93,7 @@ static int __cpuinit blk_cpu_notify(struct notifier_block *self,
&__get_cpu_var(blk_cpu_done));
raise_softirq_irqoff(BLOCK_SOFTIRQ);
local_irq_enable();
+ preempt_check_resched_rt();
}

return NOTIFY_OK;
@@ -139,6 +141,7 @@ do_local:
goto do_local;

local_irq_restore(flags);
+ preempt_check_resched_rt();
}

/**
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index db0e6c3..b72a603 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -152,10 +152,10 @@ static int ec_transaction_done(struct acpi_ec *ec)
{
unsigned long flags;
int ret = 0;
- raw_spin_lock_irqsave(&ec->curr_lock, flags);
+ spin_lock_irqsave(&ec->curr_lock, flags);
if (!ec->curr || ec->curr->done)
ret = 1;
- raw_spin_unlock_irqrestore(&ec->curr_lock, flags);
+ spin_unlock_irqrestore(&ec->curr_lock, flags);
return ret;
}

@@ -169,7 +169,7 @@ static void start_transaction(struct acpi_ec *ec)
static void advance_transaction(struct acpi_ec *ec, u8 status)
{
unsigned long flags;
- raw_spin_lock_irqsave(&ec->curr_lock, flags);
+ spin_lock_irqsave(&ec->curr_lock, flags);
if (!ec->curr)
goto unlock;
if (ec->curr->wlen > ec->curr->wi) {
@@ -194,7 +194,7 @@ err:
if (in_interrupt())
++ec->curr->irq_count;
unlock:
- raw_spin_unlock_irqrestore(&ec->curr_lock, flags);
+ spin_unlock_irqrestore(&ec->curr_lock, flags);
}

static int acpi_ec_sync_query(struct acpi_ec *ec);
@@ -232,9 +232,9 @@ static int ec_poll(struct acpi_ec *ec)
if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
break;
pr_debug(PREFIX "controller reset, restart transaction\n");
- raw_spin_lock_irqsave(&ec->curr_lock, flags);
+ spin_lock_irqsave(&ec->curr_lock, flags);
start_transaction(ec);
- raw_spin_unlock_irqrestore(&ec->curr_lock, flags);
+ spin_unlock_irqrestore(&ec->curr_lock, flags);
}
return -ETIME;
}
@@ -247,17 +247,17 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,
if (EC_FLAGS_MSI)
udelay(ACPI_EC_MSI_UDELAY);
/* start transaction */
- raw_spin_lock_irqsave(&ec->curr_lock, tmp);
+ spin_lock_irqsave(&ec->curr_lock, tmp);
/* following two actions should be kept atomic */
ec->curr = t;
start_transaction(ec);
if (ec->curr->command == ACPI_EC_COMMAND_QUERY)
clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
- raw_spin_unlock_irqrestore(&ec->curr_lock, tmp);
+ spin_unlock_irqrestore(&ec->curr_lock, tmp);
ret = ec_poll(ec);
- raw_spin_lock_irqsave(&ec->curr_lock, tmp);
+ spin_lock_irqsave(&ec->curr_lock, tmp);
ec->curr = NULL;
- raw_spin_unlock_irqrestore(&ec->curr_lock, tmp);
+ spin_unlock_irqrestore(&ec->curr_lock, tmp);
return ret;
}

@@ -678,7 +678,7 @@ static struct acpi_ec *make_acpi_ec(void)
mutex_init(&ec->lock);
init_swait_head(&ec->wait);
INIT_LIST_HEAD(&ec->list);
- raw_spin_lock_init(&ec->curr_lock);
+ spin_lock_init(&ec->curr_lock);
return ec;
}

diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index 2519b6e..6f889ba 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -64,7 +64,7 @@ struct acpi_ec {
struct swait_head wait;
struct list_head list;
struct transaction *curr;
- raw_spinlock_t curr_lock;
+ spinlock_t curr_lock;
};

extern struct acpi_ec *first_ec;
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
index b620114..83424ab 100644
--- a/fs/autofs4/autofs_i.h
+++ b/fs/autofs4/autofs_i.h
@@ -34,6 +34,7 @@
#include <linux/sched.h>
#include <linux/mount.h>
#include <linux/namei.h>
+#include <linux/delay.h>
#include <asm/current.h>
#include <asm/uaccess.h>

diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c
index d8b6184..f4abda3 100644
--- a/fs/autofs4/expire.c
+++ b/fs/autofs4/expire.c
@@ -170,7 +170,7 @@ again:
parent = p->d_parent;
if (!seq_spin_trylock(&parent->d_lock)) {
seq_spin_unlock(&p->d_lock);
- cpu_relax();
+ cpu_chill();
goto relock;
}
seq_spin_unlock(&p->d_lock);
diff --git a/fs/dcache.c b/fs/dcache.c
index 10580be..eedf276 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -36,6 +36,7 @@
#include <linux/bit_spinlock.h>
#include <linux/rculist_bl.h>
#include <linux/prefetch.h>
+#include <linux/delay.h>
#include "internal.h"

/*
@@ -360,7 +361,7 @@ static inline struct dentry *dentry_kill(struct dentry *dentry, int ref)
if (inode && !spin_trylock(&inode->i_lock)) {
relock:
seq_spin_unlock(&dentry->d_lock);
- cpu_relax();
+ cpu_chill();
return dentry; /* try again with same dentry */
}
if (IS_ROOT(dentry))
@@ -738,7 +739,7 @@ relock:

if (!seq_spin_trylock(&dentry->d_lock)) {
spin_unlock(&dcache_lru_lock);
- cpu_relax();
+ cpu_chill();
goto relock;
}

@@ -2053,7 +2054,7 @@ again:
if (dentry->d_count == 1) {
if (inode && !spin_trylock(&inode->i_lock)) {
seq_spin_unlock(&dentry->d_lock);
- cpu_relax();
+ cpu_chill();
goto again;
}
dentry->d_flags &= ~DCACHE_CANT_MOUNT;
diff --git a/fs/namespace.c b/fs/namespace.c
index c563781..3270cde 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -31,6 +31,7 @@
#include <linux/idr.h>
#include <linux/fs_struct.h>
#include <linux/fsnotify.h>
+#include <linux/delay.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>
#include "pnode.h"
@@ -346,7 +347,7 @@ int mnt_want_write(struct vfsmount *mnt)
*/
while (mnt->mnt_flags & MNT_WRITE_HOLD) {
preempt_enable();
- cpu_relax();
+ cpu_chill();
preempt_disable();
}
/*
diff --git a/include/linux/delay.h b/include/linux/delay.h
index a6ecb34..e23a7c0 100644
--- a/include/linux/delay.h
+++ b/include/linux/delay.h
@@ -52,4 +52,10 @@ static inline void ssleep(unsigned int seconds)
msleep(seconds * 1000);
}

+#ifdef CONFIG_PREEMPT_RT_FULL
+# define cpu_chill() msleep(1)
+#else
+# define cpu_chill() cpu_relax()
+#endif
+
#endif /* defined(_LINUX_DELAY_H) */
diff --git a/include/linux/preempt.h b/include/linux/preempt.h
index 7a2bbbb..11412d7 100644
--- a/include/linux/preempt.h
+++ b/include/linux/preempt.h
@@ -41,8 +41,10 @@ do { \

#ifndef CONFIG_PREEMPT_RT_BASE
# define preempt_enable_no_resched() __preempt_enable_no_resched()
+# define preempt_check_resched_rt() do { } while (0)
#else
# define preempt_enable_no_resched() preempt_enable()
+# define preempt_check_resched_rt() preempt_check_resched()
#endif

#define preempt_check_resched() \
@@ -93,6 +95,7 @@ do { \
#define preempt_enable_no_resched() do { } while (0)
#define preempt_enable() do { } while (0)
#define preempt_check_resched() do { } while (0)
+#define preempt_check_resched_rt() do { } while (0)

#define preempt_disable_notrace() do { } while (0)
#define preempt_enable_no_resched_notrace() do { } while (0)
diff --git a/localversion-rt b/localversion-rt
index 5498386..2af6c89 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt39
+-rt40
diff --git a/net/core/dev.c b/net/core/dev.c
index 7606d18..b250c1d 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1705,6 +1705,7 @@ static inline void __netif_reschedule(struct Qdisc *q)
sd->output_queue_tailp = &q->next_sched;
raise_softirq_irqoff(NET_TX_SOFTIRQ);
local_irq_restore(flags);
+ preempt_check_resched_rt();
}

void __netif_schedule(struct Qdisc *q)
@@ -1726,6 +1727,7 @@ void dev_kfree_skb_irq(struct sk_buff *skb)
sd->completion_queue = skb;
raise_softirq_irqoff(NET_TX_SOFTIRQ);
local_irq_restore(flags);
+ preempt_check_resched_rt();
}
}
EXPORT_SYMBOL(dev_kfree_skb_irq);
@@ -2837,6 +2839,7 @@ enqueue:
rps_unlock(sd);

local_irq_restore(flags);
+ preempt_check_resched_rt();

atomic_long_inc(&skb->dev->rx_dropped);
kfree_skb(skb);
@@ -3659,6 +3662,7 @@ static void net_rps_action_and_irq_enable(struct softnet_data *sd)
} else
#endif
local_irq_enable();
+ preempt_check_resched_rt();
}

static int process_backlog(struct napi_struct *napi, int quota)
@@ -3731,6 +3735,7 @@ void __napi_schedule(struct napi_struct *n)
local_irq_save(flags);
____napi_schedule(&__get_cpu_var(softnet_data), n);
local_irq_restore(flags);
+ preempt_check_resched_rt();
}
EXPORT_SYMBOL(__napi_schedule);

@@ -6233,6 +6238,7 @@ static int dev_cpu_callback(struct notifier_block *nfb,

raise_softirq_irqoff(NET_TX_SOFTIRQ);
local_irq_enable();
+ preempt_check_resched_rt();

/* Process offline CPU's input_pkt_queue */
while ((skb = __skb_dequeue(&oldsd->process_queue))) {
diff --git a/net/rds/ib_rdma.c b/net/rds/ib_rdma.c
index 819c35a..256ad87 100644
--- a/net/rds/ib_rdma.c
+++ b/net/rds/ib_rdma.c
@@ -33,6 +33,7 @@
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/rculist.h>
+#include <linux/delay.h>

#include "rds.h"
#include "ib.h"
@@ -294,7 +295,7 @@ static inline void wait_clean_list_grace(void)
for_each_online_cpu(cpu) {
flag = &per_cpu(clean_list_grace, cpu);
while (test_bit(CLEAN_LIST_BUSY_BIT, flag))
- cpu_relax();
+ cpu_chill();
}
}


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投稿者 xml-rpc : 2012年3月15日 00:51
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