[ANNOUNCE] 3.2.55-rt79

From: Steven Rostedt
Date: Fri Mar 07 2014 - 12:59:00 EST

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Dear RT Folks,

I'm pleased to announce the 3.2.55-rt79 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: v3.2-rt
Head SHA1: 1db3983893d2a70342a3af66a2ea1608dc068dfa

Or to build 3.2.55-rt79 directly, the following patches should be applied:

http://www.kernel.org/pub/linux/kernel/v3.x/linux-3.2.tar.xz

http://www.kernel.org/pub/linux/kernel/v3.x/patch-3.2.55.xz

http://www.kernel.org/pub/linux/kernel/projects/rt/3.2/patch-3.2.55-rt79.patch.xz

You can also build from 3.2.55-rt78 by applying the incremental patch:

http://www.kernel.org/pub/linux/kernel/projects/rt/3.2/incr/patch-3.2.55-rt78-rt79.patch.xz

Enjoy,

-- Steve

Changes from v3.2.55-rt78:

---

Sebastian Andrzej Siewior (3):
Revert "x86: Disable IST stacks for debug/int 3/stack fault for PREEMPT_RT"
kernel/hrtimer: be non-freezeable in cpu_chill()
arm/unwind: use a raw_spin_lock

Steven Rostedt (1):
rt: Make cpu_chill() use hrtimer instead of msleep()

Steven Rostedt (Red Hat) (1):
Linux 3.2.55-rt79

Tiejun Chen (1):
rcutree/rcu_bh_qs: disable irq while calling rcu_preempt_qs()

----
arch/arm/kernel/unwind.c | 14 +++++++-------
arch/x86/include/asm/page_64_types.h | 21 ++++++---------------
arch/x86/kernel/cpu/common.c | 2 --
arch/x86/kernel/dumpstack_64.c | 4 ----
include/linux/delay.h | 2 +-
kernel/hrtimer.c | 19 +++++++++++++++++++
kernel/rcutree.c | 5 +++++
localversion-rt | 2 +-
8 files changed, 39 insertions(+), 30 deletions(-)
---------------------------
diff --git a/arch/arm/kernel/unwind.c b/arch/arm/kernel/unwind.c
index 00df012..bbafc67 100644
--- a/arch/arm/kernel/unwind.c
+++ b/arch/arm/kernel/unwind.c
@@ -87,7 +87,7 @@ extern const struct unwind_idx __start_unwind_idx[];
static const struct unwind_idx *__origin_unwind_idx;
extern const struct unwind_idx __stop_unwind_idx[];

-static DEFINE_SPINLOCK(unwind_lock);
+static DEFINE_RAW_SPINLOCK(unwind_lock);
static LIST_HEAD(unwind_tables);

/* Convert a prel31 symbol to an absolute address */
@@ -195,7 +195,7 @@ static const struct unwind_idx *unwind_find_idx(unsigned long addr)
/* module unwind tables */
struct unwind_table *table;

- spin_lock_irqsave(&unwind_lock, flags);
+ raw_spin_lock_irqsave(&unwind_lock, flags);
list_for_each_entry(table, &unwind_tables, list) {
if (addr >= table->begin_addr &&
addr < table->end_addr) {
@@ -207,7 +207,7 @@ static const struct unwind_idx *unwind_find_idx(unsigned long addr)
break;
}
}
- spin_unlock_irqrestore(&unwind_lock, flags);
+ raw_spin_unlock_irqrestore(&unwind_lock, flags);
}

pr_debug("%s: idx = %p\n", __func__, idx);
@@ -469,9 +469,9 @@ struct unwind_table *unwind_table_add(unsigned long start, unsigned long size,
tab->begin_addr = text_addr;
tab->end_addr = text_addr + text_size;

- spin_lock_irqsave(&unwind_lock, flags);
+ raw_spin_lock_irqsave(&unwind_lock, flags);
list_add_tail(&tab->list, &unwind_tables);
- spin_unlock_irqrestore(&unwind_lock, flags);
+ raw_spin_unlock_irqrestore(&unwind_lock, flags);

return tab;
}
@@ -483,9 +483,9 @@ void unwind_table_del(struct unwind_table *tab)
if (!tab)
return;

- spin_lock_irqsave(&unwind_lock, flags);
+ raw_spin_lock_irqsave(&unwind_lock, flags);
list_del(&tab->list);
- spin_unlock_irqrestore(&unwind_lock, flags);
+ raw_spin_unlock_irqrestore(&unwind_lock, flags);

kfree(tab);
}
diff --git a/arch/x86/include/asm/page_64_types.h b/arch/x86/include/asm/page_64_types.h
index 0883ecd..7639dbf 100644
--- a/arch/x86/include/asm/page_64_types.h
+++ b/arch/x86/include/asm/page_64_types.h
@@ -14,21 +14,12 @@
#define IRQ_STACK_ORDER 2
#define IRQ_STACK_SIZE (PAGE_SIZE << IRQ_STACK_ORDER)

-#ifdef CONFIG_PREEMPT_RT_FULL
-# define STACKFAULT_STACK 0
-# define DOUBLEFAULT_STACK 1
-# define NMI_STACK 2
-# define DEBUG_STACK 0
-# define MCE_STACK 3
-# define N_EXCEPTION_STACKS 3 /* hw limit: 7 */
-#else
-# define STACKFAULT_STACK 1
-# define DOUBLEFAULT_STACK 2
-# define NMI_STACK 3
-# define DEBUG_STACK 4
-# define MCE_STACK 5
-# define N_EXCEPTION_STACKS 5 /* hw limit: 7 */
-#endif
+#define STACKFAULT_STACK 1
+#define DOUBLEFAULT_STACK 2
+#define NMI_STACK 3
+#define DEBUG_STACK 4
+#define MCE_STACK 5
+#define N_EXCEPTION_STACKS 5 /* hw limit: 7 */

#define PUD_PAGE_SIZE (_AC(1, UL) << PUD_SHIFT)
#define PUD_PAGE_MASK (~(PUD_PAGE_SIZE-1))
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index edc013e..ca93cc7 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1050,9 +1050,7 @@ DEFINE_PER_CPU(unsigned int, irq_count) = -1;
*/
static const unsigned int exception_stack_sizes[N_EXCEPTION_STACKS] = {
[0 ... N_EXCEPTION_STACKS - 1] = EXCEPTION_STKSZ,
-#if DEBUG_STACK > 0
[DEBUG_STACK - 1] = DEBUG_STKSZ
-#endif
};

static DEFINE_PER_CPU_PAGE_ALIGNED(char, exception_stacks
diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c
index 352beb7..6d728d9 100644
--- a/arch/x86/kernel/dumpstack_64.c
+++ b/arch/x86/kernel/dumpstack_64.c
@@ -21,14 +21,10 @@
(N_EXCEPTION_STACKS + DEBUG_STKSZ/EXCEPTION_STKSZ - 2)

static char x86_stack_ids[][8] = {
-#if DEBUG_STACK > 0
[ DEBUG_STACK-1 ] = "#DB",
-#endif
[ NMI_STACK-1 ] = "NMI",
[ DOUBLEFAULT_STACK-1 ] = "#DF",
-#if STACKFAULT_STACK > 0
[ STACKFAULT_STACK-1 ] = "#SS",
-#endif
[ MCE_STACK-1 ] = "#MC",
#if DEBUG_STKSZ > EXCEPTION_STKSZ
[ N_EXCEPTION_STACKS ...
diff --git a/include/linux/delay.h b/include/linux/delay.h
index e23a7c0..37caab3 100644
--- a/include/linux/delay.h
+++ b/include/linux/delay.h
@@ -53,7 +53,7 @@ static inline void ssleep(unsigned int seconds)
}

#ifdef CONFIG_PREEMPT_RT_FULL
-# define cpu_chill() msleep(1)
+extern void cpu_chill(void);
#else
# define cpu_chill() cpu_relax()
#endif
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index ed0f3a1..71acc21 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -1847,6 +1847,25 @@ SYSCALL_DEFINE2(nanosleep, struct timespec __user *, rqtp,
return hrtimer_nanosleep(&tu, rmtp, HRTIMER_MODE_REL, CLOCK_MONOTONIC);
}

+#ifdef CONFIG_PREEMPT_RT_FULL
+/*
+ * Sleep for 1 ms in hope whoever holds what we want will let it go.
+ */
+void cpu_chill(void)
+{
+ struct timespec tu = {
+ .tv_nsec = NSEC_PER_MSEC,
+ };
+ unsigned int freeze_flag = current->flags & PF_NOFREEZE;
+
+ current->flags |= PF_NOFREEZE;
+ hrtimer_nanosleep(&tu, NULL, HRTIMER_MODE_REL, CLOCK_MONOTONIC);
+ if (!freeze_flag)
+ current->flags &= ~PF_NOFREEZE;
+}
+EXPORT_SYMBOL(cpu_chill);
+#endif
+
/*
* Functions related to boot-time initialization:
*/
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 82c2224..6c2ec2d 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -175,7 +175,12 @@ static void rcu_preempt_qs(int cpu);

void rcu_bh_qs(int cpu)
{
+ unsigned long flags;
+
+ /* Callers to this function, rcu_preempt_qs(), must disable irqs. */
+ local_irq_save(flags);
rcu_preempt_qs(cpu);
+ local_irq_restore(flags);
}
#else
void rcu_bh_qs(int cpu)
diff --git a/localversion-rt b/localversion-rt
index 30758e0..cf94a55 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt78
+-rt79
--
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Next message: Thomas Graf: "Re: [PATCH] openvswitch: Orphan frags before sending to userspace via Netlink to avoid guest stall"
Previous message: Mike Snitzer: "[git pull v2] device mapper fixes to include in 3.14-rc6"
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