[ANNOUNCE] 3.2.9-rt15

[ANNOUNCE] 3.2.9-rt15

[Thomas Gleixner]

Dear RT Folks,

I'm pleased to announce the 3.2.9-rt15 release. There have been a few
not announced intermediate releases which are mostly updates to the
stable tree.

Changes vs. 3.2.9-rt14:

  * seqlock/seqcount live lock fixes 

    	This is a rather massive change, which fixes live locks in the
    	fs code and elsewhere.

  * acpi raw spinlock annotations reverted

    	The raw spinlock conversions cause trouble in the ACPI
    	interrupt handler code and we have no idea why we did that
    	conversion in the first place :(

	So with this revert we hopefully get reports for the initial
	problem so we can look at that for a less problematic fix.

  * Hotplug fixes [Steven Rostedt]

    	This is most of the series Steven posted yesterday. I left out
    	the hotplug core changes as we really need to come up with a
    	less ugly solution for that.
  
  * Futex deadlock fix [Steven Rostedt]

  * Ringbuffer irq disabled check [Steven Rostedt]
	
  * Scheduler state check fix [Steven Rostedt]


The incremental patch against 3.2.9-rt14 can be found here:

  http://www.kernel.org/pub/linux/kernel/projects/rt/3.2/incr/patch-3.2.9-rt14-rt15.patch.xz


The RT patch against 3.2.9 can be found here:

  http://www.kernel.org/pub/linux/kernel/projects/rt/3.2/patch-3.2.9-rt15.patch.xz


The split quilt queue is available at:

  http://www.kernel.org/pub/linux/kernel/projects/rt/3.2/patches-3.2.9-rt15.tar.xz


Enjoy,

	tglx

Re: [ANNOUNCE] 3.2.9-rt15

[Steven Rostedt]

Thomas,

Please fold this change into

   cpu-rt-make-hotplug-lock-a-sleeping-spinlock-on-rt.patch


As the patch was never tested (nor even compiled) it introduced a nasty
bug into taking a CPU down instead of fixing one.

Thanks,

-- Steve

diff --git a/kernel/cpu.c b/kernel/cpu.c
index c25b5ff..66dfb74 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -59,16 +59,20 @@ static struct {
 	int refcount;
 } cpu_hotplug = {
 	.active_writer = NULL,
+#ifdef CONFIG_PREEMPT_RT_FULL
+	.lock = __SPIN_LOCK_UNLOCKED(cpu_hotplug.lock),
+#else
 	.lock = __MUTEX_INITIALIZER(cpu_hotplug.lock),
+#endif
 	.refcount = 0,
 };
 
 #ifdef CONFIG_PREEMPT_RT_FULL
-# define hotplug_lock() spin_lock(&cpu_hotplug.lock)
-# define hotplug_unlock() spin_unlock(&cpu_hotplug.lock)
+# define hotplug_lock() rt_spin_lock(&cpu_hotplug.lock)
+# define hotplug_unlock() rt_spin_unlock(&cpu_hotplug.lock)
 #else
 # define hotplug_lock() mutex_lock(&cpu_hotplug.lock)
-# define hotplug_lock() mutex_unlock(&cpu_hotplug.lock)
+# define hotplug_unlock() mutex_unlock(&cpu_hotplug.lock)
 #endif
 
 struct hotplug_pcp {

Re: [ANNOUNCE] 3.2.9-rt15

[Fernando Lopez-Lezcano]

On 03/05/2012 02:14 PM, Steven Rostedt wrote:
> Thomas,
>
> Please fold this change into
>
>     cpu-rt-make-hotplug-lock-a-sleeping-spinlock-on-rt.patch

Thanks, this fixed the panic on shutdown I was experiencing!
-- Fernando


> As the patch was never tested (nor even compiled) it introduced a nasty
> bug into taking a CPU down instead of fixing one.
>
> Thanks,
>
> -- Steve
>
> diff --git a/kernel/cpu.c b/kernel/cpu.c
> index c25b5ff..66dfb74 100644
> --- a/kernel/cpu.c
> +++ b/kernel/cpu.c
> @@ -59,16 +59,20 @@ static struct {
>   	int refcount;
>   } cpu_hotplug = {
>   	.active_writer = NULL,
> +#ifdef CONFIG_PREEMPT_RT_FULL
> +	.lock = __SPIN_LOCK_UNLOCKED(cpu_hotplug.lock),
> +#else
>   	.lock = __MUTEX_INITIALIZER(cpu_hotplug.lock),
> +#endif
>   	.refcount = 0,
>   };
>
>   #ifdef CONFIG_PREEMPT_RT_FULL
> -# define hotplug_lock() spin_lock(&cpu_hotplug.lock)
> -# define hotplug_unlock() spin_unlock(&cpu_hotplug.lock)
> +# define hotplug_lock() rt_spin_lock(&cpu_hotplug.lock)
> +# define hotplug_unlock() rt_spin_unlock(&cpu_hotplug.lock)
>   #else
>   # define hotplug_lock() mutex_lock(&cpu_hotplug.lock)
> -# define hotplug_lock() mutex_unlock(&cpu_hotplug.lock)
> +# define hotplug_unlock() mutex_unlock(&cpu_hotplug.lock)
>   #endif
>
>   struct hotplug_pcp {
>
>
> --
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Re: [ANNOUNCE] 3.2.9-rt15

[Thomas Gleixner]

On Mon, 5 Mar 2012, Steven Rostedt wrote:

> Thomas,
> 
> Please fold this change into
> 
>    cpu-rt-make-hotplug-lock-a-sleeping-spinlock-on-rt.patch
> 
> 
> As the patch was never tested (nor even compiled) it introduced a nasty
> bug into taking a CPU down instead of fixing one.

Grr. I noticed that and fricking forgot to fix it :(

Thanks,

	tglx