linux-kernel - Re: [ANNOUNCE] 3.6.11-rt26

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Message-ID: <20130204095438.41376edb@riff.lan>
Date:	Mon, 4 Feb 2013 09:54:38 -0600
From:	Clark Williams <williams@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>
Subject: Re: [ANNOUNCE] 3.6.11-rt26

On Mon, 4 Feb 2013 15:58:26 +0100 (CET)
Thomas Gleixner <tglx@...utronix.de> wrote:

> Dear RT Folks,
> 
> I'm pleased to announce the 3.6.11-rt26 release.
> 
> Changes since 3.6.11-rt25:
> 
>    1) Fix the RT highmem implementation on x86
> 
>    2) Support highmem + RT on ARM
> 
>    3) Fix an one off error in the generic highmem code (upstream fix
>       did not make it into 3.6.stable)
> 
>    4) Upstream SLUB fixes (Christoph Lameter)
> 
>    5) Fix a few RT issues in mmc and amba drivers
> 
>    6) Initialize local locks in mm/swap.c early
> 
>    7) Use simple wait queues for completions. This is a performance
>       improvement.
> 
>       Completions do not have complex callbacks and the wakeup path is
>       disabling interrupts anyway. So using simple wait locks with the
>       raw spinlock is not a latency problem, but the "sleeping lock"
>       in the normal waitqueue is a source for lock bouncing:
> 
>       T1  	 	   T2
>       lock(WQ)
>       wakeup(T2)
>       ---> preemption
> 			   lock(WQ)
> 			   pi_boost(T1)
> 			   wait_for_lock(WQ)
>       unlock(WQ)
>       deboost(T1)
>       ---> preemption
> 			   ....
> 
>       The simple waitqueue reduces this to:
> 		   
>       T1  	 	   T2
>       raw_lock(WQ)
>       wakeup(T2)
>       raw_unlock(WQ)
>       ---> preemption
> 			   raw_lock(WQ)	
> 			   ....
> 
> @Steven: Sorry, I forgot the stable tags on:
> 	 drivers-tty-pl011-irq-disable-madness.patch
> 	 mmci-remove-bogus-irq-save.patch
> 	 idle-state.patch
> 	 might-sleep-check-for-idle.patch
> 	 mm-swap-fix-initialization.patch
> 
> I'm still digging through my mail backlog, so I have not yet decided
> whether this is the last RT release for 3.6.
> 
> 
> The delta patch against 3.6.11-rt25 is appended below and can be found
> here:
> 
>   http://www.kernel.org/pub/linux/kernel/projects/rt/3.6/incr/patch-3.6.11-rt25-rt26.patch.xz
> 
> The RT patch against 3.6.11 can be found here:
> 
>   http://www.kernel.org/pub/linux/kernel/projects/rt/3.6/patch-3.6.11-rt26.patch.xz
> 
> The split quilt queue is available at:
> 
>   http://www.kernel.org/pub/linux/kernel/projects/rt/3.6/patches-3.6.11-rt26.tar.xz
> 
> Enjoy,
> 
> 	tglx
> 


Thomas,

I needed this change to build:

diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h
index efe4b33..3d5231f 100644
--- a/include/linux/uprobes.h
+++ b/include/linux/uprobes.h
@@ -26,6 +26,7 @@
 
 #include <linux/errno.h>
 #include <linux/rbtree.h>
+#include <linux/wait.h>
 
 struct vm_area_struct;
 struct mm_struct;


Clark

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