linux-kernel - [RFC GIT PULL] softirq: Consolidation and stack overrun fix

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Date:	Thu, 19 Sep 2013 14:51:04 -0500
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@....ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	James Hogan <james.hogan@...tec.com>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	Helge Deller <deller@....de>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [RFC GIT PULL] softirq: Consolidation and stack overrun fix

Thomas,

Please consider this patchset for pulling from:

git://github.com/fweisbec/linux-dynticks.git
	irq/core-v2

HEAD: 539b9cde35b473483c722de110133cd757015947

It fixes stacks overruns reported by Benjamin Herrenschmidt:
http://lkml.kernel.org/r/1378330796.4321.50.camel%40pasglop

And Paul Mackerras gave a feedback here:
http://lkml.kernel.org/r/20130918065101.GA22060@drongo

Of course the fix probably comes at the expense of a performance
hit due to cache switch, miss, etc... when softirq are processed
at the end of interrupts, although I haven't tried to measure that.

Thanks.

---
Frederic Weisbecker (3):
  irq: Consolidate do_softirq() arch overriden implementations
  irq: Execute softirq on its own stack on irq exit
  irq: Comment on the use of inline stack for ksoftirqd

 arch/metag/kernel/irq.c    | 56 ++++++++++++++++++-------------------------
 arch/parisc/kernel/irq.c   | 17 ++-----------
 arch/powerpc/kernel/irq.c  | 17 +------------
 arch/s390/kernel/irq.c     | 52 ++++++++++++++++------------------------
 arch/sh/kernel/irq.c       | 60 +++++++++++++++++++---------------------------
 arch/sparc/kernel/irq_64.c | 31 ++++++++----------------
 arch/x86/kernel/irq_32.c   | 34 ++++++++++----------------
 arch/x86/kernel/irq_64.c   | 18 +++-----------
 include/linux/interrupt.h  | 11 +++++++++
 kernel/softirq.c           | 13 +++++-----
 10 files changed, 115 insertions(+), 194 deletions(-)

-- 
1.8.3.1

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