softirq: Consolidation and stack overrun fix v2 [LWN.net]

From:		Frederic Weisbecker <fweisbec@gmail.com>
To:		LKML <linux-kernel@vger.kernel.org>
Subject:		[RFC PATCH 0/7] softirq: Consolidation and stack overrun fix v2
Date:		Wed, 25 Sep 2013 18:17:59 +0200
Message-ID:		<1380125886-10341-1-git-send-email-fweisbec@gmail.com>
Cc:		Frederic Weisbecker <fweisbec@gmail.com>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Paul Mackerras <paulus@au1.ibm.com>, Ingo Molnar <mingo@kernel.org>, Thomas Gleixner <tglx@linutronix.de>, Peter Zijlstra <peterz@infradead.org>, "H. Peter Anvin" <hpa@zytor.com>, Linus Torvalds <torvalds@linux-foundation.org>, James Hogan <james.hogan@imgtec.com>, "James E.J. Bottomley" <jejb@parisc-linux.org>, Helge Deller <deller@gmx.de>, Martin Schwidefsky <schwidefsky@de.ibm.com>, Heiko Carstens <heiko.carstens@de.ibm.com>, "David S. Miller" <davem@davemloft.net>, Andrew Morton <akpm@linux-foundation.org>, <stable@vger.kernel.org>
Archive-link:		Article, Thread

Hi,

So here is a respin after the discussion we had, plus some more
goodies:

* 1st patch is a short term pure regression fixe, with stable tag etc...
* 2nd patch now also generalize the softirq_count() check
* 4th improve debugging (just hope I did not mistake the !in_interrupt()
assumption in __do_softirq()
* more comments
* introduction of a longer term solution via a new arch symbol for archs
to tell about irq_exit() stack coverage.

Thanks.

Frederic Weisbecker (7):
  irq: Force hardirq exit's softirq processing on its own stack
  irq: Consolidate do_softirq() arch overriden implementations
  irq: Optimize call to softirq on hardirq exit
  irq: Improve a bit softirq debugging
  irq: Justify the various softirq stack choices
  irq: Optimize softirq stack selection in irq exit
  x86: Tell about irq stack coverage

 arch/metag/kernel/irq.c    | 52 ++++++++++++++++--------------------------
 arch/parisc/kernel/irq.c   | 17 ++------------
 arch/powerpc/kernel/irq.c  | 17 +-------------
 arch/s390/kernel/irq.c     | 52 +++++++++++++++++-------------------------
 arch/sh/kernel/irq.c       | 57 +++++++++++++++++-----------------------------
 arch/sparc/kernel/irq_64.c | 31 ++++++++-----------------
 arch/x86/include/asm/irq.h |  4 ++++
 arch/x86/kernel/entry_64.S |  4 ++--
 arch/x86/kernel/irq_32.c   | 30 +++++++-----------------
 arch/x86/kernel/irq_64.c   | 21 -----------------
 include/linux/interrupt.h  | 11 +++++++++
 kernel/softirq.c           | 40 ++++++++++++++++++++++++--------
 12 files changed, 130 insertions(+), 206 deletions(-)

-- 
1.8.3.1

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