linux-kernel - [PATCH 0/8] nohz: Fix nohz kick irq work on tick v3

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Date:	Sat, 20 Sep 2014 22:30:16 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Dave Jones <davej@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Russell King <linux@....linux.org.uk>,
	Catalin Iacob <iacobcatalin@...il.com>,
	"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
	Will Deacon <will.deacon@....com>,
	Ingo Molnar <mingo@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>
Subject: [PATCH 0/8] nohz: Fix nohz kick irq work on tick v3

The v2 patches were pretty much agreed and these are mostly the same
except for a few changes:

1) "x86: Tell irq work about self IPI support" now uses cpu_has
instead of static_cpu_has. Unfortunately static_cpu_has() can't be called
before the alternatives code is initialized which is way after IRQs
are enabled for the first time on boot. Irq Work have many opportunies
to be called in that window and calling static_cpu_has() there is illegal.

2) "irq_work: Force raised irq work to run on irq work interrupt" has
a small optimization that first check from the irq_work_tick() whether
the raised list is empty before checking if the arch can raise irq work().
Since that list should be empty most of the time, this reduce the
fast-path to a single check.

I'll do pull request in a few days if no comment arise.

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
	nohz/fixes-v3

HEAD: 9b01f5bf3999a3db5b1bbd9fdfd80d8d304e94ee

Thanks,
	Frederic
---

Frederic Weisbecker (7):
      nohz: Move nohz full init call to tick init
      irq_work: Force raised irq work to run on irq work interrupt
      x86: Tell irq work about self IPI support
      arm: Tell irq work about self IPI support
      arm64: Tell irq work about self IPI support
      nohz: Consolidate nohz full init code
      nohz: nohz full depends on irq work self IPI support

Peter Zijlstra (1):
      irq_work: Introduce arch_irq_work_has_interrupt()


 arch/alpha/include/asm/Kbuild      |  1 +
 arch/arc/include/asm/Kbuild        |  1 +
 arch/arm/include/asm/irq_work.h    | 11 ++++++++
 arch/arm/kernel/smp.c              |  2 +-
 arch/arm64/include/asm/Kbuild      |  2 +-
 arch/arm64/include/asm/irq_work.h  | 11 ++++++++
 arch/arm64/include/asm/smp.h       |  2 ++
 arch/arm64/kernel/smp.c            |  2 +-
 arch/avr32/include/asm/Kbuild      |  1 +
 arch/blackfin/include/asm/Kbuild   |  1 +
 arch/c6x/include/asm/Kbuild        |  1 +
 arch/cris/include/asm/Kbuild       |  1 +
 arch/frv/include/asm/Kbuild        |  1 +
 arch/hexagon/include/asm/Kbuild    |  1 +
 arch/ia64/include/asm/Kbuild       |  1 +
 arch/m32r/include/asm/Kbuild       |  1 +
 arch/m68k/include/asm/Kbuild       |  1 +
 arch/metag/include/asm/Kbuild      |  1 +
 arch/microblaze/include/asm/Kbuild |  1 +
 arch/mips/include/asm/Kbuild       |  1 +
 arch/mn10300/include/asm/Kbuild    |  1 +
 arch/openrisc/include/asm/Kbuild   |  1 +
 arch/parisc/include/asm/Kbuild     |  1 +
 arch/powerpc/include/asm/Kbuild    |  1 +
 arch/s390/include/asm/Kbuild       |  1 +
 arch/score/include/asm/Kbuild      |  1 +
 arch/sh/include/asm/Kbuild         |  1 +
 arch/sparc/include/asm/Kbuild      |  1 +
 arch/tile/include/asm/Kbuild       |  1 +
 arch/um/include/asm/Kbuild         |  1 +
 arch/unicore32/include/asm/Kbuild  |  1 +
 arch/x86/include/asm/irq_work.h    | 11 ++++++++
 arch/x86/kernel/irq_work.c         |  2 +-
 arch/xtensa/include/asm/Kbuild     |  1 +
 include/asm-generic/irq_work.h     | 10 ++++++++
 include/linux/irq_work.h           |  3 +++
 include/linux/tick.h               |  2 --
 init/main.c                        |  1 -
 kernel/irq_work.c                  | 15 +++++++++--
 kernel/time/tick-common.c          |  1 +
 kernel/time/tick-internal.h        |  7 +++++
 kernel/time/tick-sched.c           | 52 ++++++++++++++++++++++++--------------
 kernel/time/timer.c                |  2 +-
 43 files changed, 133 insertions(+), 29 deletions(-)
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