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Date: Wed, 14 Nov 2012 21:37:30 +0100
From: Frederic Weisbecker <fweisbec@...il.com>
To: Ingo Molnar <mingo@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
Frederic Weisbecker <fweisbec@...il.com>,
Peter Zijlstra <peterz@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>,
Andrew Morton <akpm@...ux-foundation.org>,
Steven Rostedt <rostedt@...dmis.org>,
Paul Gortmaker <paul.gortmaker@...driver.com>,
Anish Kumar <anish198519851985@...il.com>
Subject: [GIT PULL] printk: Make it usable on nohz cpus
Ingo,
Please pull the printk support in dynticks mode patches that can
be found at:
git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git tags/printk-dynticks-for-mingo
This branch is based on top of v3.7-rc4
Head is 2fb933986dcef2db1344712162a1feb8d5736ff8:
printk: Wake up klogd using irq_work (2012-11-14 17:45:37 +0100)
Since last version, very few things have changed:
* Added acks from Steve on patches 1/7 and 2/7
* Fixed an arch_needs_cpu() redefinition due to misordered headers (reported
by Wu Fengguang).
If you get further acks from Peterz or anybody, feel free to cherry pick
the patches instead. Or I can rebase my patches to add them, either way.
Thanks.
----------------------------------------------------------------
Support for printk in dynticks mode:
* Fix two races in irq work claiming
* Generalize irq_work support to all archs
* Don't stop tick with irq works pending. This
fix is generally useful and concerns archs that
can't raise self IPIs.
* Introduce "lazy" irq works that can wait for the
next tick to be executed, unless it's stopped.
* Implement klogd wake up using irq work. This
removes the ad-hoc printk_tick()/printk_needs_cpu()
hooks and make it working even in dynticks mode.
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
----------------------------------------------------------------
Frederic Weisbecker (7):
irq_work: Fix racy IRQ_WORK_BUSY flag setting
irq_work: Fix racy check on work pending flag
irq_work: Remove CONFIG_HAVE_IRQ_WORK
nohz: Add API to check tick state
irq_work: Don't stop the tick with pending works
irq_work: Make self-IPIs optable
printk: Wake up klogd using irq_work
arch/alpha/Kconfig | 1 -
arch/arm/Kconfig | 1 -
arch/arm64/Kconfig | 1 -
arch/blackfin/Kconfig | 1 -
arch/frv/Kconfig | 1 -
arch/hexagon/Kconfig | 1 -
arch/mips/Kconfig | 1 -
arch/parisc/Kconfig | 1 -
arch/powerpc/Kconfig | 1 -
arch/s390/Kconfig | 1 -
arch/sh/Kconfig | 1 -
arch/sparc/Kconfig | 1 -
arch/x86/Kconfig | 1 -
drivers/staging/iio/trigger/Kconfig | 1 -
include/linux/irq_work.h | 20 +++++++++
include/linux/printk.h | 3 --
include/linux/tick.h | 17 +++++++-
init/Kconfig | 5 +--
kernel/irq_work.c | 76 +++++++++++++++++++++++------------
kernel/printk.c | 36 +++++++++--------
kernel/time/tick-sched.c | 7 ++--
kernel/timer.c | 1 -
22 files changed, 112 insertions(+), 67 deletions(-)
--
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