android_kernel_motorola_sm6375/kernel/time
Repository files (latest commit first)
Filename Latest commit message Latest commit date
Frederic Weisbecker 0453b435df nohz: Force boot CPU outside full dynticks range
The timekeeping job must be able to run early on boot
because there may be some pre-SMP (and thus pre-initcalls )
components that rely on it. The IO-APIC is one such users
as it tests the timer health by watching jiffies progression.

Given that it happens before we know the initial online
set, we can't rely on it to select a timekeeper. We need
one before SMP time otherwise we simply crash on boot.

To fix this and keep things simple for now, force the boot CPU
outside of the full dynticks range in any case and do this early
on kernel parameter parsing time.

We might want a trickier solution later, expecially for aSMP
architectures that need to assign housekeeping tasks to arbitrary
low power CPUs.

But it's still first pass KISS time for now.

Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Geoff Levand <geoff@infradead.org>
Cc: Gilad Ben Yossef <gilad@benyossef.com>
Cc: Hakan Akkan <hakanakkan@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Kevin Hilman <khilman@linaro.org>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
2013-04-19 13:53:14 +02:00
..
alarmtimer.c
clockevents.c clockevents: export clockevents_config_and_register for module use 2013-01-14 10:12:37 -08:00
clocksource.c
jiffies.c time: Kill xtime_lock, replacing it with jiffies_lock 2012-11-13 14:08:23 -05:00
Kconfig nohz: Improve a bit the full dynticks Kconfig documentation 2013-04-15 20:18:04 +02:00
Makefile time: remove the timecompare code. 2012-11-01 11:41:35 -04:00
ntp.c Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-02-22 19:25:09 -08:00
posix-clock.c
tick-broadcast.c nohz: Switch from "extended nohz" to "full nohz" based naming 2013-04-15 19:58:17 +02:00
tick-common.c nohz: Switch from "extended nohz" to "full nohz" based naming 2013-04-15 19:58:17 +02:00
tick-internal.h time: Kill xtime_lock, replacing it with jiffies_lock 2012-11-13 14:08:23 -05:00
tick-oneshot.c
tick-sched.c nohz: Force boot CPU outside full dynticks range 2013-04-19 13:53:14 +02:00
timeconv.c
timekeeping.c arm-soc: cleanups 2013-02-21 14:58:40 -08:00
timer_list.c
timer_stats.c