linux/drivers/clocksource
Thomas Gleixner d48fc63f6f Revert "clocksource: Load the ACPI PM clocksource asynchronously"
This reverts commit b519508298.

The reason for this revert is that making the frequency verification
preemptible and interruptible is not working reliably. Michaels
machine failed to use PM-timer with the message:

  PM-Timer running at invalid rate: 113% of normal - aborting.

That's not a surprise as the frequency verification does rely on
interrupts being disabled. With a async scheduled thread there is no
guarantee to achieve the same result. Also some driver might fiddle
with the CTC channel 2 during the verification period, which makes the
result even more random and unpredictable.

This can be solved by using the same mechanism as we use in the
deferred TSC validation code, but that only will work if we verified a
working HPET _BEFORE_ trying to do the PM-Timer lazy validation.

So for now reverting is the safe option.

Bisected-by: Michael Witten <mfwitten@gmail.com>
Cc: Arjan van de Ven <arjanvandeven@gmail.com>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: John Stultz <johnstul@us.ibm.com>
Cc: Len Brown <lenb@kernel.org>
LKML-Reference: <alpine.LFD.2.02.1204112303270.2542@ionos>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2012-04-12 00:05:05 +02:00
..
Kconfig Merge branch 'devel-stable' into for-linus 2012-03-27 11:30:31 +01:00
Makefile clocksource: add DBX500 PRCMU Timer support 2011-09-22 15:42:57 +02:00
acpi_pm.c Revert "clocksource: Load the ACPI PM clocksource asynchronously" 2012-04-12 00:05:05 +02:00
clksrc-dbx500-prcmu.c clocksource: dbx500: convert to clocksource_register_hz() 2012-02-01 18:37:37 -08:00
cs5535-clockevt.c cs5535-clockevt: Allow the MFGPT IRQ to be shared 2012-03-06 14:17:45 +01:00
cyclone.c clocksource: cyclone: Add missing iounmap 2012-01-26 19:30:40 -08:00
dw_apb_timer.c dw_apb_timer: constify clocksource name 2011-10-04 13:08:18 -07:00
i8253.c time: x86: Replace LATCH with PIT_LATCH in i8253 clocksource driver 2011-11-21 19:00:59 -08:00
mmio.c clocksource: add common mmio clocksource 2011-05-23 18:04:51 +01:00
scx200_hrt.c clocksource: scx200_hrt: Fix the build 2012-02-22 13:25:16 +01:00
sh_cmt.c PM / shmobile: Make CMT driver use pm_genpd_dev_always_on() 2012-03-16 21:45:13 +01:00
sh_mtu2.c PM / shmobile: Make MTU2 driver use pm_genpd_dev_always_on() 2012-03-16 21:45:26 +01:00
sh_tmu.c PM / shmobile: Make TMU driver use pm_genpd_dev_always_on() 2012-03-16 21:45:06 +01:00
tcb_clksrc.c ARM: at91/tc/clocksource: Add 32 bit variant to Timer Counter 2012-03-01 13:38:49 +01:00