OpenCloudOS-Kernel/arch/alpha
Frederic Weisbecker 4c94cada48 alpha: Add missing RCU idle APIs on idle loop
In the old times, the whole idle task was considered
as an RCU quiescent state. But as RCU became more and
more successful overtime, some RCU read side critical
section have been added even in the code of some
architectures idle tasks, for tracing for example.

So nowadays, rcu_idle_enter() and rcu_idle_exit() must
be called by the architecture to tell RCU about the part
in the idle loop that doesn't make use of rcu read side
critical sections, typically the part that puts the CPU
in low power mode.

This is necessary for RCU to find the quiescent states in
idle in order to complete grace periods.

Add this missing pair of calls in the Alpha's idle loop.

Reported-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Tested-by: Michael Cree <mcree@orcon.net.nz>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: alpha <linux-alpha@vger.kernel.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: <stable@vger.kernel.org> # 3.3+
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2012-09-23 07:44:43 -07:00
..
boot Disintegrate asm/system.h for Alpha 2012-03-28 18:11:12 +01:00
include/asm Redefine ATOMIC_INIT and ATOMIC64_INIT to drop the casts 2012-08-19 08:41:19 -07:00
kernel alpha: Add missing RCU idle APIs on idle loop 2012-09-23 07:44:43 -07:00
lib alpha: Use new generic strncpy_from_user() and strnlen_user() 2012-08-19 08:41:18 -07:00
math-emu alpha: change to new Makefile flag variables 2011-01-17 05:42:13 +01:00
mm alpha/mm/fault.c: Port OOM changes to do_page_fault 2012-08-19 08:41:19 -07:00
oprofile alpha: Fix fall-out from disintegrating asm/system.h 2012-08-19 08:41:19 -07:00
Kconfig alpha: Use new generic strncpy_from_user() and strnlen_user() 2012-08-19 08:41:18 -07:00
Kconfig.debug alpha/parisc: remove config variable DEBUG_RWLOCK 2008-02-06 10:41:03 -08:00
Makefile alpha: link failure fix 2008-06-20 16:46:10 -07:00
defconfig defconfig reduction 2010-08-14 22:26:53 +02:00