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Frederic Weisbecker 2bbb6817c0 nohz: Allow rcu extended quiescent state handling seperately from tick stop 
It is assumed that rcu won't be used once we switch to tickless
mode and until we restart the tick. However this is not always
true, as in x86-64 where we dereference the idle notifiers after
the tick is stopped.

To prepare for fixing this, add two new APIs:
tick_nohz_idle_enter_norcu() and tick_nohz_idle_exit_norcu().

If no use of RCU is made in the idle loop between
tick_nohz_enter_idle() and tick_nohz_exit_idle() calls, the arch
must instead call the new *_norcu() version such that the arch doesn't
need to call rcu_idle_enter() and rcu_idle_exit().

Otherwise the arch must call tick_nohz_enter_idle() and
tick_nohz_exit_idle() and also call explicitly:

- rcu_idle_enter() after its last use of RCU before the CPU is put
to sleep.
- rcu_idle_exit() before the first use of RCU after the CPU is woken
up.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: David Miller <davem@davemloft.net>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
 		2011-12-11 10:31:36 -08:00
..
Makefile arch/tile: more /proc and /sys file support 2011-05-27 10:39:05 -04:00
asm-offsets.c arch/tile: core support for Tilera 32-bit chips. 2010-06-04 17:11:18 -04:00
backtrace.c arch/tile: factor out <arch/opcode.h> header 2011-11-03 16:58:54 -04:00
compat.c arch/tile: cleanups for tilegx compat mode 2011-05-19 22:56:13 -04:00
compat_signal.c arch/tile: support signal "exception-trace" hook 2011-05-19 22:55:59 -04:00
early_printk.c arch/tile: bomb raw_local_irq_ to arch_local_irq_ 2010-11-01 15:30:42 -04:00
entry.S arch/tile: use a cleaner technique to enable interrupt for cpu_idle() 2011-03-01 16:20:48 -05:00
futex_64.S arch/tile: finish enabling support for TILE-Gx 64-bit chip 2011-05-12 15:52:12 -04:00
hardwall.c arch/tile: more /proc and /sys file support 2011-05-27 10:39:05 -04:00
head_32.S arch/tile: support newer binutils assembler shift semantics 2011-03-17 14:32:06 -04:00
head_64.S arch/tile: finish enabling support for TILE-Gx 64-bit chip 2011-05-12 15:52:12 -04:00
hvglue.lds arch/tile: Enable more sophisticated IRQ model for 32-bit chips. 2010-07-06 13:34:01 -04:00
init_task.c arch/tile: core support for Tilera 32-bit chips. 2010-06-04 17:11:18 -04:00
intvec_32.S tile: revert change from <asm/atomic.h> to <linux/atomic.h> in asm files 2011-10-13 08:25:01 -04:00
intvec_64.S arch/tile: finish enabling support for TILE-Gx 64-bit chip 2011-05-12 15:52:12 -04:00
irq.c arch/tile: use new generic {enable,disable}_percpu_irq() routines 2011-12-03 15:31:49 -05:00
machine_kexec.c arch/tile: support 4KB page size as well as 64KB 2011-03-10 13:17:53 -05:00
messaging.c arch/tile: bomb raw_local_irq_ to arch_local_irq_ 2010-11-01 15:30:42 -04:00
module.c arch/tile: factor out <arch/opcode.h> header 2011-11-03 16:58:54 -04:00
pci-dma.c arch/tile: add a few #includes and an EXPORT to catch up with kernel changes. 2011-12-03 15:31:41 -05:00
pci.c arch/tile: add a few #includes and an EXPORT to catch up with kernel changes. 2011-12-03 15:31:41 -05:00
proc.c arch/tile: more /proc and /sys file support 2011-05-27 10:39:05 -04:00
process.c nohz: Allow rcu extended quiescent state handling seperately from tick stop 2011-12-11 10:31:36 -08:00
ptrace.c arch/tile: don't allow user code to set the PL via ptrace or signal return 2010-11-01 15:31:17 -04:00
reboot.c arch/tile: bomb raw_local_irq_ to arch_local_irq_ 2010-11-01 15:30:42 -04:00
regs_32.S arch/tile: parameterize system PLs to support KVM port 2010-10-15 15:38:09 -04:00
regs_64.S arch/tile: finish enabling support for TILE-Gx 64-bit chip 2011-05-12 15:52:12 -04:00
relocate_kernel.S arch/tile: core support for Tilera 32-bit chips. 2010-06-04 17:11:18 -04:00
setup.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
signal.c arch/tile: support signal "exception-trace" hook 2011-05-19 22:55:59 -04:00
single_step.c arch/tile: factor out <arch/opcode.h> header 2011-11-03 16:58:54 -04:00
smp.c sched: Provide scheduler_ipi() callback in response to smp_send_reschedule() 2011-04-14 08:52:32 +02:00
smpboot.c BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
stack.c arch/tile: refactor backtracing code 2011-05-02 13:49:14 -04:00
sys.c arch/tile: cleanups for tilegx compat mode 2011-05-19 22:56:13 -04:00
sysfs.c arch/tile: add a few #includes and an EXPORT to catch up with kernel changes. 2011-12-03 15:31:41 -05:00
tile-desc_32.c arch/tile: factor out <arch/opcode.h> header 2011-11-03 16:58:54 -04:00
tile-desc_64.c arch/tile: factor out <arch/opcode.h> header 2011-11-03 16:58:54 -04:00
time.c clocksource: tile: convert to use clocksource_register_hz 2011-06-03 17:26:21 -04:00
tlb.c tile: replace mm->cpu_vm_mask with mm_cpumask() 2011-05-04 14:41:44 -04:00
traps.c arch/tile: factor out <arch/opcode.h> header 2011-11-03 16:58:54 -04:00
vmlinux.lds.S percpu: Always align percpu output section to PAGE_SIZE 2011-03-24 18:50:09 +01:00