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Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Browse source 
Pull SMP/hotplug changes from Ingo Molnar:
 "This is a pretty large, multi-arch series unifying and generalizing
  the various disjunct pieces of idle routines that architectures have
  historically copied from each other and have grown in random, wildly
  inconsistent and sometimes buggy directions:

   101 files changed, 455 insertions(+), 1328 deletions(-)

  this went through a number of review and test iterations before it was
  committed, it was tested on various architectures, was exposed to
  linux-next for quite some time - nevertheless it might cause problems
  on architectures that don't read the mailing lists and don't regularly
  test linux-next.

  This cat herding excercise was motivated by the -rt kernel, and was
  brought to you by Thomas "the Whip" Gleixner."

* 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (40 commits)
  idle: Remove GENERIC_IDLE_LOOP config switch
  um: Use generic idle loop
  ia64: Make sure interrupts enabled when we "safe_halt()"
  sparc: Use generic idle loop
  idle: Remove unused ARCH_HAS_DEFAULT_IDLE
  bfin: Fix typo in arch_cpu_idle()
  xtensa: Use generic idle loop
  x86: Use generic idle loop
  unicore: Use generic idle loop
  tile: Use generic idle loop
  tile: Enter idle with preemption disabled
  sh: Use generic idle loop
  score: Use generic idle loop
  s390: Use generic idle loop
  powerpc: Use generic idle loop
  parisc: Use generic idle loop
  openrisc: Use generic idle loop
  mn10300: Use generic idle loop
  mips: Use generic idle loop
  microblaze: Use generic idle loop
  ...
This commit is contained in:
Linus Torvalds 2013-04-30 07:50:17 -07:00
commit 8700c95adb
101 changed files with 455 additions and 1328 deletions
Download patch file Download diff file Expand all files Collapse all files

2
arch/powerpc/include/asm/thread_info.h
View file

@ -182,8 +182,6 @@ static inline bool test_thread_local_flags(unsigned int flags)
#define is_32bit_task() (1)
#endif
#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
#endif /* !__ASSEMBLY__ */
#endif /* __KERNEL__ */

87
arch/powerpc/kernel/idle.c
View file

@ -33,11 +33,6 @@
#include <asm/runlatch.h>
#include <asm/smp.h>
#ifdef CONFIG_HOTPLUG_CPU
#define cpu_should_die() cpu_is_offline(smp_processor_id())
#else
#define cpu_should_die() 0
#endif
unsigned long cpuidle_disable = IDLE_NO_OVERRIDE;
EXPORT_SYMBOL(cpuidle_disable);
@ -50,64 +45,38 @@ static int __init powersave_off(char *arg)
}
__setup("powersave=off", powersave_off);
/*
* The body of the idle task.
*/
void cpu_idle(void)
#ifdef CONFIG_HOTPLUG_CPU
void arch_cpu_idle_dead(void)
{
set_thread_flag(TIF_POLLING_NRFLAG);
while (1) {
tick_nohz_idle_enter();
rcu_idle_enter();
sched_preempt_enable_no_resched();
cpu_die();
}
#endif
while (!need_resched() && !cpu_should_die()) {
ppc64_runlatch_off();
void arch_cpu_idle(void)
{
ppc64_runlatch_off();
if (ppc_md.power_save) {
clear_thread_flag(TIF_POLLING_NRFLAG);
/*
* smp_mb is so clearing of TIF_POLLING_NRFLAG
* is ordered w.r.t. need_resched() test.
*/
smp_mb();
local_irq_disable();
/* Don't trace irqs off for idle */
stop_critical_timings();
/* check again after disabling irqs */
if (!need_resched() && !cpu_should_die())
ppc_md.power_save();
start_critical_timings();
/* Some power_save functions return with
* interrupts enabled, some don't.
*/
if (irqs_disabled())
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);
} else {
/*
* Go into low thread priority and possibly
* low power mode.
*/
HMT_low();
HMT_very_low();
}
}
HMT_medium();
ppc64_runlatch_on();
rcu_idle_exit();
tick_nohz_idle_exit();
if (cpu_should_die()) {
sched_preempt_enable_no_resched();
cpu_die();
}
schedule_preempt_disabled();
if (ppc_md.power_save) {
ppc_md.power_save();
/*
* Some power_save functions return with
* interrupts enabled, some don't.
*/
if (irqs_disabled())
local_irq_enable();
} else {
local_irq_enable();
/*
* Go into low thread priority and possibly
* low power mode.
*/
HMT_low();
HMT_very_low();
}
HMT_medium();
ppc64_runlatch_on();
}
int powersave_nap;

2
arch/powerpc/kernel/smp.c
View file

@ -669,7 +669,7 @@ __cpuinit void start_secondary(void *unused)
local_irq_enable();
cpu_idle();
cpu_startup_entry(CPUHP_ONLINE);
BUG();
}