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Merge branch 'for-3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu

Browse Source 
Pull percpu updates from Tejun Heo:
 "Nothing interesting.  A patch to convert the remaining __get_cpu_var()
  users, another to fix non-critical off-by-one in an assertion and a
  cosmetic conversion to lockless_dereference() in percpu-ref.

  The back-merge from mainline is to receive lockless_dereference()"

* 'for-3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu:
  percpu: Replace smp_read_barrier_depends() with lockless_dereference()
  percpu: Convert remaining __get_cpu_var uses in 3.18-rcX
  percpu: off by one in BUG_ON()
This commit is contained in:
Linus Torvalds 2014-12-11 18:36:26 -08:00
commit eedb3d3304
5 changed files with 7 additions and 9 deletions
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4
arch/arm64/kernel/psci.c
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@ -511,7 +511,7 @@ static int cpu_psci_cpu_kill(unsigned int cpu)
static int psci_suspend_finisher(unsigned long index)
{
struct psci_power_state *state = __get_cpu_var(psci_power_state);
struct psci_power_state *state = __this_cpu_read(psci_power_state);
return psci_ops.cpu_suspend(state[index - 1],
virt_to_phys(cpu_resume));
@ -520,7 +520,7 @@ static int psci_suspend_finisher(unsigned long index)
static int __maybe_unused cpu_psci_cpu_suspend(unsigned long index)
{
int ret;
struct psci_power_state *state = __get_cpu_var(psci_power_state);
struct psci_power_state *state = __this_cpu_read(psci_power_state);
/*
* idle state index 0 corresponds to wfi, should never be called
* from the cpu_suspend operations

4
include/linux/percpu-refcount.h
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@ -128,10 +128,8 @@ static inline void percpu_ref_kill(struct percpu_ref *ref)
static inline bool __ref_is_percpu(struct percpu_ref *ref,
unsigned long __percpu **percpu_countp)
{
unsigned long percpu_ptr = ACCESS_ONCE(ref->percpu_count_ptr);
/* paired with smp_store_release() in percpu_ref_reinit() */
smp_read_barrier_depends();
unsigned long percpu_ptr = lockless_dereference(ref->percpu_count_ptr);
/*
* Theoretically, the following could test just ATOMIC; however,

4
kernel/irq_work.c
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@ -175,11 +175,11 @@ EXPORT_SYMBOL_GPL(irq_work_run);
void irq_work_tick(void)
{
struct llist_head *raised = &__get_cpu_var(raised_list);
struct llist_head *raised = this_cpu_ptr(&raised_list);
if (!llist_empty(raised) && !arch_irq_work_has_interrupt())
irq_work_run_list(raised);
irq_work_run_list(&__get_cpu_var(lazy_list));
irq_work_run_list(this_cpu_ptr(&lazy_list));
}
/*

2
kernel/time/tick-sched.c
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@ -235,7 +235,7 @@ void tick_nohz_full_kick(void)
if (!tick_nohz_full_cpu(smp_processor_id()))
return;
irq_work_queue(&__get_cpu_var(nohz_full_kick_work));
irq_work_queue(this_cpu_ptr(&nohz_full_kick_work));
}
/*

2
mm/percpu.c
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@ -1591,7 +1591,7 @@ int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
if (cpu == NR_CPUS)
continue;
PCPU_SETUP_BUG_ON(cpu > nr_cpu_ids);
PCPU_SETUP_BUG_ON(cpu >= nr_cpu_ids);
PCPU_SETUP_BUG_ON(!cpu_possible(cpu));
PCPU_SETUP_BUG_ON(unit_map[cpu] != UINT_MAX);