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

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()

5 files changed, 7 insertions, 9 deletions

diff --git a/arch/arm64/kernel/psci.c b/arch/arm64/kernel/psci.c
index 663da771580a..3425f311c49e 100644
--- a/arch/arm64/kernel/psci.c
+++ b/arch/arm64/kernel/psci.c
@@ -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
diff --git a/include/linux/percpu-refcount.h b/include/linux/percpu-refcount.h
index 530b249f7ea4..b4337646388b 100644
--- a/include/linux/percpu-refcount.h
+++ b/include/linux/percpu-refcount.h
@@ -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,
diff --git a/kernel/irq_work.c b/kernel/irq_work.c
index 3ab9048483fa..cbf9fb899d92 100644
--- a/kernel/irq_work.c
+++ b/kernel/irq_work.c
@@ -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));
 }
 
 /*
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 1f4356037a7d..4d54b7540585 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -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));
 }
 
 /*
diff --git a/mm/percpu.c b/mm/percpu.c
index 014bab65e0ff..d39e2f4e335c 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -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);