Merge branch 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu

Pull percpu consistent-ops changes from Tejun Heo:
 "Way back, before the current percpu allocator was implemented, static
  and dynamic percpu memory areas were allocated and handled separately
  and had their own accessors.  The distinction has been gone for many
  years now; however, the now duplicate two sets of accessors remained
  with the pointer based ones - this_cpu_*() - evolving various other
  operations over time.  During the process, we also accumulated other
  inconsistent operations.

  This pull request contains Christoph's patches to clean up the
  duplicate accessor situation.  __get_cpu_var() uses are replaced with
  with this_cpu_ptr() and __this_cpu_ptr() with raw_cpu_ptr().

  Unfortunately, the former sometimes is tricky thanks to C being a bit
  messy with the distinction between lvalues and pointers, which led to
  a rather ugly solution for cpumask_var_t involving the introduction of
  this_cpu_cpumask_var_ptr().

  This converts most of the uses but not all.  Christoph will follow up
  with the remaining conversions in this merge window and hopefully
  remove the obsolete accessors"

* 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu: (38 commits)
  irqchip: Properly fetch the per cpu offset
  percpu: Resolve ambiguities in __get_cpu_var/cpumask_var_t -fix
  ia64: sn_nodepda cannot be assigned to after this_cpu conversion. Use __this_cpu_write.
  percpu: Resolve ambiguities in __get_cpu_var/cpumask_var_t
  Revert "powerpc: Replace __get_cpu_var uses"
  percpu: Remove __this_cpu_ptr
  clocksource: Replace __this_cpu_ptr with raw_cpu_ptr
  sparc: Replace __get_cpu_var uses
  avr32: Replace __get_cpu_var with __this_cpu_write
  blackfin: Replace __get_cpu_var uses
  tile: Use this_cpu_ptr() for hardware counters
  tile: Replace __get_cpu_var uses
  powerpc: Replace __get_cpu_var uses
  alpha: Replace __get_cpu_var
  ia64: Replace __get_cpu_var uses
  s390: cio driver &__get_cpu_var replacements
  s390: Replace __get_cpu_var uses
  mips: Replace __get_cpu_var uses
  MIPS: Replace __get_cpu_var uses in FPU emulator.
  arm: Replace __this_cpu_ptr with raw_cpu_ptr
  ...

4 files changed, 12 insertions, 12 deletions

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index acb0effd8077..1a3f0445432a 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -821,7 +821,7 @@ static void xen_convert_trap_info(const struct desc_ptr *desc,
 
 void xen_copy_trap_info(struct trap_info *traps)
 {
-        const struct desc_ptr *desc = &__get_cpu_var(idt_desc);
+        const struct desc_ptr *desc = this_cpu_ptr(&idt_desc);
 
         xen_convert_trap_info(desc, traps);
 }
@@ -838,7 +838,7 @@ static void xen_load_idt(const struct desc_ptr *desc)
 
         spin_lock(&lock);
 
-        __get_cpu_var(idt_desc) = *desc;
+        memcpy(this_cpu_ptr(&idt_desc), desc, sizeof(idt_desc));
 
         xen_convert_trap_info(desc, traps);
 
diff --git a/arch/x86/xen/multicalls.c b/arch/x86/xen/multicalls.c
index 0d82003e76ad..ea54a08d8301 100644
--- a/arch/x86/xen/multicalls.c
+++ b/arch/x86/xen/multicalls.c
@@ -54,7 +54,7 @@ DEFINE_PER_CPU(unsigned long, xen_mc_irq_flags);
 
 void xen_mc_flush(void)
 {
-        struct mc_buffer *b = &__get_cpu_var(mc_buffer);
+        struct mc_buffer *b = this_cpu_ptr(&mc_buffer);
         struct multicall_entry *mc;
         int ret = 0;
         unsigned long flags;
@@ -131,7 +131,7 @@ void xen_mc_flush(void)
 
 struct multicall_space __xen_mc_entry(size_t args)
 {
-        struct mc_buffer *b = &__get_cpu_var(mc_buffer);
+        struct mc_buffer *b = this_cpu_ptr(&mc_buffer);
         struct multicall_space ret;
         unsigned argidx = roundup(b->argidx, sizeof(u64));
 
@@ -162,7 +162,7 @@ struct multicall_space __xen_mc_entry(size_t args)
 
 struct multicall_space xen_mc_extend_args(unsigned long op, size_t size)
 {
-        struct mc_buffer *b = &__get_cpu_var(mc_buffer);
+        struct mc_buffer *b = this_cpu_ptr(&mc_buffer);
         struct multicall_space ret = { NULL, NULL };
 
         BUG_ON(preemptible());
@@ -192,7 +192,7 @@ out:
 
 void xen_mc_callback(void (*fn)(void *), void *data)
 {
-        struct mc_buffer *b = &__get_cpu_var(mc_buffer);
+        struct mc_buffer *b = this_cpu_ptr(&mc_buffer);
         struct callback *cb;
 
         if (b->cbidx == MC_BATCH) {
diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c
index 0ba5f3b967f0..23b45eb9a89c 100644
--- a/arch/x86/xen/spinlock.c
+++ b/arch/x86/xen/spinlock.c
@@ -109,7 +109,7 @@ static bool xen_pvspin = true;
 __visible void xen_lock_spinning(struct arch_spinlock *lock, __ticket_t want)
 {
         int irq = __this_cpu_read(lock_kicker_irq);
-        struct xen_lock_waiting *w = &__get_cpu_var(lock_waiting);
+        struct xen_lock_waiting *w = this_cpu_ptr(&lock_waiting);
         int cpu = smp_processor_id();
         u64 start;
         unsigned long flags;
diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index 5718b0b58b60..a1d430b112b3 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -80,7 +80,7 @@ static void get_runstate_snapshot(struct vcpu_runstate_info *res)
 
         BUG_ON(preemptible());
 
-        state = &__get_cpu_var(xen_runstate);
+        state = this_cpu_ptr(&xen_runstate);
 
         /*
          * The runstate info is always updated by the hypervisor on
@@ -123,7 +123,7 @@ static void do_stolen_accounting(void)
 
         WARN_ON(state.state != RUNSTATE_running);
 
-        snap = &__get_cpu_var(xen_runstate_snapshot);
+        snap = this_cpu_ptr(&xen_runstate_snapshot);
 
         /* work out how much time the VCPU has not been runn*ing*  */
         runnable = state.time[RUNSTATE_runnable] - snap->time[RUNSTATE_runnable];
@@ -158,7 +158,7 @@ cycle_t xen_clocksource_read(void)
         cycle_t ret;
 
         preempt_disable_notrace();
-        src = &__get_cpu_var(xen_vcpu)->time;
+        src = this_cpu_ptr(&xen_vcpu->time);
         ret = pvclock_clocksource_read(src);
         preempt_enable_notrace();
         return ret;
@@ -397,7 +397,7 @@ static DEFINE_PER_CPU(struct xen_clock_event_device, xen_clock_events) = { .evt.
 
 static irqreturn_t xen_timer_interrupt(int irq, void *dev_id)
 {
-        struct clock_event_device *evt = &__get_cpu_var(xen_clock_events).evt;
+        struct clock_event_device *evt = this_cpu_ptr(&xen_clock_events.evt);
         irqreturn_t ret;
 
         ret = IRQ_NONE;
@@ -460,7 +460,7 @@ void xen_setup_cpu_clockevents(void)
 {
         BUG_ON(preemptible());
 
-        clockevents_register_device(&__get_cpu_var(xen_clock_events).evt);
+        clockevents_register_device(this_cpu_ptr(&xen_clock_events.evt));
 }
 
 void xen_timer_resume(void)