percpu: clean up percpu variable definitions

Percpu variable definition is about to be updated such that all percpu
symbols including the static ones must be unique.  Update percpu
variable definitions accordingly.

* as,cfq: rename ioc_count uniquely

* cpufreq: rename cpu_dbs_info uniquely

* xen: move nesting_count out of xen_evtchn_do_upcall() and rename it

* mm: move ratelimits out of balance_dirty_pages_ratelimited_nr() and
  rename it

* ipv4,6: rename cookie_scratch uniquely

* x86 perf_counter: rename prev_left to pmc_prev_left, irq_entry to
  pmc_irq_entry and nmi_entry to pmc_nmi_entry

* perf_counter: rename disable_count to perf_disable_count

* ftrace: rename test_event_disable to ftrace_test_event_disable

* kmemleak: rename test_pointer to kmemleak_test_pointer

* mce: rename next_interval to mce_next_interval

[ Impact: percpu usage cleanups, no duplicate static percpu var names ]

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Dave Jones <davej@redhat.com>
Cc: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: linux-mm <linux-mm@kvack.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <srostedt@redhat.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Andi Kleen <andi@firstfloor.org>

2 files changed, 10 insertions, 10 deletions

diff --git a/block/as-iosched.c b/block/as-iosched.c
index 7a12cf6ee1d3..ce8ba57c6557 100644
--- a/block/as-iosched.c
+++ b/block/as-iosched.c
@@ -146,7 +146,7 @@ enum arq_state {
 #define RQ_STATE(rq)    ((enum arq_state)(rq)->elevator_private2)
 #define RQ_SET_STATE(rq, state) ((rq)->elevator_private2 = (void *) state)
 
-static DEFINE_PER_CPU(unsigned long, ioc_count);
+static DEFINE_PER_CPU(unsigned long, as_ioc_count);
 static struct completion *ioc_gone;
 static DEFINE_SPINLOCK(ioc_gone_lock);
 
@@ -161,7 +161,7 @@ static void as_antic_stop(struct as_data *ad);
 static void free_as_io_context(struct as_io_context *aic)
 {
         kfree(aic);
-        elv_ioc_count_dec(ioc_count);
+        elv_ioc_count_dec(as_ioc_count);
         if (ioc_gone) {
                 /*
                  * AS scheduler is exiting, grab exit lock and check
@@ -169,7 +169,7 @@ static void free_as_io_context(struct as_io_context *aic)
                  * complete ioc_gone and set it back to NULL.
                  */
                 spin_lock(&ioc_gone_lock);
-                if (ioc_gone && !elv_ioc_count_read(ioc_count)) {
+                if (ioc_gone && !elv_ioc_count_read(as_ioc_count)) {
                         complete(ioc_gone);
                         ioc_gone = NULL;
                 }
@@ -211,7 +211,7 @@ static struct as_io_context *alloc_as_io_context(void)
                 ret->seek_total = 0;
                 ret->seek_samples = 0;
                 ret->seek_mean = 0;
-                elv_ioc_count_inc(ioc_count);
+                elv_ioc_count_inc(as_ioc_count);
         }
 
         return ret;
@@ -1507,7 +1507,7 @@ static void __exit as_exit(void)
         ioc_gone = &all_gone;
         /* ioc_gone's update must be visible before reading ioc_count */
         smp_wmb();
-        if (elv_ioc_count_read(ioc_count))
+        if (elv_ioc_count_read(as_ioc_count))
                 wait_for_completion(&all_gone);
         synchronize_rcu();
 }
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 833ec18eaa63..0f1cc7d3855e 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -48,7 +48,7 @@ static int cfq_slice_idle = HZ / 125;
 static struct kmem_cache *cfq_pool;
 static struct kmem_cache *cfq_ioc_pool;
 
-static DEFINE_PER_CPU(unsigned long, ioc_count);
+static DEFINE_PER_CPU(unsigned long, cfq_ioc_count);
 static struct completion *ioc_gone;
 static DEFINE_SPINLOCK(ioc_gone_lock);
 
@@ -1422,7 +1422,7 @@ static void cfq_cic_free_rcu(struct rcu_head *head)
         cic = container_of(head, struct cfq_io_context, rcu_head);
 
         kmem_cache_free(cfq_ioc_pool, cic);
-        elv_ioc_count_dec(ioc_count);
+        elv_ioc_count_dec(cfq_ioc_count);
 
         if (ioc_gone) {
                 /*
@@ -1431,7 +1431,7 @@ static void cfq_cic_free_rcu(struct rcu_head *head)
                  * complete ioc_gone and set it back to NULL
                  */
                 spin_lock(&ioc_gone_lock);
-                if (ioc_gone && !elv_ioc_count_read(ioc_count)) {
+                if (ioc_gone && !elv_ioc_count_read(cfq_ioc_count)) {
                         complete(ioc_gone);
                         ioc_gone = NULL;
                 }
@@ -1557,7 +1557,7 @@ cfq_alloc_io_context(struct cfq_data *cfqd, gfp_t gfp_mask)
                 INIT_HLIST_NODE(&cic->cic_list);
                 cic->dtor = cfq_free_io_context;
                 cic->exit = cfq_exit_io_context;
-                elv_ioc_count_inc(ioc_count);
+                elv_ioc_count_inc(cfq_ioc_count);
         }
 
         return cic;
@@ -2658,7 +2658,7 @@ static void __exit cfq_exit(void)
          * this also protects us from entering cfq_slab_kill() with
          * pending RCU callbacks
          */
-        if (elv_ioc_count_read(ioc_count))
+        if (elv_ioc_count_read(cfq_ioc_count))
                 wait_for_completion(&all_gone);
         cfq_slab_kill();
 }