percpu_ref: rename things to prepare for decoupling percpu/atomic mode switch

percpu_ref will be restructured so that percpu/atomic mode switching
and reference killing are dedoupled.  In preparation, do the following
renames.

* percpu_ref->confirm_kill	-> percpu_ref->confirm_switch
* __PERCPU_REF_DEAD		-> __PERCPU_REF_ATOMIC
* __percpu_ref_alive()		-> __ref_is_percpu()

This patch is pure rename and doesn't introduce any functional
changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Kent Overstreet <kmo@daterainc.com>

1 files changed, 11 insertions, 11 deletions

diff --git a/lib/percpu-refcount.c b/lib/percpu-refcount.c
index 5aea6b7356c7..7aef590c1ef8 100644
--- a/lib/percpu-refcount.c
+++ b/lib/percpu-refcount.c
@@ -34,7 +34,7 @@
 static unsigned long __percpu *percpu_count_ptr(struct percpu_ref *ref)
 {
         return (unsigned long __percpu *)
-                (ref->percpu_count_ptr & ~__PERCPU_REF_DEAD);
+                (ref->percpu_count_ptr & ~__PERCPU_REF_ATOMIC);
 }
 
 /**
@@ -80,7 +80,7 @@ void percpu_ref_exit(struct percpu_ref *ref)
 
         if (percpu_count) {
                 free_percpu(percpu_count);
-                ref->percpu_count_ptr = __PERCPU_REF_DEAD;
+                ref->percpu_count_ptr = __PERCPU_REF_ATOMIC;
         }
 }
 EXPORT_SYMBOL_GPL(percpu_ref_exit);
@@ -117,8 +117,8 @@ static void percpu_ref_kill_rcu(struct rcu_head *rcu)
                   ref->release, atomic_long_read(&ref->count));
 
         /* @ref is viewed as dead on all CPUs, send out kill confirmation */
-        if (ref->confirm_kill)
-                ref->confirm_kill(ref);
+        if (ref->confirm_switch)
+                ref->confirm_switch(ref);
 
         /*
          * Now we're in single atomic_long_t mode with a consistent
@@ -145,11 +145,11 @@ static void percpu_ref_kill_rcu(struct rcu_head *rcu)
 void percpu_ref_kill_and_confirm(struct percpu_ref *ref,
                                  percpu_ref_func_t *confirm_kill)
 {
-        WARN_ONCE(ref->percpu_count_ptr & __PERCPU_REF_DEAD,
+        WARN_ONCE(ref->percpu_count_ptr & __PERCPU_REF_ATOMIC,
                   "%s called more than once on %pf!", __func__, ref->release);
 
-        ref->percpu_count_ptr |= __PERCPU_REF_DEAD;
-        ref->confirm_kill = confirm_kill;
+        ref->percpu_count_ptr |= __PERCPU_REF_ATOMIC;
+        ref->confirm_switch = confirm_kill;
 
         call_rcu_sched(&ref->rcu, percpu_ref_kill_rcu);
 }
@@ -178,14 +178,14 @@ void percpu_ref_reinit(struct percpu_ref *ref)
 
         /*
          * Restore per-cpu operation.  smp_store_release() is paired with
-         * smp_read_barrier_depends() in __percpu_ref_alive() and
-         * guarantees that the zeroing is visible to all percpu accesses
-         * which can see the following __PERCPU_REF_DEAD clearing.
+         * smp_read_barrier_depends() in __ref_is_percpu() and guarantees
+         * that the zeroing is visible to all percpu accesses which can see
+         * the following __PERCPU_REF_ATOMIC clearing.
          */
         for_each_possible_cpu(cpu)
                 *per_cpu_ptr(percpu_count, cpu) = 0;
 
         smp_store_release(&ref->percpu_count_ptr,
-                          ref->percpu_count_ptr & ~__PERCPU_REF_DEAD);
+                          ref->percpu_count_ptr & ~__PERCPU_REF_ATOMIC);
 }
 EXPORT_SYMBOL_GPL(percpu_ref_reinit);