percpu-refcount: add helpers for ->percpu_count accesses

* All four percpu_ref_*() operations implemented in the header file
  perform the same operation to determine whether the percpu_ref is
  alive and extract the percpu pointer.  Factor out the common logic
  into __pcpu_ref_alive().  This doesn't change the generated code.

* There are a couple places in percpu-refcount.c which masks out
  PCPU_REF_DEAD to obtain the percpu pointer.  Factor it out into
  pcpu_count_ptr().

* The above changes make the WARN_ON_ONCE() conditional at the top of
  percpu_ref_kill_and_confirm() the only user of REF_STATUS().  Test
  PCPU_REF_DEAD directly and remove REF_STATUS().

This patch doesn't introduce any functional change.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Kent Overstreet <kmo@daterainc.com>
Cc: Christoph Lameter <cl@linux-foundation.org>

2 files changed, 30 insertions, 22 deletions

diff --git a/include/linux/percpu-refcount.h b/include/linux/percpu-refcount.h
index bfdeb0d48e21..b62a4ee6d6ad 100644
--- a/include/linux/percpu-refcount.h
+++ b/include/linux/percpu-refcount.h
@@ -88,10 +88,25 @@ static inline void percpu_ref_kill(struct percpu_ref *ref)
         return percpu_ref_kill_and_confirm(ref, NULL);
 }
 
-#define PCPU_REF_PTR            0
 #define PCPU_REF_DEAD           1
 
-#define REF_STATUS(count)       (((unsigned long) count) & PCPU_REF_DEAD)
+/*
+ * Internal helper.  Don't use outside percpu-refcount proper.  The
+ * function doesn't return the pointer and let the caller test it for NULL
+ * because doing so forces the compiler to generate two conditional
+ * branches as it can't assume that @ref->pcpu_count is not NULL.
+ */
+static inline bool __pcpu_ref_alive(struct percpu_ref *ref,
+                                    unsigned __percpu **pcpu_countp)
+{
+        unsigned long pcpu_ptr = (unsigned long)ACCESS_ONCE(ref->pcpu_count);
+
+        if (unlikely(pcpu_ptr & PCPU_REF_DEAD))
+                return false;
+
+        *pcpu_countp = (unsigned __percpu *)pcpu_ptr;
+        return true;
+}
 
 /**
  * percpu_ref_get - increment a percpu refcount
@@ -105,9 +120,7 @@ static inline void percpu_ref_get(struct percpu_ref *ref)
 
         rcu_read_lock_sched();
 
-        pcpu_count = ACCESS_ONCE(ref->pcpu_count);
-
-        if (likely(REF_STATUS(pcpu_count) == PCPU_REF_PTR))
+        if (__pcpu_ref_alive(ref, &pcpu_count))
                 this_cpu_inc(*pcpu_count);
         else
                 atomic_inc(&ref->count);
@@ -131,9 +144,7 @@ static inline bool percpu_ref_tryget(struct percpu_ref *ref)
 
         rcu_read_lock_sched();
 
-        pcpu_count = ACCESS_ONCE(ref->pcpu_count);
-
-        if (likely(REF_STATUS(pcpu_count) == PCPU_REF_PTR)) {
+        if (__pcpu_ref_alive(ref, &pcpu_count)) {
                 this_cpu_inc(*pcpu_count);
                 ret = true;
         } else {
@@ -166,9 +177,7 @@ static inline bool percpu_ref_tryget_live(struct percpu_ref *ref)
 
         rcu_read_lock_sched();
 
-        pcpu_count = ACCESS_ONCE(ref->pcpu_count);
-
-        if (likely(REF_STATUS(pcpu_count) == PCPU_REF_PTR)) {
+        if (__pcpu_ref_alive(ref, &pcpu_count)) {
                 this_cpu_inc(*pcpu_count);
                 ret = true;
         }
@@ -191,9 +200,7 @@ static inline void percpu_ref_put(struct percpu_ref *ref)
 
         rcu_read_lock_sched();
 
-        pcpu_count = ACCESS_ONCE(ref->pcpu_count);
-
-        if (likely(REF_STATUS(pcpu_count) == PCPU_REF_PTR))
+        if (__pcpu_ref_alive(ref, &pcpu_count))
                 this_cpu_dec(*pcpu_count);
         else if (unlikely(atomic_dec_and_test(&ref->count)))
                 ref->release(ref);
diff --git a/lib/percpu-refcount.c b/lib/percpu-refcount.c
index 17bce2bccc14..087f1a04f9bc 100644
--- a/lib/percpu-refcount.c
+++ b/lib/percpu-refcount.c
@@ -31,6 +31,11 @@
 
 #define PCPU_COUNT_BIAS         (1U << 31)
 
+static unsigned __percpu *pcpu_count_ptr(struct percpu_ref *ref)
+{
+        return (unsigned __percpu *)((unsigned long)ref->pcpu_count & ~PCPU_REF_DEAD);
+}
+
 /**
  * percpu_ref_init - initialize a percpu refcount
  * @ref: percpu_ref to initialize
@@ -74,7 +79,7 @@ EXPORT_SYMBOL_GPL(percpu_ref_init);
  */
 void percpu_ref_cancel_init(struct percpu_ref *ref)
 {
-        unsigned __percpu *pcpu_count = ref->pcpu_count;
+        unsigned __percpu *pcpu_count = pcpu_count_ptr(ref);
         int cpu;
 
         WARN_ON_ONCE(atomic_read(&ref->count) != 1 + PCPU_COUNT_BIAS);
@@ -82,7 +87,7 @@ void percpu_ref_cancel_init(struct percpu_ref *ref)
         if (pcpu_count) {
                 for_each_possible_cpu(cpu)
                         WARN_ON_ONCE(*per_cpu_ptr(pcpu_count, cpu));
-                free_percpu(ref->pcpu_count);
+                free_percpu(pcpu_count);
         }
 }
 EXPORT_SYMBOL_GPL(percpu_ref_cancel_init);
@@ -90,14 +95,10 @@ EXPORT_SYMBOL_GPL(percpu_ref_cancel_init);
 static void percpu_ref_kill_rcu(struct rcu_head *rcu)
 {
         struct percpu_ref *ref = container_of(rcu, struct percpu_ref, rcu);
-        unsigned __percpu *pcpu_count = ref->pcpu_count;
+        unsigned __percpu *pcpu_count = pcpu_count_ptr(ref);
         unsigned count = 0;
         int cpu;
 
-        /* Mask out PCPU_REF_DEAD */
-        pcpu_count = (unsigned __percpu *)
-                (((unsigned long) pcpu_count) & ~PCPU_REF_DEAD);
-
         for_each_possible_cpu(cpu)
                 count += *per_cpu_ptr(pcpu_count, cpu);
 
@@ -152,7 +153,7 @@ 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_STATUS(ref->pcpu_count) == PCPU_REF_DEAD,
+        WARN_ONCE((unsigned long)ref->pcpu_count & PCPU_REF_DEAD,
                   "percpu_ref_kill() called more than once!\n");
 
         ref->pcpu_count = (unsigned __percpu *)