Merge branch 'for-3.16' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu into for-3.16

Pull to receive percpu_ref_tryget[_live]() changes.  Planned cgroup
changes will make use of them.

Signed-off-by: Tejun Heo <tj@kernel.org>

3 files changed, 35 insertions, 3 deletions

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index f482f95c2c72..6ab3ee5d4a14 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -108,7 +108,7 @@ static inline bool css_tryget(struct cgroup_subsys_state *css)
 {
         if (css->flags & CSS_ROOT)
                 return true;
-        return percpu_ref_tryget(&css->refcnt);
+        return percpu_ref_tryget_live(&css->refcnt);
 }
 
 /**
diff --git a/include/linux/percpu-refcount.h b/include/linux/percpu-refcount.h
index 95961f0bf62d..dba35c411e8c 100644
--- a/include/linux/percpu-refcount.h
+++ b/include/linux/percpu-refcount.h
@@ -121,6 +121,36 @@ static inline void percpu_ref_get(struct percpu_ref *ref)
  * percpu_ref_tryget - try to increment a percpu refcount
  * @ref: percpu_ref to try-get
  *
+ * Increment a percpu refcount unless its count already reached zero.
+ * Returns %true on success; %false on failure.
+ *
+ * The caller is responsible for ensuring that @ref stays accessible.
+ */
+static inline bool percpu_ref_tryget(struct percpu_ref *ref)
+{
+        unsigned __percpu *pcpu_count;
+        int ret = false;
+
+        rcu_read_lock_sched();
+
+        pcpu_count = ACCESS_ONCE(ref->pcpu_count);
+
+        if (likely(REF_STATUS(pcpu_count) == PCPU_REF_PTR)) {
+                __this_cpu_inc(*pcpu_count);
+                ret = true;
+        } else {
+                ret = atomic_inc_not_zero(&ref->count);
+        }
+
+        rcu_read_unlock_sched();
+
+        return ret;
+}
+
+/**
+ * percpu_ref_tryget_live - try to increment a live percpu refcount
+ * @ref: percpu_ref to try-get
+ *
  * Increment a percpu refcount unless it has already been killed.  Returns
  * %true on success; %false on failure.
  *
@@ -128,8 +158,10 @@ static inline void percpu_ref_get(struct percpu_ref *ref)
  * will fail.  For such guarantee, percpu_ref_kill_and_confirm() should be
  * used.  After the confirm_kill callback is invoked, it's guaranteed that
  * no new reference will be given out by percpu_ref_tryget().
+ *
+ * The caller is responsible for ensuring that @ref stays accessible.
  */
-static inline bool percpu_ref_tryget(struct percpu_ref *ref)
+static inline bool percpu_ref_tryget_live(struct percpu_ref *ref)
 {
         unsigned __percpu *pcpu_count;
         int ret = false;
diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index e7a0b95ed527..539b3caa5748 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -29,7 +29,7 @@
  */
 #define get_cpu_var(var) (*({                           \
         preempt_disable();                              \
-        &__get_cpu_var(var); }))
+        this_cpu_ptr(&var); }))
 
 /*
  * The weird & is necessary because sparse considers (void)(var) to be