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percpu_ref: replace pcpu_ prefix with percpu_

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percpu_ref uses pcpu_ prefix for internal stuff and percpu_ for
externally visible ones.  This is the same convention used in the
percpu allocator implementation.  It works fine there but percpu_ref
doesn't have too much internal-only stuff and scattered usages of
pcpu_ prefix are confusing than helpful.

This patch replaces all pcpu_ prefixes with percpu_.  This is pure
rename and there's no functional change.  Note that PCPU_REF_DEAD is
renamed to __PERCPU_REF_DEAD to signify that the flag is internal.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Kent Overstreet <kmo@daterainc.com>
This commit is contained in:
Tejun Heo 2014-09-24 13:31:48 -04:00
parent 6251f9976a
commit eecc16ba9a
2 changed files with 52 additions and 50 deletions
Download patch file Download diff file Expand all files Collapse all files

46
include/linux/percpu-refcount.h
View file

@ -13,7 +13,7 @@
*
* The refcount will have a range of 0 to ((1U << 31) - 1), i.e. one bit less
* than an atomic_t - this is because of the way shutdown works, see
* percpu_ref_kill()/PCPU_COUNT_BIAS.
* percpu_ref_kill()/PERCPU_COUNT_BIAS.
*
* Before you call percpu_ref_kill(), percpu_ref_put() does not check for the
* refcount hitting 0 - it can't, if it was in percpu mode. percpu_ref_kill()
@ -60,7 +60,7 @@ struct percpu_ref {
* The low bit of the pointer indicates whether the ref is in percpu
* mode; if set, then get/put will manipulate the atomic_t.
*/
unsigned long pcpu_count_ptr;
unsigned long percpu_count_ptr;
percpu_ref_func_t *release;
percpu_ref_func_t *confirm_kill;
struct rcu_head rcu;
@ -88,26 +88,26 @@ static inline void percpu_ref_kill(struct percpu_ref *ref)
return percpu_ref_kill_and_confirm(ref, NULL);
}
#define PCPU_REF_DEAD 1
#define __PERCPU_REF_DEAD 1
/*
* 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.
* branches as it can't assume that @ref->percpu_count is not NULL.
*/
static inline bool __pcpu_ref_alive(struct percpu_ref *ref,
unsigned long __percpu **pcpu_countp)
static inline bool __percpu_ref_alive(struct percpu_ref *ref,
unsigned long __percpu **percpu_countp)
{
unsigned long pcpu_ptr = ACCESS_ONCE(ref->pcpu_count_ptr);
unsigned long percpu_ptr = ACCESS_ONCE(ref->percpu_count_ptr);
/* paired with smp_store_release() in percpu_ref_reinit() */
smp_read_barrier_depends();
if (unlikely(pcpu_ptr & PCPU_REF_DEAD))
if (unlikely(percpu_ptr & __PERCPU_REF_DEAD))
return false;
*pcpu_countp = (unsigned long __percpu *)pcpu_ptr;
*percpu_countp = (unsigned long __percpu *)percpu_ptr;
return true;
}
@ -121,12 +121,12 @@ static inline bool __pcpu_ref_alive(struct percpu_ref *ref,
*/
static inline void percpu_ref_get(struct percpu_ref *ref)
{
unsigned long __percpu *pcpu_count;
unsigned long __percpu *percpu_count;
rcu_read_lock_sched();
if (__pcpu_ref_alive(ref, &pcpu_count))
this_cpu_inc(*pcpu_count);
if (__percpu_ref_alive(ref, &percpu_count))
this_cpu_inc(*percpu_count);
else
atomic_long_inc(&ref->count);
@ -144,13 +144,13 @@ static inline void percpu_ref_get(struct percpu_ref *ref)
*/
static inline bool percpu_ref_tryget(struct percpu_ref *ref)
{
unsigned long __percpu *pcpu_count;
unsigned long __percpu *percpu_count;
int ret;
rcu_read_lock_sched();
if (__pcpu_ref_alive(ref, &pcpu_count)) {
this_cpu_inc(*pcpu_count);
if (__percpu_ref_alive(ref, &percpu_count)) {
this_cpu_inc(*percpu_count);
ret = true;
} else {
ret = atomic_long_inc_not_zero(&ref->count);
@ -178,13 +178,13 @@ static inline bool percpu_ref_tryget(struct percpu_ref *ref)
*/
static inline bool percpu_ref_tryget_live(struct percpu_ref *ref)
{
unsigned long __percpu *pcpu_count;
unsigned long __percpu *percpu_count;
int ret = false;
rcu_read_lock_sched();
if (__pcpu_ref_alive(ref, &pcpu_count)) {
this_cpu_inc(*pcpu_count);
if (__percpu_ref_alive(ref, &percpu_count)) {
this_cpu_inc(*percpu_count);
ret = true;
}
@ -204,12 +204,12 @@ static inline bool percpu_ref_tryget_live(struct percpu_ref *ref)
*/
static inline void percpu_ref_put(struct percpu_ref *ref)
{
unsigned long __percpu *pcpu_count;
unsigned long __percpu *percpu_count;
rcu_read_lock_sched();
if (__pcpu_ref_alive(ref, &pcpu_count))
this_cpu_dec(*pcpu_count);
if (__percpu_ref_alive(ref, &percpu_count))
this_cpu_dec(*percpu_count);
else if (unlikely(atomic_long_dec_and_test(&ref->count)))
ref->release(ref);
@ -226,9 +226,9 @@ static inline void percpu_ref_put(struct percpu_ref *ref)
*/
static inline bool percpu_ref_is_zero(struct percpu_ref *ref)
{
unsigned long __percpu *pcpu_count;
unsigned long __percpu *percpu_count;
if (__pcpu_ref_alive(ref, &pcpu_count))
if (__percpu_ref_alive(ref, &percpu_count))
return false;
return !atomic_long_read(&ref->count);
}