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authorTejun Heo <tj@kernel.org>2014-06-28 16:10:13 +0400
committerTejun Heo <tj@kernel.org>2014-06-28 16:10:13 +0400
commiteae7975ddf031b3084f4a5f7d88f698aefad96fb (patch)
tree5e5dd384eac28d12ac6ebcf197f92f543bd44c0d /lib/percpu-refcount.c
parentd630dc4c9adb41e5bd1e06df2dbeaf622469ddd5 (diff)
downloadlinux-eae7975ddf031b3084f4a5f7d88f698aefad96fb.tar.xz
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>
Diffstat (limited to 'lib/percpu-refcount.c')
-rw-r--r--lib/percpu-refcount.c17
1 files changed, 9 insertions, 8 deletions
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 *)