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

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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>
This commit is contained in:
Tejun Heo
2014-09-24 13:31:48 -04:00
parent eecc16ba9a
commit 9e804d1f58
2 changed files with 25 additions and 22 deletions
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22
lib/percpu-refcount.c
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@@ -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);