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workqueue: change argument of worker_maybe_bind_and_lock() to @pool

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worker_maybe_bind_and_lock() currently takes @worker but only cares
about @worker->pool.  This patch updates worker_maybe_bind_and_lock()
to take @pool instead of @worker.  This will be used to better define
synchronization rules regarding rescuer->pool updates.

This doesn't introduce any functional change.

tj: Updated the comments and description.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Lai Jiangshan 2013-02-19 12:17:02 -08:00 committed by Tejun Heo
parent f5faa0774e
commit f36dc67b27
1 changed files with 9 additions and 9 deletions
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18
kernel/workqueue.c
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@ -1504,8 +1504,10 @@ static void worker_leave_idle(struct worker *worker)
}
/**
* worker_maybe_bind_and_lock - bind worker to its cpu if possible and lock pool
* @worker: self
* worker_maybe_bind_and_lock - try to bind %current to worker_pool and lock it
* @pool: target worker_pool
*
* Bind %current to the cpu of @pool if it is associated and lock @pool.
*
* Works which are scheduled while the cpu is online must at least be
* scheduled to a worker which is bound to the cpu so that if they are
@ -1533,11 +1535,9 @@ static void worker_leave_idle(struct worker *worker)
* %true if the associated pool is online (@worker is successfully
* bound), %false if offline.
*/
static bool worker_maybe_bind_and_lock(struct worker *worker)
static bool worker_maybe_bind_and_lock(struct worker_pool *pool)
__acquires(&pool->lock)
{
struct worker_pool *pool = worker->pool;
while (true) {
/*
* The following call may fail, succeed or succeed
@ -1575,7 +1575,7 @@ __acquires(&pool->lock)
static void idle_worker_rebind(struct worker *worker)
{
/* CPU may go down again inbetween, clear UNBOUND only on success */
if (worker_maybe_bind_and_lock(worker))
if (worker_maybe_bind_and_lock(worker->pool))
worker_clr_flags(worker, WORKER_UNBOUND);
/* rebind complete, become available again */
@ -1593,7 +1593,7 @@ static void busy_worker_rebind_fn(struct work_struct *work)
{
struct worker *worker = container_of(work, struct worker, rebind_work);
if (worker_maybe_bind_and_lock(worker))
if (worker_maybe_bind_and_lock(worker->pool))
worker_clr_flags(worker, WORKER_UNBOUND);
spin_unlock_irq(&worker->pool->lock);
@ -2038,7 +2038,7 @@ static bool manage_workers(struct worker *worker)
* on @pool's current state. Try it and adjust
* %WORKER_UNBOUND accordingly.
*/
if (worker_maybe_bind_and_lock(worker))
if (worker_maybe_bind_and_lock(pool))
worker->flags &= ~WORKER_UNBOUND;
else
worker->flags |= WORKER_UNBOUND;
@ -2358,7 +2358,7 @@ repeat:
/* migrate to the target cpu if possible */
rescuer->pool = pool;
worker_maybe_bind_and_lock(rescuer);
worker_maybe_bind_and_lock(pool);
/*
* Slurp in all works issued via this workqueue and