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locking/qspinlock: Improve readability 

Restructure pv_queued_spin_steal_lock() as I found it hard to read.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Waiman Long <waiman.long@hpe.com
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2016-07-14 14:26:11 +02:00 committed by Ingo Molnar
parent c2ace36b88
commit 64a5e3cb30
1 changed files with 7 additions and 5 deletions
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12
kernel/locking/qspinlock_paravirt.h
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@ -70,11 +70,14 @@ struct pv_node {
static inline bool pv_queued_spin_steal_lock(struct qspinlock *lock)
{
struct __qspinlock *l = (void *)lock;
int ret = !(atomic_read(&lock->val) & _Q_LOCKED_PENDING_MASK) &&
(cmpxchg(&l->locked, 0, _Q_LOCKED_VAL) == 0);
qstat_inc(qstat_pv_lock_stealing, ret);
return ret;
if (!(atomic_read(&lock->val) & _Q_LOCKED_PENDING_MASK) &&
(cmpxchg(&l->locked, 0, _Q_LOCKED_VAL) == 0)) {
qstat_inc(qstat_pv_lock_stealing, true);
return true;
}
return false;
}
/*
@ -257,7 +260,6 @@ static struct pv_node *pv_unhash(struct qspinlock *lock)
static inline bool
pv_wait_early(struct pv_node *prev, int loop)
{
if ((loop & PV_PREV_CHECK_MASK) != 0)
return false;