Re: [PATCH v10 07/19] qspinlock: Use a simple write to grab the lock, if applicable

From: Waiman Long
Date: Fri May 09 2014 - 21:06:38 EST


On 05/08/2014 03:02 PM, Peter Zijlstra wrote:
On Wed, May 07, 2014 at 11:01:35AM -0400, Waiman Long wrote:
/**
+ * get_qlock - Set the lock bit and own the lock
+ * @lock: Pointer to queue spinlock structure
+ *
+ * This routine should only be called when the caller is the only one
+ * entitled to acquire the lock.
+ */
+static __always_inline void get_qlock(struct qspinlock *lock)
set_locked()

+{
+ struct __qspinlock *l = (void *)lock;
+
+ barrier();
+ ACCESS_ONCE(l->locked) = _Q_LOCKED_VAL;
+ barrier();
+}
get_qlock() is just horrible. The function doesn't actually _get_
anything, and qlock is not in line with the rest of the naming.

Sure, I will make the change.

-Longman
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