On Fri, Nov 08, 2013 at 11:52:38AM -0800, Tim Chen wrote:
> From: Waiman Long
>
> This patch corrects the way memory barriers are used in the MCS lock
> with smp_load_acquire and smp_store_release fucnction.
> It removes ones that are not needed.
>
> It uses architecture specific load-acquire an
> On Mon, Nov 11, 2013 at 09:17:52PM +, Tim Chen wrote:
>> An alternate implementation is
>> while (!ACCESS_ONCE(node->locked))
>> arch_mutex_cpu_relax();
>> smp_load_acquire(&node->locked);
>>
>> Leaving the smp_load_acquire at the end to provide appropriate barrier.
>>
On 11/11/2013 04:17 PM, Tim Chen wrote:
You could then augment that with [cmp]xchg_{acquire,release} as
appropriate.
+/*
* In order to acquire the lock, the caller should declare a local node and
* pass a reference of the node to this function in addition to the lock.
* If the lock has
From: Waiman Long
This patch corrects the way memory barriers are used in the MCS lock
with smp_load_acquire and smp_store_release fucnction.
It removes ones that are not needed.
It uses architecture specific load-acquire and store-release
primitives for synchronization, if available. Generic im
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