Memory barrier

[卜弋天]

Hi :
 
      memory barriers can not make order on other cpus, only the current cpu's order will be promised.
 
  
 

> Date: Fri, 9 Dec 2011 12:54:40 +0530
> Subject: Memory barrier
> From: trisha1march at gmail.com
> To: Kernelnewbies at kernelnewbies.org
> 
> Hi All,
> 
> I need small clarification on memory barrier.
> #define smp_mb()        mb()
> #define smp_rmb()       rmb()
> #define smp_wmb()       wmb()
> In case of SMP:
> is smp_mb() or smp_rmb() make order on current CPU or all cpu's
> 
> Thanks
> 
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