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SubjectRe: [PATCH] x86 bitops.h commentary on instruction reordering
Marcelo Tosatti wrote:
> On Fri, Aug 06, 2004 at 07:36:25PM +0400, Vladislav Bolkhovitin wrote:
>>One more question, if you don't object. How after some variable
>>assigment to make other CPUs *immediatelly* see the assigned value, i.e.
>>to make current CPU immediately flush its write cache in memory? *mb()
>>seems deal with reordering, barrier() with the compiler optimization (am
>>I right?).
> Yes correct. *mb() usually imply barrier().
> About the flush, each architecture defines its own instruction for doing so,
> PowerPC has "sync" and "isync" instructions (to flush the whole cache and instruction
> cache respectively), MIPS has "sync" and so on..

So, there is no platform independent way for doing that in the kernel?

>>The similar memory barrier spin_lock() does, but it's not
>>easy to uderstand its internal magic.

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