Re: Memory synchronization vs. interrupt handlers

[H. Peter Anvin]

On 08/28/2013 12:16 PM, Alan Stern wrote:
> Russell, Peter, and Ingo:
> 
> Can you folks enlighten us regarding this issue for some common 
> architectures?
> 

On x86, IRET is a serializing instruction; it guarantees hard
serialization of absolutely everything.

I would expect architectures that have weak memory ordering to put
appropriate barriers in the IRQ entry/exit code.

	-hpa

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/