[RFC] arm64: Ensure proper addressing for ldnp/stnp

[bdegraaf at codeaurora.org]

On 2016-09-19 14:28, Laura Abbott wrote:
> On 09/19/2016 10:36 AM, Brent DeGraaf wrote:
>> According to section 6.3.8 of the ARM Programmer's Guide, non-temporal
>> loads and stores do not verify that address dependency is met between 
>> a
>> load of an address to a register and a subsequent non-temporal load or
>> store using that address on the executing PE. Therefore, context 
>> switch
>> code and subroutine calls that use non-temporally accessed addresses 
>> as
>> parameters that might depend on a load of an address into an argument
>> register must ensure that ordering requirements are met by introducing
>> a barrier prior to the successive non-temporal access.  Add 
>> appropriate
>> barriers whereever this specific situation comes into play.
>> 
> 
> Was this found by code inspection or is there a (public) exciting test
> case to observe this behavior?
> 
> Thanks,
> Laura
> 

Code inspection only.

Brent