Re: [Xen-devel] [PATCH 2/4] xen/x86: Drop erronious barriers

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 05/12/2016 19:17, Stefano Stabellini wrote:
> On Mon, 5 Dec 2016, Andrew Cooper wrote:
>> None of these barriers serve any purpose, as they are not synchronising with
>> any anything on remote CPUs.
>>
>> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>> ---
>> CC: Jan Beulich <JBeulich@xxxxxxxx>
>> CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
>> CC: Julien Grall <julien.grall@xxxxxxx>
>>
>> Restricting to just the $ARCH maintainers, as this is a project-wide sweep.
>>
>> Julien/Stefano: I think the ARM smpboot inhereted the erronious barrier usage
>> from x86, but I don't know whether further development has gained a 
>> dependence
>> on them.
> We turned them into smp_wmb already (kudos to IanC).

Right, but the entire point I am trying to argue is that they are not
needed in the first place.

~Andrew

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