[dpdk-stable] missing ring memory barrier in 17.11

[Luca Boccassi]

On Tue, 2019-10-01 at 09:41 +0200, Thomas Monjalon wrote:
> Hi Luca, Gavin,
> 
> It seems the fix 85cffb2eccd9 ("ring: enforce reading tail before
> slots")
> should be backported in 17.11.
> 
> This patch is missing because the root cause is wrongly identified.
> It is referenced as
> 	Fixes: c9fb3c62896f ("ring: move code in a new header file")
> in 18.02, but in reality it is from 17.05:
> 	Fixes: 0dfc98c507b1 ("ring: separate out head index
> manipulation")
> 
> Do you agree?

Hi,

Makes sense to me, and it applies cleanly (after accounting for the
source file name change). I'll queue it up for 17.11.8.

-- 
Kind regards,
Luca Boccassi