On 01/14/2016 04:04 AM, Will Deacon wrote:

Consequently, it's important that the architecture back-ends implement 
these portable primitives (e.g. smp_mb()) in a way that satisfies the 
kernel memory model so that core code doesn't need to worry about the 
underlying architecture for synchronisation purposes.

It seems you don't listen me. I said multiple times - MIPS 
implementation of SYNC_RMB/SYNC_WMB/SYNC_MB/SYNC_ACQUIRE/SYNC_RELEASE 
instructions matches the description of 
smp_rmb/smp_wmb/smp_mb/sync_acquire/sync_release from 
Documentation/memory-barriers.txt file.

What else do you want from me - RTL or microArch design for that?

- Leonid.