Re: [PATCH 04/19] LoongArch: Add common headers
From: Peter Zijlstra <peterz@infradead.org>
Date: 2021-07-06 13:38:40
On Tue, Jul 06, 2021 at 02:59:22PM +0200, Arnd Bergmann wrote:
The specific registers are documented at https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN#control-and-status-registers
Urrrgghhh.... the AMOs are not only fully sequentially consistent, they're specified to be completion barriers. That seems horrifically expensive. Also, AFAICT there is no forward progress specified for LL/SC :/