Re: [PATCH 03/13] openrisc: add 1 and 2 byte cmpxchg support

Peter Zijlstra
2017-08-31T07:47:09Z

On Thu, Aug 31, 2017 at 06:58:34AM +0900, Stafford Horne wrote:
> OpenRISC only supports hardware instructions that perform 4 byte atomic
> operations. For enabling qrwlocks for upcoming SMP support 1 and 2 byte
> implementations are needed. To do this we leverage the 4 byte atomic
> operations and shift/mask the 1 and 2 byte areas as needed.
>
> This heavily borrows ideas and routines from sh and mips, which do
> something similar.

Is there value in lifting them into something common?