Re: [PATCH 10/17] prmem: documentation

[Peter Zijlstra]

On Wed, Oct 31, 2018 at 12:15:46AM +0200, Igor Stoppa wrote:
> On 30/10/2018 23:02, Andy Lutomirski wrote:

> > But I dislike allowing regular writes in the protected region. We
> > really only need four write primitives:
> > 
> > 1. Just write one value.  Call at any time (except NMI).
> > 
> > 2. Just copy some bytes. Same as (1) but any number of bytes.
> > 
> > 3,4: Same as 1 and 2 but must be called inside a special rare write
> > region. This is purely an optimization.
> 
> Atomic? RCU?

RCU can be done, that's not really a problem. Atomics otoh are a
problem. Having pointers makes them just work.

Andy; I understand your reason for not wanting them, but I really don't
want to duplicate everything. Is there something we can do with static
analysis to make you more comfortable with the pointer thing?