Re: [RFC 10/12] x86, rwsem: simplify __down_write

[David Howells]

Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:

> Blergh; so looking at more asm there's still a few tricks we cannot do.
> So while overall size is down, some paths do end up more expensive. (It
> typically boils down to creative use of condition flags, which is very
> hard in C)

It can be done using ISO __atomic_fetch_add() and suchlike.

David