Re: [PATCH tip/core/rcu 21/21] drivers/vhost: Remove now-redundant read_barrier_depends()

From: Peter Zijlstra
Date: Tue Dec 05 2017 - 16:57:21 EST


On Tue, Dec 05, 2017 at 11:24:49PM +0200, Michael S. Tsirkin wrote:
> READ_ONCE is really all over the place (some code literally replaced all
> memory accesses with READ/WRITE ONCE).

Yeah, so? Complain to the compiler people for forcing us into that.

> Would an API like WRITE_POINTER()/smp_store_pointer make sense,
> and READ_POINTER for symmetry?

No, the whole point of the exercise was to get away from the fact that
dependent loads are special.