On Tue, Dec 05, 2017 at 08:57:52PM +0100, Peter Zijlstra wrote: > On Tue, Dec 05, 2017 at 09:51:48PM +0200, Michael S. Tsirkin wrote: > > > > WRITE_ONCE(obj->val, 1); > > > > smp_wmb(); > > > > WRITE_ONCE(*foo, obj); > > > > > > I believe Peter was instead suggesting: > > > > > > WRITE_ONCE(obj->val, 1); > > > smp_store_release(foo, obj); > > > > Isn't that more expensive though? > > Depends on the architecture. The only architecture where it is more > expensive and people actually still care about is ARM I think.
Right. Why should I use the more expensive smp_store_release then? -- MST
