On Tue, Jul 17, 2018 at 12:37 PM Alan Stern <st...@rowland.harvard.edu> wrote:
>
> Why not? Instructions are allowed to migrate _into_ critical sections,
> just not _out_ of them. So a store preceding the start of a spinlocked
> region can migrate in and be executed after a load that is inside the
> region.
Hmm, yes of course. But the isync instruction description I found also
talks about the previous instructions being "completed".
But yeah, that obviously can mean just "in the store buffer", not
actually ordered.
Linus
