Re: [PATCH v2 4/4] x86/static_call: Add inline static call implementation for x86-64

[Linus Torvalds]

On Thu, Nov 29, 2018 at 9:13 AM Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
>
> No, we really do need to sync after we change the second part of the
> command with the int3 on it. Unless there's another way to guarantee
> that the full instruction gets seen when we replace the int3 with the
> finished command.

Making sure the call instruction is aligned with the I$ fetch boundary
should do that.

It's not in the SDM, but neither was our current behavior - we
were/are just relying on "it will work".

                 Linus