Re: [patch V4 part 2 12/18] x86,objtool: Make entry_64_compat.S objtool clean

[Andy Lutomirski]

On Tue, May 5, 2020 at 7:14 AM Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
>
> Currently entry_64_compat is exempt from objtool, but with vmlinux
> mode there is no hiding it.
>
> Make the following changes to make it pass:
>
>  - change entry_SYSENTER_compat to STT_NOTYPE; it's not a function
>    and doesn't have function type stack setup.
>
>  - mark all STT_NOTYPE symbols with UNWIND_HINT_EMPTY; so we do
>    validate them and don't treat them as unreachable.
>
>  - don't abuse RSP as a temp register, this confuses objtool
>    mightily as it (rightfully) thinks we're doing unspeakable
>    things to the stack.
>

Acked-by: Andy Lutomirski <luto@xxxxxxxxxx>

> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>

Did a From line get eaten?