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SubjectRe: [patch V4 part 2 12/18] x86,objtool: Make entry_64_compat.S objtool clean
On Tue, May 5, 2020 at 7:14 AM Thomas Gleixner <tglx@linutronix.de> 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@kernel.org>

> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>

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