Re: [RFC PATCH] ARM: UNWINDER_FRAME_POINTER implementation for Clang

[Nathan Huckleberry]

I'm not sure that we should disable a broken feature instead of
attempting a fix.

CONFIG_FUNCTION_GRAPH_TRACER is dependent on CONFIG_FRAME_POINTER and
there have been reports by MediaTek that the frame pointer unwinder is
faster in some cases.

On Mon, Aug 5, 2019 at 6:39 AM Dave Martin <Dave.Martin@xxxxxxx> wrote:
>
> On Fri, Aug 02, 2019 at 10:27:30AM -0700, Nathan Huckleberry wrote:
> > You're right. Would pushing an extra register be an adequate fix?
>
> Would forcing CONFIG_ARM_UNWIND=y for clang work as an alternative to
> this?
>
> Assuming clang supports -funwind-tables or equivalent, this may just
> work.
>
> [...]
>
> Cheers
> ---Dave