[PATCH] arm64: ftrace: add missing BTIs

[Mark Brown]

On Mon, Nov 29, 2021 at 01:57:09PM +0000, Mark Rutland wrote:

> When branch target identifiers are in use, code reachable via an
> indirect branch requires a BTI landing pad at the branch target site.

Reviewed-by: Mark Brown <broonie at kernel.org>

> In future we may wish to consider adding a new SYM_CODE_START_*()
> variant which has an implicit BTI.

> +#ifdef BTI_C
> +	BTI_C
> +#endif

The ifdefs here feel ugly enough that it might be worth doing that right
now TBH.  I'm trying to think of any cases where we might also need a
BTI J but nothing springs to mind right now.
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