Re: [PATCH v4 15/18] static_call: Handle tail-calls

[Peter Zijlstra]

On Fri, May 01, 2020 at 10:29:04PM +0200, Peter Zijlstra wrote:
>  	if (IS_ENABLED(CONFIG_HAVE_STATIC_CALL_INLINE) && site)
> -		__static_call_transform(site, !func, func);
> +		__static_call_transform(site, 2*tail + !func, func);

I'm having trouble making that more readable though... that !func can be
exanded like proposed in 14 without code-gen changes, but:

	__static_call_transform(site, tail ? (func ? JMP : RET)
					   : (func ? CALL : NOP), func);

generates a right old mess.