Subject: Re: linux-next: build warnings after merge of the tip tree

From: Steven Rostedt <[email-masked]>
Date: Mon, 21 Mar 2022 12:45:51 -0400

On Mon, 21 Mar 2022 17:40:32 +0100
Peter Zijlstra <[email-masked]> wrote:

> func_B:
> 	call __fentry__	/* push func_B */
> 	...
> 	call __fexit__	/* pop 1 + tails */
> 	ret
> 
> func_A:
> 	call __fentry__ /* push func_A */
> 	...
> 	call __ftail__  /* mark func_A tail */
> 	jmp func_B
> 
> func_C:
> 	call __fentry__ /* push func_C */
> 	call func_A;
> 	...
> 	call __fexit__  /* pop 1 + tails */
> 	ret;

This also assumes that we need to trace everything that is marked. I
mentioned in another email, what do we do if we only trace funcA?

-- Steve