Re: [RFC][PATCH v2] ftrace/x86: Emulate call function while updating in breakpoint handler

From: Linus Torvalds
Date: Tue Apr 30 2019 - 22:03:47 EST


On Tue, Apr 30, 2019 at 6:35 PM Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
>
>
> Probably easier to move it from inline asm to ftrace_X.S and use the
> lockdep TRACE_ON/OFF macros.

Yeah, that should clean up the percpu stuff too since we have helper
macros for it for *.S files anyway.

I only did the asm() in C because it made the "look, something like
this" patch simpler to test (and it made it easy to check the
generated asm file). Not because it was a good idea ;)

Linus