Re: [RFC PATCH] ftrace: Skip __fentry__ location of overridden weak functions

[Steven Rostedt]

On Fri, 7 Jun 2024 17:02:28 +0200
Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:

> > There may be following resolutions:  
> 
> Oh gawd, sodding weak functions again.
> 
> I would suggest changing scipts/kallsyms.c to emit readily identifiable
> symbol names for all the weak junk, eg:
> 
>   __weak_junk_NNNNN
> 
> That instantly fixes the immediate problem and Steve's horrid hack can
> go away.

Right. And when I wrote that hack, I specifically said this should be
fixed in kallsyms, and preferably at build time, as that's when the
weak functions should all be resolved.

-- Steve


> 
> Additionally, I would add a boot up pass that would INT3 fill all such
> functions and remove/invalidate all
> static_call/static_jump/fentry/alternative entry that is inside of them.