Re: [PATCH] printf: mark errptr() noinline

David Laight
2026-04-07T15:08:13Z

On Mon, 6 Apr 2026 12:32:32 -0400
Steven Rostedt <rostedt@goodmis.org> wrote:

> On Mon, 6 Apr 2026 11:21:39 -0400
> Tamir Duberstein <tamird@kernel.org> wrote:
>
> > Thanks Steve. IMO that is a very big hammer and not warranted in this
> > case. There's been talk of encouraging distros to enable CONFIG_KUNIT
> > by default [0], which would probably interact poorly with the change
> > you propose.
> >
>
> Branch profiling is really just a niche that is enabled specifically for
> seeing all branches taken in the kernel. It hooks to all "if" statements!
> As you can imagine, it causes a rather large overhead in performance.
>
> This option is only used by developers doing special analysis of their code
> (namely me ;-).

Is there any way to stop randconfig picking up options like these?
It is rather a waste of brain-cycles trying to fix them.
If you want the option to test a specific bit of code it is easy to
hack/disable any problematic parts.

Even having the KASAN/KMSAN code compiled into allmodconfig is a PITA
when you are trying to check that code compiles to something sensible.

David