Re: [PATCH v12 00/14] unwind_user: x86: Deferred unwinding infrastructure

[Kees Cook]

On Mon, Jun 30, 2025 at 10:45:39PM -0400, Steven Rostedt wrote:
> On Mon, 30 Jun 2025 19:06:12 -0700
> Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> 
> > On Mon, 30 Jun 2025 at 17:54, Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
> > >
> > > This is the first patch series of a set that will make it possible to be able
> > > to use SFrames[1] in the Linux kernel. A quick recap of the motivation for
> > > doing this.  
> > 
> > You have a '[1]' to indicate there's a link to what SFrames are.
> [...]
>   [1] https://sourceware.org/binutils/wiki/sframe

Okay, I've read the cover letter and this wiki page, but I am dense: why
does the _kernel_ want to do this? Shouldn't it only be userspace that
cares about userspace unwinding? I don't use perf, ftrace, and ebpf
enough to make this obvious to me, I guess. ;)

-- 
Kees Cook