Re: [RFC PATCH 1/2] x86: Fix rbp saving in pt_regs on irq entry

Frederic Weisbecker
2011-01-07T16:33:55Z

On Fri, Jan 07, 2011 at 04:13:58PM +0000, Jan Beulich wrote:
> >>> On 07.01.11 at 17:05, Frederic Weisbecker <fweisbec@gmail.com> wrote:
> > Once I'll have perf callchain based on CFI ready, we'll perhaps find some
> > issues
> > there. Although I guess there are already tools that can make use of that.
>
> Is this to read that you're planning to do a re-spin of the CFI
> unwinding code (which I'm not allowed to submit another time,
> but which we've been using for years in SuSE distros) then?

Actually I couldn't test kernel CFI annotations with perf as we
keep the kernel unwinding under frame pointer style.

The CFI unwinding we'll do is only for userspace.