Re: [PATCH 1/3] Revert "x86/ftrace: Use alternative RET encoding"

[Greg KH <gregkh@linuxfoundation.org>]

On Tue, Aug 16, 2022 at 07:16:25AM -0300, Thadeu Lima de Souza Cascardo wrote:
> On Tue, Aug 16, 2022 at 11:18:52AM +0200, Greg KH wrote:
> > On Tue, Aug 16, 2022 at 05:26:56AM -0300, Thadeu Lima de Souza Cascardo wrote:
> > > This reverts commit 3af2ebf798c52b20de827b9dfec13472ab4a7964.
> > > 
> > > This temporarily reverts the backport of upstream commit
> > > 1f001e9da6bbf482311e45e48f53c2bd2179e59c. It was not correct to copy the
> > > ftrace stub as it would contain a relative jump to the return thunk which
> > > would not apply to the context where it was being copied to, leading to
> > > ftrace support to be broken.
> > > 
> > > Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
> > > ---
> > >  arch/x86/kernel/ftrace.c | 7 ++-----
> > >  1 file changed, 2 insertions(+), 5 deletions(-)
> > 
> > What stable tree(s) is this to be for?
> > 
> > Context is everything :)
> > 
> > thanks,
> > 
> > greg k-h
> 
> Yeah, I was just thinking that I missed it, and whether I would be able to
> respond to my own message before you did.  :-)
> 
> This series is targed at 5.15. I will look at 5.10 next.

Thanks, I'll queue this up after the current 5.15-rc is released later
this week.

greg k-h