Re: [PATCH stable 5.15 0/2] kbuild: Fix compilation for latest pahole release

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On Tue, Sep 06, 2022 at 02:03:30PM +0200, Greg KH wrote:
> On Mon, Sep 05, 2022 at 09:04:10AM +0200, Jiri Olsa wrote:
> > On Sun, Sep 04, 2022 at 04:10:09PM +0200, Greg KH wrote:
> > > On Sun, Sep 04, 2022 at 03:18:59PM +0200, Jiri Olsa wrote:
> > > > hi,
> > > > new version of pahole (1.24) is causing compilation fail for 5.15
> > > > stable kernel, discussed in here [1][2]. Sending fix for that plus
> > > > one dependency patch.
> > > > 
> > > > Note for patch 1:
> > > > there was one extra line change in scripts/pahole-flags.sh file in
> > > > its linux tree merge commit:
> > > > 
> > > >   fc02cb2b37fe Merge tag 'net-next-for-5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
> > > > 
> > > > not sure how/if to track that, I squashed the change in.
> > > 
> > > Squashing is fine, thanks.
> > > 
> > > And do we also need this for kernels older than 5.15?  Like 5.10 and 5.4?
> > 
> > yes, 5.10 needs similar patchset, but this for 5.15 won't apply there,
> > so I'll send it separately
> > 
> > 5.4 passes compilation, but I don't think it will boot properly, still
> > need to check on that
> > 
> > in any case, more patches are coming ;-)
> 
> Ok, these two are now queued up, feel free to send the rest when you
> have them ready.

hi,
as for 5.10 changes, I have them ready, pushed in here:
  git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git pahole_fix_5_10

but it looks like CONFIG_DEBUG_INFO_BTF is not being used in 5.10,
because I had to backport other similar option, that would break
the build even earlier (--skip_encoding_btf_vars), or people use
just old pahole ;-)

I suggest we wait with this change until somebody actually wants
this fixed, AFAICS there's no report of broken 5.10 build yet

thanks,
jirka



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