Re: [PATCH 5.15 00/72] 5.15.13-rc2 review

[Shuah Khan]

On 1/5/22 7:56 AM, Greg Kroah-Hartman wrote:
> On Wed, Jan 05, 2022 at 06:32:43PM +0530, Jeffrin Jose T wrote:
> > On Tue, 2022-01-04 at 08:41 +0100, Greg Kroah-Hartman wrote:
> > > This is the start of the stable review cycle for the 5.15.13 release.
> > > There are 72 patches in this series, all will be posted as a response
> > > to this one.  If anyone has any issues with these being applied, please
> > > let me know.
> > >
> > > Responses should be made by Thu, 06 Jan 2022 07:38:29 +0000.
> > > Anything received after that time might be too late.
> > >
> > > The whole patch series can be found in one patch at:
> > >          
> > > https://www.kernel.org/pub/linux/kernel/v5.x/stable-review/patch-5.15.13-rc2.gz
> > > or in the git tree and branch at:
> > >          git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-
> > > stable-rc.git linux-5.15.y
> > > and the diffstat can be found below.
> > >
> > > thanks,
> > >
> > > greg k-h
> >   hello,
> >
> > There was a compilation error....
> >
> > -----------x--------------x------------------x--
> > MODPOST vmlinux.symvers
> >    MODINFO modules.builtin.modinfo
> >    GEN     modules.builtin
> > BTF: .tmp_vmlinux.btf: pahole (pahole) is not available
> > Failed to generate BTF for vmlinux
> > Try to disable CONFIG_DEBUG_INFO_BTF
> > make: *** [Makefile:1183: vmlinux] Error 1
>
> Is this a regression?  If so, what commit caused this?
>
> > i did CONFIG_DEBUG_INFO_BTF=n  in .config and then compilation was
> > success.
>
> Or you can install pahole, right?  That's a requirement for that build
> option I think.

Looks like some distros enabled this option - either disable the
option or install pahole. Not a regression.

Keep in mind that CONFIG_DEBUG_INFO_BTF is a dependency to build
bpf tests. bpf build pulls kernel defines from BTF to generate a
header file. Not desirable to generate header that conflicts with
standard libgcc defines which is not relevant to this conversation.

thanks,
-- Shuah