Messages in this thread | | | From | Nick Desaulniers <> | Date | Thu, 25 Feb 2021 13:15:18 -0800 | Subject | Re: [kbuild-all] Re: WARNING: modpost: vmlinux.o(.text+0x1a8edb8): Section mismatch in reference from the function stop_machine() to the function .init.text:intel_rng_hw_init() |
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On Thu, Feb 25, 2021 at 10:34 AM Nathan Chancellor <nathan@kernel.org> wrote: > > On Thu, Feb 25, 2021 at 04:17:21PM +0800, Rong Chen wrote: > > > > > > On 2/24/21 10:26 PM, Jürgen Groß wrote: > > > On 24.02.21 15:20, kernel test robot wrote: > > > > tree: > > > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > > > > master > > > > head: c03c21ba6f4e95e406a1a7b4c34ef334b977c194 > > > > commit: ab234a260b1f625b26cbefa93ca365b0ae66df33 x86/pv: Rework > > > > arch_local_irq_restore() to not use popf > > > > date: 2 weeks ago > > > > config: x86_64-randconfig-a005-20210223 (attached as .config) > > > > compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project > > > > f14a14dd2564703db02f80c00db8ae492b594f77) > > > > reproduce (this is a W=1 build): > > > > wget > > > > https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross > > > > -O ~/bin/make.cross > > > > chmod +x ~/bin/make.cross > > > > # install x86_64 cross compiling tool for clang build > > > > # apt-get install binutils-x86-64-linux-gnu > > > > # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ab234a260b1f625b26cbefa93ca365b0ae66df33 > > > > git remote add linus > > > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > > > > git fetch --no-tags linus master > > > > git checkout ab234a260b1f625b26cbefa93ca365b0ae66df33 > > > > # save the attached .config to linux build tree > > > > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross > > > > ARCH=x86_64 > > > > > > > > If you fix the issue, kindly add following tag as appropriate > > > > Reported-by: kernel test robot <lkp@intel.com> > > > > > > > > All warnings (new ones prefixed by >>, old ones prefixed by <<): > > > > > > > > > > WARNING: modpost: vmlinux.o(.text+0x1a8edb8): Section > > > > > > mismatch in reference from the function stop_machine() to > > > > > > the function .init.text:intel_rng_hw_init() > > > > The function stop_machine() references > > > > the function __init intel_rng_hw_init(). > > > > This is often because stop_machine lacks a __init > > > > annotation or the annotation of intel_rng_hw_init is wrong. > > > > > > I'd be very interested to know how the identified patch would be able to > > > have this effect.
Sorry, this looks like fallout from a recent LLVM change, see also: https://lore.kernel.org/lkml/CAKwvOd=B=cHpp_XfPTtyVpQyrwQrFZX9SXKw=SJC1VC-VbEwFA@mail.gmail.com/
> > > > Hi Clang Team, > > > > The problem is found by the latest clang, and I can't reproduce it with > > clang-11, > > could you take a look? > > > > Best Regards, > > Rong Chen > > Hi Rong, > > Known issue. LLVM 13 cut over to the new pass manager (NPM) which has > changed some of the inlining heuristics. I would probably recommend > cutting over to the "release/12.x" branch for now, which should be more
ehh...we still want coverage of ToT LLVM though, to spot potential issues like this. I'd take both (clang-12 and 13) if possible; both are pre-release and still undergoing active development.
> up to date but also stable. > > Additionally, Arnd sent a fix for this particular warning here: > https://lore.kernel.org/lkml/20210225130153.1956990-1-arnd@kernel.org/
Looks like it got picked up by akpm@ in -mm?
> > Cheers, > Nathan
-- Thanks, ~Nick Desaulniers
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