On Wed, Dec 1, 2021 at 3:20 AM Coiby Xu <coxu@xxxxxxxxxx> wrote: > > On Wed, Nov 24, 2021 at 09:47:43PM +0800, Baoquan He wrote: > >On 11/24/21 at 01:47pm, Veronika Kabatova wrote: > >> Hi, > >> > >> for a while we've been seen the following error when compiling > >> the mainline kernel with gcc 11.2 and binutils 2.37: > >> > >> 00:02:32 Cannot find symbol for section 11: .text.unlikely. > >> 00:02:32 kernel/kexec_file.o: failed > >> 00:02:32 make[3]: *** [scripts/Makefile.build:287: kernel/kexec_file.o] Error 1 > >> 00:02:32 make[3]: *** Deleting file 'kernel/kexec_file.o' > >> 00:02:32 make[2]: *** [Makefile:1846: kernel] Error 2 > >> 00:02:32 make[2]: *** Waiting for unfinished jobs.... > >> > >> The error only happens with ppc64le. I've tested this with cross > >> compilation, but the only reference to the error I found suggests > >> the same happens with the native compiles as well: > >> > >> https://github.com/groeck/linux-build-test/commit/142cbefbc0d37962c9a6c7f28ee415ecd5fd1e98 > >> > >> In case it matters, the config used is the Fedora config with > >> kselftest options enabled, which you can grab from > >> > >> https://gitlab.com/redhat/red-hat-ci-tools/kernel/cki-internal-pipelines/cki-trusted-contributors/-/jobs/1760752896/artifacts/raw/artifacts/kernel-mainline.kernel.org-ppc64le-e4e737bb5c170df6135a127739a9e6148ee3da82.config > >> > >> > >> I've reached out to the Fedora compiler folks and Nick Clifton > >> suggested this is a problem with the kernel: > >> > >> This message comes from the recordmcount tool, which is part of the kernel > >> sources: > >> > >> linux/scripts/recordmcount.[ch] > >> > >> It appears to be triggered when a compiler update causes code to be > >> rearranged. The problem has been reported before in various forums, > >> but in particular I found this reference: > >> > >> https://lore.kernel.org/lkml/20201204165742.3815221-2-arnd@xxxxxxxxxx/ > >> > >> The point of which to me at least is that this is a kernel issue rather than > >> a compiler issue. Ie there must be some weak symbols in kexec_file.o file > >> which need to be moved elsewhere. > > > >It could be arch_kexec_kernel_verify_sig() in kernel/kexec_file.c which > >is __weak, but not implemented in any ARCH. If true, this has been > >pointed out by Eric in one patch thread from Coiby. > > > >[PATCH v3 1/3] kexec: clean up arch_kexec_kernel_verify_sig > >http://lkml.kernel.org/r/20211018083137.338757-2-coxu@xxxxxxxxxx > > > >Maybe Coiby can fetch above config file and run the test to check. > > "[PATCH v3 1/3] kexec: clean up arch_kexec_kernel_verify_sig" alone > would fix the error. If I turn arch_kexec_apply_relocations{_add,} into > static function, the error would be gone. As attached is the patch would > make this error disappear. > Thank you! I can confirm the attached patch fixes the problem. Veronika > However, s390 and x86 have its own implementation of > arch_kexec_apply_relocations_add. This makes it looks like to be gcc's > issue. > > > > > >Thanks > >Baoquan > > > > -- > Best regards, > Coiby _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
