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. Thanks Baoquan _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
