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Date: Tue, 17 May 2022 13:28:44 +0530 From: "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com> To: Eric Biederman <ebiederm@...ssion.com>, Michael Ellerman <mpe@...erman.id.au> Cc: kexec@...ts.infradead.org, linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org Subject: Re: [PATCH] kexec_file: Drop pr_err in weak implementations of arch_kexec_apply_relocations[_add] Naveen N. Rao wrote: > kexec_load_purgatory() can fail for many reasons - there is no need to > print an error when encountering unsupported relocations. > > This solves a build issue on powerpc with binutils v2.36 and newer [1]. > Since commit d1bcae833b32f1 ("ELF: Don't generate unused section > symbols") [2], binutils started dropping section symbols that it thought > were unused. This isn't an issue in general, but with kexec_file.c, gcc > is placing kexec_arch_apply_relocations[_add] into a separate > .text.unlikely section and the section symbol ".text.unlikely" is being > dropped. Due to this, recordmcount is unable to find a non-weak symbol > in .text.unlikely to generate a relocation record against. Dropping > pr_err() calls results in these functions being left in .text section, > enabling recordmcount to emit a proper relocation record. > > [1] https://github.com/linuxppc/issues/issues/388 > [2] https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=d1bcae833b32f1 > > Signed-off-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com> > --- > kernel/kexec_file.c | 2 -- > 1 file changed, 2 deletions(-) Eric, Any comments on this? There have been many reports of build breakages due to this. FWIW, there have been similar fixes in the past: - https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/init/initramfs.c?id=55d5b7dd6451b58489ce384282ca5a4a289eb8d5 - https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/include/linux/elfcore.h?id=6e7b64b9dd6d96537d816ea07ec26b7dedd397b9 - Naveen
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