Hi Ricardo, Thanks for the patch! Please make sure to cc our mailing list <llvm@xxxxxxxxxxxxxxx> for llvm specific issues. scripts/get_maintainer.pl should recommend it, or you can find it from clangbuiltlinux.github.io. You can also ping me internally for toolchain related issues. Start of thread. https://lore.kernel.org/lkml/20230321-kexec_clang16-v5-0-5563bf7c4173@xxxxxxxxxxxx/ On Thu, Mar 30, 2023 at 9:00 AM Borislav Petkov <bp@xxxxxxxxx> wrote: > > On Thu, Mar 30, 2023 at 11:31:27AM -0400, Steven Rostedt wrote: > > On Thu, 30 Mar 2023 17:18:26 +0200 > > Borislav Petkov <bp@xxxxxxxxx> wrote: > > > > > On Thu, Mar 30, 2023 at 11:15:23AM -0400, Steven Rostedt wrote: > > > > > Make sure that the .text section is not divided in multiple overlapping > > > > > sections. This is not supported by kexec_file. Perhaps this is related to CrOS' use of AutoFDO creating .text.hot? If so, it's probably more straightforward to straight up disable PGO for kexec. See also: commit bde971a83bbf ("KVM: arm64: nvhe: Fix build with profile optimization") > > > > > > And? > > > > > > What is the failure scenario? Why are you fixing it? Why do we care? > > > > > > This is way too laconic. > > > > > > > Yeah, I think the change log in patch 1 needs to be in this patch too, > > which gives better context. > > Just read it. > > Why did it work with clang version < 16? I'll bet if we bisect llvm, we can spot what might have changed, which may give us a clue on how to get the old behavior back; maybe without the need for a linker script. Ricardo, how did you verify that your fix was correct? Surely we can check using command line utilities without needing a full blown kexec setup? If you can share more info, I can bisect llvm quickly. If it requires profile data, you'll need to share it, since CrOS engineers still have not posted public documentation on AutoFDO as I have repeatedly asked for. > > + toolchains ML. > > -- > Regards/Gruss, > Boris. > > https://people.kernel.org/tglx/notes-about-netiquette -- Thanks, ~Nick Desaulniers _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
