void added a comment. In D110869#3294696 <https://reviews.llvm.org/D110869#3294696>, @nathanchance wrote:
> This diff allows me to boot on bare metal as of v5.17-rc2: > > diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile > index 6aef9ee28a39..8ee176dac669 100644 > --- a/arch/x86/kernel/Makefile > +++ b/arch/x86/kernel/Makefile > @@ -125,6 +125,7 @@ obj-$(CONFIG_DEBUG_NMI_SELFTEST) += nmi_selftest.o > > obj-$(CONFIG_KVM_GUEST) += kvm.o kvmclock.o > obj-$(CONFIG_PARAVIRT) += paravirt.o > +CFLAGS_paravirt.o += -fzero-call-used-regs=skip > obj-$(CONFIG_PARAVIRT_SPINLOCKS)+= paravirt-spinlocks.o > obj-$(CONFIG_PARAVIRT_CLOCK) += pvclock.o > obj-$(CONFIG_X86_PMEM_LEGACY_DEVICE) += pmem.o > > I have uploaded the config used, the preprocessed file, and the "good" object > (with the following diff) and the "bad" object (without the above diff) here: > https://github.com/nathanchance/bug-files/tree/052a31e6d94c1b349cf6f3128087944444dace24/D110869 > > If there is any more information I can give, please let me know! Thanks for the information! Could you test this patch for me? (Applied over the patch in this review.) diff --git a/llvm/lib/CodeGen/PrologEpilogInserter.cpp b/llvm/lib/CodeGen/PrologEpilogInserter.cpp index 968a14548813..46ae48bd6a3c 100644 --- a/llvm/lib/CodeGen/PrologEpilogInserter.cpp +++ b/llvm/lib/CodeGen/PrologEpilogInserter.cpp @@ -1217,7 +1217,8 @@ void PEI::insertZeroCallUsedRegs(MachineFunction &MF) { continue; MCRegister Reg = MO.getReg(); - if ((MO.isDef() || MO.isUse()) && AllocatableSet[Reg]) + if (AllocatableSet[Reg] && !MO.isImplicit() && + (MO.isDef() || MO.isUse())) UsedRegs.set(Reg); } Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D110869/new/ https://reviews.llvm.org/D110869 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
