nathanchance added a comment. In D110869#3295012 <https://reviews.llvm.org/D110869#3295012>, @void wrote:
> 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); > } I tested this patch but it did not change the hang. 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
