[PATCH v7] powerpc/irq: Inline call_do_irq() and call_do_softirq()

[Nick Desaulniers]

On Fri, Apr 30, 2021 at 2:33 PM Nick Desaulniers
<ndesaulniers at google.com> wrote:
>
> On Tue, Apr 27, 2021 at 1:42 PM Nick Desaulniers
> <ndesaulniers at google.com> wrote:
> >
> > On Mon, Apr 26, 2021 at 11:39 PM Christophe Leroy
> > <christophe.leroy at csgroup.eu> wrote:
> > >
> > > As you can see, CLANG doesn't save/restore 'lr' allthought 'lr' is explicitely listed in the
> > > registers clobbered by the inline assembly:
> >
> > Ah, thanks for debugging this. Will follow up in
> > https://bugs.llvm.org/show_bug.cgi?id=50147.
>
> Looks like there's a fix posted for LLVM in: https://reviews.llvm.org/D101657
>
> Though trying to test it in QEMU, I'm hitting some assertion failure
> booting a kernel (even without that patch to LLVM):
> qemu-system-ppc: ../../hw/pci/pci.c:253: pci_bus_change_irq_level:
> Assertion `irq_num >= 0' failed.
> That's with
> QEMU emulator version 5.2.0 (Debian 1:5.2+dfsg-9)
>
> I didn't see anything in https://bugs.launchpad.net/qemu/ about it,
> but figured I'd share in case that assertion failure looked familiar
> to anyone.

Nathan pointed out some previous reports; looks like others are
hitting this, too:
https://github.com/ClangBuiltLinux/linux/issues/1345#issuecomment-830451276


-- 
Thanks,
~Nick Desaulniers