RE: [kbuild-all] [pci:pci/resource 5/8] drivers/pci/of.o: warning: objtool: of_pci_map_rid.cold.1()+0x20: call without frame pointer save/setup

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> 
> On 2018-05-29 19:09, kbuild test robot wrote:
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git pci/resource
> > head:   ae5dab4220cf9ef3e7ecd6d520ab3a5750bb0eb6
> > commit: bdf501f350aaa3432e4c85d4f8f57f6aa7bc9c1d [5/8] PCI: Use
> dev_printk() in of_pci_get_host_bridge_resources()
> > config: x86_64-randconfig-x004-201821 (attached as .config)
> > compiler: gcc-8 (Debian 8.1.0-3) 8.1.0
> > reproduce:
> >         git checkout bdf501f350aaa3432e4c85d4f8f57f6aa7bc9c1d
> >         # save the attached .config to linux build tree
> >         make ARCH=x86_64
> >
> > All warnings (new ones prefixed by >>):
> >
> >    drivers/pci/of.o: warning: objtool: of_pci_check_probe_only()+0x8e: sibling
> call from callable instruction with modified stack frame
> >    drivers/pci/of.o: warning: objtool: of_pci_map_rid()+0x134: sibling call from
> callable instruction with modified stack frame
> >    drivers/pci/of.o: warning: objtool: of_irq_parse_and_map_pci()+0x1f8: sibling
> call from callable instruction with modified stack frame
> >    drivers/pci/of.o: warning: objtool: of_pci_check_probe_only.cold.0()+0x17: call
> without frame pointer save/setup
> >>> drivers/pci/of.o: warning: objtool: of_pci_map_rid.cold.1()+0x20: call without
> frame pointer save/setup
> >    drivers/pci/of.o: warning: objtool: of_irq_parse_and_map_pci.cold.2()+0x15:
> call without frame pointer save/setup
> >
> 
> Can someone enlighten me what that means? And I don't see how this patch
> could directly contribute to it.
Hi Jan, allow us to double check this since we upgrade gcc to 8.1 which may bring
some different warnings/issues. You can kindly ignore this for now.

> 
> Thanks,
> Jan
> 
> --
> Siemens AG, Corporate Technology, CT RDA IOT SES-DE
> Corporate Competence Center Embedded Linux
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