* Andi Kleen <a...@firstfloor.org> wrote:
> Ingo Molnar <mi...@kernel.org> writes:
>
> > FYI, on a 'make allnoconfig' x86_64 kernel I get a stream of
> > warnings:
> >
> > arch/x86/kernel/cpu/perf_event_intel_uncore.c: In function
> > ???snbep_uncore_pci_disable_box???:
> > arch/x86/kernel/cpu/perf_event_intel_uncore.c:124:9: warning: ???config???
> > is used uninitialized in this function [-Wuninitialized]
> > arch/x86/kernel/cpu/perf_event_intel_uncore.c: In function
> > ???snbep_uncore_pci_enable_box???:
> > arch/x86/kernel/cpu/perf_event_intel_uncore.c:135:9: warning: ???config???
> > is used uninitialized in this function [-Wuninitialized]
> > arch/x86/kernel/cpu/perf_event_intel_uncore.c: In function
> > ???snbep_uncore_pci_read_counter???:
> > arch/x86/kernel/cpu/perf_event_intel_uncore.c:164:2: warning: ???count???
> > is used uninitialized in this function [-Wuninitialized]
> >
> > Please fix this - if pci_read_config_dword() returns an error it
> > should be handled - that will fix these warnings as well.
>
> Can it even return an error on x86? I don't know of any
> existing mechanism for this, short of a machine check.
It will return an error on !CONFIG_PCI at least.
Thanks,
Ingo
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