perf_event_intel_uncore.c build warnings on allnoconfig

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.

Quoted 10 lines · Ingo Molnar

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]

Quoted 2 lines

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.