The init_freq_invariance_cppc function is implemented in smpboot and depends on CONFIG_SMP. MODPOST vmlinux.symvers MODINFO modules.builtin.modinfo GEN modules.builtin LD .tmp_vmlinux.kallsyms1 ld: drivers/acpi/cppc_acpi.o: in function `acpi_cppc_processor_probe': /home/ray/brahma3/linux/drivers/acpi/cppc_acpi.c:819: undefined reference to `init_freq_invariance_cppc' make: *** [Makefile:1161: vmlinux] Error 1 See https://lore.kernel.org/lkml/484af487-7511-647e-5c5b-33d4429acdec@xxxxxxxxxxxxx/. Fixes: 41ea667227ba ("x86, sched: Calculate frequency invariance for AMD systems") Reported-by: kernel test robot <lkp@xxxxxxxxx> Reported-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx> Reported-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> Signed-off-by: Huang Rui <ray.huang@xxxxxxx> Cc: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Cc: Borislav Petkov <bp@xxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: x86@xxxxxxxxxx Cc: stable@xxxxxxxxxxxxxxx --- arch/x86/include/asm/topology.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h index cc164777e661..2f0b6be8eaab 100644 --- a/arch/x86/include/asm/topology.h +++ b/arch/x86/include/asm/topology.h @@ -221,7 +221,7 @@ static inline void arch_set_max_freq_ratio(bool turbo_disabled) } #endif -#ifdef CONFIG_ACPI_CPPC_LIB +#if defined(CONFIG_ACPI_CPPC_LIB) && defined(CONFIG_SMP) void init_freq_invariance_cppc(void); #define init_freq_invariance_cppc init_freq_invariance_cppc #endif -- 2.25.1
