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    Subject[PATCH 5.16 0404/1039] x86, sched: Fix undefined reference to init_freq_invariance_cppc() build error
    Date
    From: Huang Rui <ray.huang@amd.com>

    [ Upstream commit 6c4ab1b86dac3954d15c00c1a6396d60a1023fab ]

    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@infradead.org/.

    Fixes: 41ea667227ba ("x86, sched: Calculate frequency invariance for AMD systems")
    Reported-by: kernel test robot <lkp@intel.com>
    Reported-by: Randy Dunlap <rdunlap@infradead.org>
    Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
    Signed-off-by: Huang Rui <ray.huang@amd.com>
    [ rjw: Subject edits ]
    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    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 cc164777e6619..2f0b6be8eaabc 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
    --
    2.34.1


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