When building without CONFIG_AMD_MEM_ENCRYPT, there are several repeated instances of -Wunused-function due to missing 'inline' on the stub of hy_snp_boot_ap(): In file included from drivers/hv/hv_common.c:29: ./arch/x86/include/asm/mshyperv.h:272:12: error: 'hv_snp_boot_ap' defined but not used [-Werror=unused-function] 272 | static int hv_snp_boot_ap(int cpu, unsigned long start_ip) { return 0; } | ^~~~~~~~~~~~~~ cc1: all warnings being treated as errors Add 'inline' to fix the warnings. Fixes: 44676bb9d566 ("x86/hyperv: Add smp support for SEV-SNP guest") Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx> --- arch/x86/include/asm/mshyperv.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index 6bd9ae04d9c3..b6be267ff3d0 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -269,7 +269,7 @@ static inline void hv_ghcb_msr_read(u64 msr, u64 *value) {} static inline bool hv_ghcb_negotiate_protocol(void) { return false; } static inline void hv_ghcb_terminate(unsigned int set, unsigned int reason) {} static inline void hv_vtom_init(void) {} -static int hv_snp_boot_ap(int cpu, unsigned long start_ip) { return 0; } +static inline int hv_snp_boot_ap(int cpu, unsigned long start_ip) { return 0; } #endif extern bool hv_isolation_type_snp(void); --- base-commit: bb9b0e46b84c19d3dd7d453a2da71a0fdc172b31 change-id: 20230822-hv_snp_boot_ap-missing-inline-205e615e4fe6 Best regards, -- Nathan Chancellor <nathan@xxxxxxxxxx>