The default type of a decimal constant is determined by the magnitude of its value. If the value falls within the range of int, its type is int; otherwise, if it falls within the range of unsigned int, its type is unsigned int. This results in the constant 48 being of type int. In the following min call, g_phys_as = min(g_phys_as, 48); This leads to a building warning/error (CONFIG_KVM_WERROR=y) caused by the mismatch between the types of the two arguments to macro min. By adding the suffix U to explicitly declare the type of the constant, this issue is fixed. Signed-off-by: Ethan Zhao <haifeng.zhao@xxxxxxxxxxxxxxx> --- arch/x86/kvm/cpuid.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 2cbb3874ad39..aa2c319118bc 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -1704,7 +1704,7 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function) phys_as = entry->eax & 0xff; g_phys_as = phys_as; if (kvm_mmu_get_max_tdp_level() < 5) - g_phys_as = min(g_phys_as, 48); + g_phys_as = min(g_phys_as, 48U); } entry->eax = phys_as | (virt_as << 8) | (g_phys_as << 16); -- 2.31.1
