If variable is of Type, use printk format specifier:
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char %d or %x
unsigned char %u or %x
short int %d or %x
unsigned short int %u or %x
int %d or %x
unsigned int %u or %x
long %ld or %lx
unsigned long %lu or %lx
long long %lld or %llx
unsigned long long %llu or %llx
size_t %zu or %zx
ssize_t %zd or %zx
s8 %d or %x
u8 %u or %x
s16 %d or %x
u16 %u or %x
s32 %d or %x
u32 %u or %x
s64 %lld or %llx
u64 %llu or %llx
注意：内核的 printk 不支持 %n、浮点格式（%e、%f、%g、%a）
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