string_get_size_maxbuf
BUILD_BUG_ON(sizeof(exp_result10) >= string_get_size_maxbuf); \
BUILD_BUG_ON(sizeof(exp_result2) >= string_get_size_maxbuf); \
char buf10[string_get_size_maxbuf];
char buf2[string_get_size_maxbuf];
char exp10[string_get_size_maxbuf];
char exp2[string_get_size_maxbuf];