Passing structure to openCL Kernel

I want to pass a structure to opencl kernel, the structure is

struct test
{
    int *x;
    float *y;
    char *z;
};

and the memory allocation and initialization is like

    struct test t;
t.x = (int*)malloc(sizeof(int)*100);
t.y = (float*) malloc (sizeof(float)*50);
t.z = (char*) malloc (sizeof(char) *25);
  for(i = 0;i<100;i++)
  {
      t.x[i] = i;
      if(i<50)
          {
              t.y[i] = i;
          if(i<25)
              t.z[i] = 'a';
          }
  }

can i pass such a structure to opencl kernel

You can pass such a structure, but it will be pointless because x, y and z point to different memory regions. Each of these memory buffers must be transferred on its own.