使用GCC4.8 编译android内核提示warning: argument to ‘sizeof’ in ‘void* memset(void*, int, size_t)’

warning: argument to ‘sizeof’ in ‘void* memset(void*, int, size_t)’ call is the same expression as the destination; did you mean to dereference it? [-Wsizeof-pointer-memaccess]

#include <string.h>

struct A { };

int main(void)
{
A obj;
A* p1 = &obj;
A p2[10];

memset(p1, 0, sizeof(p1)); // error
memset(p1, 0, sizeof(*p1)); // ok, dereferenced
memset(p2, 0, sizeof(p2)); // ok, array

return 0;
}