3373 gcc >= 4.5 concerns about offsetof()

*** 368,378 ****
--- 368,382 ----
  
  /* avoid any possibility of clashing with <stddef.h> version */
  #if defined(_KERNEL) && !defined(_KMEMUSER)
  
  #if !defined(offsetof)
+ #if defined(__GNUC__)
+ #define offsetof(s, m)  __builtin_offsetof(s, m)
+ #else
  #define offsetof(s, m)  ((size_t)(&(((s *)0)->m)))
+ #endif
  #endif /* !offsetof */
  
  #define container_of(m, s, name)                        \
          (void *)((uintptr_t)(m) - (uintptr_t)offsetof(s, name))