Re: [PATCH v2] kernel.h: handle pointers to arrays better in container_of()

[Peter Zijlstra]

On Tue, May 23, 2017 at 11:32:02AM +0100, Ian Abbott wrote:

> > #define container_of(ptr, type, member) (				\
> > 	_Static_assert(__builtin_types_compatible_p(			\
> >             typeof(*ptr), typeof( ((type *)0)->member )), "WUT"),	\
> > 	((type *)((char *)(ptr) - offsetof(type, member)));		\
> > )
> 
> It's a fine suggestion (if more parentheses are added), but _Static_assert
> is a C11 feature, and I thought the kernel was using gnu89 (unless it's been
> updated since).

We have BUILD_BUG_ON() that should be similar in functionality.